diff options
| author |   Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 12:17:53 -0700 |
|---|---|---|
| committer | Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 15:44:42 -0700 |
| commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
| tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/Documentation/ABI/stable/sysfs-class-backlight | |
| parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) | |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/Documentation/ABI/stable/sysfs-class-backlight')
| -rw-r--r-- | kernel/Documentation/ABI/stable/sysfs-class-backlight | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/kernel/Documentation/ABI/stable/sysfs-class-backlight b/kernel/Documentation/ABI/stable/sysfs-class-backlight new file mode 100644 index 000000000..70302f370 --- /dev/null +++ b/kernel/Documentation/ABI/stable/sysfs-class-backlight @@ -0,0 +1,56 @@ +What: /sys/class/backlight/<backlight>/bl_power +Date: April 2005 +KernelVersion: 2.6.12 +Contact: Richard Purdie <rpurdie@rpsys.net> +Description: + Control BACKLIGHT power, values are FB_BLANK_* from fb.h + - FB_BLANK_UNBLANK (0) : power on. + - FB_BLANK_POWERDOWN (4) : power off +Users: HAL + +What: /sys/class/backlight/<backlight>/brightness +Date: April 2005 +KernelVersion: 2.6.12 +Contact: Richard Purdie <rpurdie@rpsys.net> +Description: + Control the brightness for this <backlight>. Values + are between 0 and max_brightness. This file will also + show the brightness level stored in the driver, which + may not be the actual brightness (see actual_brightness). +Users: HAL + +What: /sys/class/backlight/<backlight>/actual_brightness +Date: March 2006 +KernelVersion: 2.6.17 +Contact: Richard Purdie <rpurdie@rpsys.net> +Description: + Show the actual brightness by querying the hardware. +Users: HAL + +What: /sys/class/backlight/<backlight>/max_brightness +Date: April 2005 +KernelVersion: 2.6.12 +Contact: Richard Purdie <rpurdie@rpsys.net> +Description: + Maximum brightness for <backlight>. +Users: HAL + +What: /sys/class/backlight/<backlight>/type +Date: September 2010 +KernelVersion: 2.6.37 +Contact: Matthew Garrett <mjg@redhat.com> +Description: + The type of interface controlled by <backlight>. + "firmware": The driver uses a standard firmware interface + "platform": The driver uses a platform-specific interface + "raw": The driver controls hardware registers directly + + In the general case, when multiple backlight + interfaces are available for a single device, firmware + control should be preferred to platform control should + be preferred to raw control. Using a firmware + interface reduces the probability of confusion with + the hardware and the OS independently updating the + backlight state. Platform interfaces are mostly a + holdover from pre-standardisation of firmware + interfaces. |