diff options
Diffstat (limited to 'Documentation/ABI')
| -rw-r--r-- | Documentation/ABI/obsolete/dv1394 | 9 | ||||
| -rw-r--r-- | Documentation/ABI/obsolete/proc-pid-oom_adj | 22 | ||||
| -rw-r--r-- | Documentation/ABI/removed/dv1394 | 14 | ||||
| -rw-r--r-- | Documentation/ABI/removed/raw1394 | 15 | ||||
| -rw-r--r-- | Documentation/ABI/removed/raw1394_legacy_isochronous | 16 | ||||
| -rw-r--r-- | Documentation/ABI/removed/video1394 | 16 | ||||
| -rw-r--r-- | Documentation/ABI/testing/sysfs-ata | 99 | ||||
| -rw-r--r-- | Documentation/ABI/testing/sysfs-block-zram | 99 | ||||
| -rw-r--r-- | Documentation/ABI/testing/sysfs-devices-power | 88 | ||||
| -rw-r--r-- | Documentation/ABI/testing/sysfs-devices-system-ibm-rtl | 22 | ||||
| -rw-r--r-- | Documentation/ABI/testing/sysfs-driver-hid-roccat-pyra | 98 | ||||
| -rw-r--r-- | Documentation/ABI/testing/sysfs-module | 12 | ||||
| -rw-r--r-- | Documentation/ABI/testing/sysfs-power | 29 |
13 files changed, 514 insertions, 25 deletions
diff --git a/Documentation/ABI/obsolete/dv1394 b/Documentation/ABI/obsolete/dv1394 deleted file mode 100644 index 2ee36864ca10..000000000000 --- a/Documentation/ABI/obsolete/dv1394 +++ /dev/null @@ -1,9 +0,0 @@ -What: dv1394 (a.k.a. "OHCI-DV I/O support" for FireWire) -Contact: linux1394-devel@lists.sourceforge.net -Description: - New application development should use raw1394 + userspace libraries - instead, notably libiec61883 which is functionally equivalent. - -Users: - ffmpeg/libavformat (used by a variety of media players) - dvgrab v1.x (replaced by dvgrab2 on top of raw1394 and resp. libraries) diff --git a/Documentation/ABI/obsolete/proc-pid-oom_adj b/Documentation/ABI/obsolete/proc-pid-oom_adj new file mode 100644 index 000000000000..cf63f264ce0f --- /dev/null +++ b/Documentation/ABI/obsolete/proc-pid-oom_adj @@ -0,0 +1,22 @@ +What: /proc/<pid>/oom_adj +When: August 2012 +Why: /proc/<pid>/oom_adj allows userspace to influence the oom killer's + badness heuristic used to determine which task to kill when the kernel + is out of memory. + + The badness heuristic has since been rewritten since the introduction of + this tunable such that its meaning is deprecated. The value was + implemented as a bitshift on a score generated by the badness() + function that did not have any precise units of measure. With the + rewrite, the score is given as a proportion of available memory to the + task allocating pages, so using a bitshift which grows the score + exponentially is, thus, impossible to tune with fine granularity. + + A much more powerful interface, /proc/<pid>/oom_score_adj, was + introduced with the oom killer rewrite that allows users to increase or + decrease the badness() score linearly. This interface will replace + /proc/<pid>/oom_adj. + + A warning will be emitted to the kernel log if an application uses this + deprecated interface. After it is printed once, future warnings will be + suppressed until the kernel is rebooted. diff --git a/Documentation/ABI/removed/dv1394 b/Documentation/ABI/removed/dv1394 new file mode 100644 index 000000000000..c2310b6676f4 --- /dev/null +++ b/Documentation/ABI/removed/dv1394 @@ -0,0 +1,14 @@ +What: dv1394 (a.k.a. "OHCI-DV I/O support" for FireWire) +Date: May 2010 (scheduled), finally removed in kernel v2.6.37 +Contact: linux1394-devel@lists.sourceforge.net +Description: + /dev/dv1394/* were character device files, one for each FireWire + controller and for NTSC and PAL respectively, from which DV data + could be received by read() or transmitted by write(). A few + ioctl()s allowed limited control. + This special-purpose interface has been superseded by libraw1394 + + libiec61883 which are functionally equivalent, support HDV, and + transparently work on top of the newer firewire kernel drivers. + +Users: + ffmpeg/libavformat (if configured for DV1394) diff --git a/Documentation/ABI/removed/raw1394 b/Documentation/ABI/removed/raw1394 new file mode 100644 index 000000000000..490aa1efc4ae --- /dev/null +++ b/Documentation/ABI/removed/raw1394 @@ -0,0 +1,15 @@ +What: raw1394 (a.k.a. "Raw IEEE1394 I/O support" for FireWire) +Date: May 2010 (scheduled), finally removed in kernel v2.6.37 +Contact: linux1394-devel@lists.sourceforge.net +Description: + /dev/raw1394 was a character device file that allowed low-level + access to FireWire buses. Its major drawbacks were its inability + to implement sensible device security policies, and its low level + of abstraction that required userspace clients do duplicate much + of the kernel's ieee1394 core functionality. + Replaced by /dev/fw*, i.e. the <linux/firewire-cdev.h> ABI of + firewire-core. + +Users: + libraw1394 (works with firewire-cdev too, transparent to library ABI + users) diff --git a/Documentation/ABI/removed/raw1394_legacy_isochronous b/Documentation/ABI/removed/raw1394_legacy_isochronous deleted file mode 100644 index 1b629622d883..000000000000 --- a/Documentation/ABI/removed/raw1394_legacy_isochronous +++ /dev/null @@ -1,16 +0,0 @@ -What: legacy isochronous ABI of raw1394 (1st generation iso ABI) -Date: June 2007 (scheduled), removed in kernel v2.6.23 -Contact: linux1394-devel@lists.sourceforge.net -Description: - The two request types RAW1394_REQ_ISO_SEND, RAW1394_REQ_ISO_LISTEN have - been deprecated for quite some time. They are very inefficient as they - come with high interrupt load and several layers of callbacks for each - packet. Because of these deficiencies, the video1394 and dv1394 drivers - and the 3rd-generation isochronous ABI in raw1394 (rawiso) were created. - -Users: - libraw1394 users via the long deprecated API raw1394_iso_write, - raw1394_start_iso_write, raw1394_start_iso_rcv, raw1394_stop_iso_rcv - - libdc1394, which optionally uses these old libraw1394 calls - alternatively to the more efficient video1394 ABI diff --git a/Documentation/ABI/removed/video1394 b/Documentation/ABI/removed/video1394 new file mode 100644 index 000000000000..c39c25aee77b --- /dev/null +++ b/Documentation/ABI/removed/video1394 @@ -0,0 +1,16 @@ +What: video1394 (a.k.a. "OHCI-1394 Video support" for FireWire) +Date: May 2010 (scheduled), finally removed in kernel v2.6.37 +Contact: linux1394-devel@lists.sourceforge.net +Description: + /dev/video1394/* were character device files, one for each FireWire + controller, which were used for isochronous I/O. It was added as an + alternative to raw1394's isochronous I/O functionality which had + performance issues in its first generation. Any video1394 user had + to use raw1394 + libraw1394 too because video1394 did not provide + asynchronous I/O for device discovery and configuration. + Replaced by /dev/fw*, i.e. the <linux/firewire-cdev.h> ABI of + firewire-core. + +Users: + libdc1394 (works with firewire-cdev too, transparent to library ABI + users) diff --git a/Documentation/ABI/testing/sysfs-ata b/Documentation/ABI/testing/sysfs-ata new file mode 100644 index 000000000000..0a932155cbba --- /dev/null +++ b/Documentation/ABI/testing/sysfs-ata @@ -0,0 +1,99 @@ +What: /sys/class/ata_... +Date: August 2008 +Contact: Gwendal Grignou<gwendal@google.com> +Description: + +Provide a place in sysfs for storing the ATA topology of the system. This allows +retrieving various information about ATA objects. + +Files under /sys/class/ata_port +------------------------------- + + For each port, a directory ataX is created where X is the ata_port_id of + the port. The device parent is the ata host device. + +idle_irq (read) + + Number of IRQ received by the port while idle [some ata HBA only]. + +nr_pmp_links (read) + + If a SATA Port Multiplier (PM) is connected, number of link behind it. + +Files under /sys/class/ata_link +------------------------------- + + Behind each port, there is a ata_link. If there is a SATA PM in the + topology, 15 ata_link objects are created. + + If a link is behind a port, the directory name is linkX, where X is + ata_port_id of the port. + If a link is behind a PM, its name is linkX.Y where X is ata_port_id + of the parent port and Y the PM port. + +hw_sata_spd_limit + + Maximum speed supported by the connected SATA device. + +sata_spd_limit + + Maximum speed imposed by libata. + +sata_spd + + Current speed of the link [1.5, 3Gps,...]. + +Files under /sys/class/ata_device +--------------------------------- + + Behind each link, up to two ata device are created. + The name of the directory is devX[.Y].Z where: + - X is ata_port_id of the port where the device is connected, + - Y the port of the PM if any, and + - Z the device id: for PATA, there is usually 2 devices [0,1], + only 1 for SATA. + +class + Device class. Can be "ata" for disk, "atapi" for packet device, + "pmp" for PM, or "none" if no device was found behind the link. + +dma_mode + + Transfer modes supported by the device when in DMA mode. + Mostly used by PATA device. + +pio_mode + + Transfer modes supported by the device when in PIO mode. + Mostly used by PATA device. + +xfer_mode + + Current transfer mode. + +id + + Cached result of IDENTIFY command, as described in ATA8 7.16 and 7.17. + Only valid if the device is not a PM. + +gscr + + Cached result of the dump of PM GSCR register. + Valid registers are: + 0: SATA_PMP_GSCR_PROD_ID, + 1: SATA_PMP_GSCR_REV, + 2: SATA_PMP_GSCR_PORT_INFO, + 32: SATA_PMP_GSCR_ERROR, + 33: SATA_PMP_GSCR_ERROR_EN, + 64: SATA_PMP_GSCR_FEAT, + 96: SATA_PMP_GSCR_FEAT_EN, + 130: SATA_PMP_GSCR_SII_GPIO + Only valid if the device is a PM. + +spdn_cnt + + Number of time libata decided to lower the speed of link due to errors. + +ering + + Formatted output of the error ring of the device. diff --git a/Documentation/ABI/testing/sysfs-block-zram b/Documentation/ABI/testing/sysfs-block-zram new file mode 100644 index 000000000000..c8b3b48ec62c --- /dev/null +++ b/Documentation/ABI/testing/sysfs-block-zram @@ -0,0 +1,99 @@ +What: /sys/block/zram<id>/disksize +Date: August 2010 +Contact: Nitin Gupta <ngupta@vflare.org> +Description: + The disksize file is read-write and specifies the disk size + which represents the limit on the *uncompressed* worth of data + that can be stored in this disk. + +What: /sys/block/zram<id>/initstate +Date: August 2010 +Contact: Nitin Gupta <ngupta@vflare.org> +Description: + The disksize file is read-only and shows the initialization + state of the device. + +What: /sys/block/zram<id>/reset +Date: August 2010 +Contact: Nitin Gupta <ngupta@vflare.org> +Description: + The disksize file is write-only and allows resetting the + device. The reset operation frees all the memory assocaited + with this device. + +What: /sys/block/zram<id>/num_reads +Date: August 2010 +Contact: Nitin Gupta <ngupta@vflare.org> +Description: + The num_reads file is read-only and specifies the number of + reads (failed or successful) done on this device. + +What: /sys/block/zram<id>/num_writes +Date: August 2010 +Contact: Nitin Gupta <ngupta@vflare.org> +Description: + The num_writes file is read-only and specifies the number of + writes (failed or successful) done on this device. + +What: /sys/block/zram<id>/invalid_io +Date: August 2010 +Contact: Nitin Gupta <ngupta@vflare.org> +Description: + The invalid_io file is read-only and specifies the number of + non-page-size-aligned I/O requests issued to this device. + +What: /sys/block/zram<id>/notify_free +Date: August 2010 +Contact: Nitin Gupta <ngupta@vflare.org> +Description: + The notify_free file is read-only and specifies the number of + swap slot free notifications received by this device. These + notifications are send to a swap block device when a swap slot + is freed. This statistic is applicable only when this disk is + being used as a swap disk. + +What: /sys/block/zram<id>/discard +Date: August 2010 +Contact: Nitin Gupta <ngupta@vflare.org> +Description: + The discard file is read-only and specifies the number of + discard requests received by this device. These requests + provide information to block device regarding blocks which are + no longer used by filesystem. + +What: /sys/block/zram<id>/zero_pages +Date: August 2010 +Contact: Nitin Gupta <ngupta@vflare.org> +Description: + The zero_pages file is read-only and specifies number of zero + filled pages written to this disk. No memory is allocated for + such pages. + +What: /sys/block/zram<id>/orig_data_size +Date: August 2010 +Contact: Nitin Gupta <ngupta@vflare.org> +Description: + The orig_data_size file is read-only and specifies uncompressed + size of data stored in this disk. This excludes zero-filled + pages (zero_pages) since no memory is allocated for them. + Unit: bytes + +What: /sys/block/zram<id>/compr_data_size +Date: August 2010 +Contact: Nitin Gupta <ngupta@vflare.org> +Description: + The compr_data_size file is read-only and specifies compressed + size of data stored in this disk. So, compression ratio can be + calculated using orig_data_size and this statistic. + Unit: bytes + +What: /sys/block/zram<id>/mem_used_total +Date: August 2010 +Contact: Nitin Gupta <ngupta@vflare.org> +Description: + The mem_used_total file is read-only and specifies the amount + of memory, including allocator fragmentation and metadata + overhead, allocated for this disk. So, allocator space + efficiency can be calculated using compr_data_size and this + statistic. + Unit: bytes
\ No newline at end of file diff --git a/Documentation/ABI/testing/sysfs-devices-power b/Documentation/ABI/testing/sysfs-devices-power index 6123c523bfd7..7628cd1bc36a 100644 --- a/Documentation/ABI/testing/sysfs-devices-power +++ b/Documentation/ABI/testing/sysfs-devices-power @@ -77,3 +77,91 @@ Description: devices this attribute is set to "enabled" by bus type code or device drivers and in that cases it should be safe to leave the default value. + +What: /sys/devices/.../power/wakeup_count +Date: September 2010 +Contact: Rafael J. Wysocki <rjw@sisk.pl> +Description: + The /sys/devices/.../wakeup_count attribute contains the number + of signaled wakeup events associated with the device. This + attribute is read-only. If the device is not enabled to wake up + the system from sleep states, this attribute is empty. + +What: /sys/devices/.../power/wakeup_active_count +Date: September 2010 +Contact: Rafael J. Wysocki <rjw@sisk.pl> +Description: + The /sys/devices/.../wakeup_active_count attribute contains the + number of times the processing of wakeup events associated with + the device was completed (at the kernel level). This attribute + is read-only. If the device is not enabled to wake up the + system from sleep states, this attribute is empty. + +What: /sys/devices/.../power/wakeup_hit_count +Date: September 2010 +Contact: Rafael J. Wysocki <rjw@sisk.pl> +Description: + The /sys/devices/.../wakeup_hit_count attribute contains the + number of times the processing of a wakeup event associated with + the device might prevent the system from entering a sleep state. + This attribute is read-only. If the device is not enabled to + wake up the system from sleep states, this attribute is empty. + +What: /sys/devices/.../power/wakeup_active +Date: September 2010 +Contact: Rafael J. Wysocki <rjw@sisk.pl> +Description: + The /sys/devices/.../wakeup_active attribute contains either 1, + or 0, depending on whether or not a wakeup event associated with + the device is being processed (1). This attribute is read-only. + If the device is not enabled to wake up the system from sleep + states, this attribute is empty. + +What: /sys/devices/.../power/wakeup_total_time_ms +Date: September 2010 +Contact: Rafael J. Wysocki <rjw@sisk.pl> +Description: + The /sys/devices/.../wakeup_total_time_ms attribute contains + the total time of processing wakeup events associated with the + device, in milliseconds. This attribute is read-only. If the + device is not enabled to wake up the system from sleep states, + this attribute is empty. + +What: /sys/devices/.../power/wakeup_max_time_ms +Date: September 2010 +Contact: Rafael J. Wysocki <rjw@sisk.pl> +Description: + The /sys/devices/.../wakeup_max_time_ms attribute contains + the maximum time of processing a single wakeup event associated + with the device, in milliseconds. This attribute is read-only. + If the device is not enabled to wake up the system from sleep + states, this attribute is empty. + +What: /sys/devices/.../power/wakeup_last_time_ms +Date: September 2010 +Contact: Rafael J. Wysocki <rjw@sisk.pl> +Description: + The /sys/devices/.../wakeup_last_time_ms attribute contains + the value of the monotonic clock corresponding to the time of + signaling the last wakeup event associated with the device, in + milliseconds. This attribute is read-only. If the device is + not enabled to wake up the system from sleep states, this + attribute is empty. + +What: /sys/devices/.../power/autosuspend_delay_ms +Date: September 2010 +Contact: Alan Stern <stern@rowland.harvard.edu> +Description: + The /sys/devices/.../power/autosuspend_delay_ms attribute + contains the autosuspend delay value (in milliseconds). Some + drivers do not want their device to suspend as soon as it + becomes idle at run time; they want the device to remain + inactive for a certain minimum period of time first. That + period is called the autosuspend delay. Negative values will + prevent the device from being suspended at run time (similar + to writing "on" to the power/control attribute). Values >= + 1000 will cause the autosuspend timer expiration to be rounded + up to the nearest second. + + Not all drivers support this attribute. If it isn't supported, + attempts to read or write it will yield I/O errors. diff --git a/Documentation/ABI/testing/sysfs-devices-system-ibm-rtl b/Documentation/ABI/testing/sysfs-devices-system-ibm-rtl new file mode 100644 index 000000000000..b82deeaec314 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-devices-system-ibm-rtl @@ -0,0 +1,22 @@ +What: state +Date: Sep 2010 +KernelVersion: 2.6.37 +Contact: Vernon Mauery <vernux@us.ibm.com> +Description: The state file allows a means by which to change in and + out of Premium Real-Time Mode (PRTM), as well as the + ability to query the current state. + 0 => PRTM off + 1 => PRTM enabled +Users: The ibm-prtm userspace daemon uses this interface. + + +What: version +Date: Sep 2010 +KernelVersion: 2.6.37 +Contact: Vernon Mauery <vernux@us.ibm.com> +Description: The version file provides a means by which to query + the RTL table version that lives in the Extended + BIOS Data Area (EBDA). +Users: The ibm-prtm userspace daemon uses this interface. + + diff --git a/Documentation/ABI/testing/sysfs-driver-hid-roccat-pyra b/Documentation/ABI/testing/sysfs-driver-hid-roccat-pyra new file mode 100644 index 000000000000..ad1125b02ff4 --- /dev/null +++ b/Documentation/ABI/testing/sysfs-driver-hid-roccat-pyra @@ -0,0 +1,98 @@ +What: /sys/bus/usb/devices/<busnum>-<devnum>:<config num>.<interface num>/actual_cpi +Date: August 2010 +Contact: Stefan Achatz <erazor_de@users.sourceforge.net> +Description: It is possible to switch the cpi setting of the mouse with the + press of a button. + When read, this file returns the raw number of the actual cpi + setting reported by the mouse. This number has to be further + processed to receive the real dpi value. + + VALUE DPI + 1 400 + 2 800 + 4 1600 + + This file is readonly. + +What: /sys/bus/usb/devices/<busnum>-<devnum>:<config num>.<interface num>/actual_profile +Date: August 2010 +Contact: Stefan Achatz <erazor_de@users.sourceforge.net> +Description: When read, this file returns the number of the actual profile in + range 0-4. + This file is readonly. + +What: /sys/bus/usb/devices/<busnum>-<devnum>:<config num>.<interface num>/firmware_version +Date: August 2010 +Contact: Stefan Achatz <erazor_de@users.sourceforge.net> +Description: When read, this file returns the raw integer version number of the + firmware reported by the mouse. Using the integer value eases + further usage in other programs. To receive the real version + number the decimal point has to be shifted 2 positions to the + left. E.g. a returned value of 138 means 1.38 + This file is readonly. + +What: /sys/bus/usb/devices/<busnum>-<devnum>:<config num>.<interface num>/profile_settings +Date: August 2010 +Contact: Stefan Achatz <erazor_de@users.sourceforge.net> +Description: The mouse can store 5 profiles which can be switched by the + press of a button. A profile is split in settings and buttons. + profile_settings holds informations like resolution, sensitivity + and light effects. + When written, this file lets one write the respective profile + settings back to the mouse. The data has to be 13 bytes long. + The mouse will reject invalid data. + Which profile to write is determined by the profile number + contained in the data. + This file is writeonly. + +What: /sys/bus/usb/devices/<busnum>-<devnum>:<config num>.<interface num>/profile[1-5]_settings +Date: August 2010 +Contact: Stefan Achatz <erazor_de@users.sourceforge.net> +Description: The mouse can store 5 profiles which can be switched by the + press of a button. A profile is split in settings and buttons. + profile_settings holds informations like resolution, sensitivity + and light effects. + When read, these files return the respective profile settings. + The returned data is 13 bytes in size. + This file is readonly. + +What: /sys/bus/usb/devices/<busnum>-<devnum>:<config num>.<interface num>/profile_buttons +Date: August 2010 +Contact: Stefan Achatz <erazor_de@users.sourceforge.net> +Description: The mouse can store 5 profiles which can be switched by the + press of a button. A profile is split in settings and buttons. + profile_buttons holds informations about button layout. + When written, this file lets one write the respective profile + buttons back to the mouse. The data has to be 19 bytes long. + The mouse will reject invalid data. + Which profile to write is determined by the profile number + contained in the data. + This file is writeonly. + +What: /sys/bus/usb/devices/<busnum>-<devnum>:<config num>.<interface num>/profile[1-5]_buttons +Date: August 2010 +Contact: Stefan Achatz <erazor_de@users.sourceforge.net> +Description: The mouse can store 5 profiles which can be switched by the + press of a button. A profile is split in settings and buttons. + profile_buttons holds informations about button layout. + When read, these files return the respective profile buttons. + The returned data is 19 bytes in size. + This file is readonly. + +What: /sys/bus/usb/devices/<busnum>-<devnum>:<config num>.<interface num>/startup_profile +Date: August 2010 +Contact: Stefan Achatz <erazor_de@users.sourceforge.net> +Description: The integer value of this attribute ranges from 0-4. + When read, this attribute returns the number of the profile + that's active when the mouse is powered on. + This file is readonly. + +What: /sys/bus/usb/devices/<busnum>-<devnum>:<config num>.<interface num>/settings +Date: August 2010 +Contact: Stefan Achatz <erazor_de@users.sourceforge.net> +Description: When read, this file returns the settings stored in the mouse. + The size of the data is 3 bytes and holds information on the + startup_profile. + When written, this file lets write settings back to the mouse. + The data has to be 3 bytes long. The mouse will reject invalid + data. diff --git a/Documentation/ABI/testing/sysfs-module b/Documentation/ABI/testing/sysfs-module new file mode 100644 index 000000000000..cfcec3bffc0a --- /dev/null +++ b/Documentation/ABI/testing/sysfs-module @@ -0,0 +1,12 @@ +What: /sys/module/pch_phub/drivers/.../pch_mac +Date: August 2010 +KernelVersion: 2.6.35 +Contact: masa-korg@dsn.okisemi.com +Description: Write/read GbE MAC address. + +What: /sys/module/pch_phub/drivers/.../pch_firmware +Date: August 2010 +KernelVersion: 2.6.35 +Contact: masa-korg@dsn.okisemi.com +Description: Write/read Option ROM data. + diff --git a/Documentation/ABI/testing/sysfs-power b/Documentation/ABI/testing/sysfs-power index 2875f1f74a07..194ca446ac28 100644 --- a/Documentation/ABI/testing/sysfs-power +++ b/Documentation/ABI/testing/sysfs-power @@ -99,9 +99,38 @@ Description: dmesg -s 1000000 | grep 'hash matches' + If you do not get any matches (or they appear to be false + positives), it is possible that the last PM event point + referred to a device created by a loadable kernel module. In + this case cat /sys/power/pm_trace_dev_match (see below) after + your system is started up and the kernel modules are loaded. + CAUTION: Using it will cause your machine's real-time (CMOS) clock to be set to a random invalid time after a resume. +What; /sys/power/pm_trace_dev_match +Date: October 2010 +Contact: James Hogan <james@albanarts.com> +Description: + The /sys/power/pm_trace_dev_match file contains the name of the + device associated with the last PM event point saved in the RTC + across reboots when pm_trace has been used. More precisely it + contains the list of current devices (including those + registered by loadable kernel modules since boot) which match + the device hash in the RTC at boot, with a newline after each + one. + + The advantage of this file over the hash matches printed to the + kernel log (see /sys/power/pm_trace), is that it includes + devices created after boot by loadable kernel modules. + + Due to the small hash size necessary to fit in the RTC, it is + possible that more than one device matches the hash, in which + case further investigation is required to determine which + device is causing the problem. Note that genuine RTC clock + values (such as when pm_trace has not been used), can still + match a device and output it's name here. + What: /sys/power/pm_async Date: January 2009 Contact: Rafael J. Wysocki <rjw@sisk.pl> |
