https://bugzilla.kernel.org/show_bug.cgi?id=45601
Summary: Asus F80L: backlight brightness as a cooling_device
Product: ACPI
Version: 2.5
Kernel Version: 3.5.0 and earlier
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Video
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: No
Created an attachment (id=76771)
--> (https://bugzilla.kernel.org/attachment.cgi?id=76771)
gzipped acpidump
On my Asus F80L laptop one of the cooling_devices
reports (inverted) backlight brightness level.
cat /sys/class/thermal/cooling_device2/type
LCD
cat /sys/class/thermal/cooling_device2/cur_state
9
# set max brightness by [Fn+F6]
cat /sys/class/thermal/cooling_device2/cur_state
0
# set min brightness by [Fn+F5]
cat /sys/class/thermal/cooling_device2/cur_state
15
ls -l /sys/class/thermal/cooling_device2
lrwxrwxrwx 1 root root 0 Aug 4 23:20 /sys/class/thermal/cooling_device2 ->
../../devices/virtual/thermal/cooling_device2
ls -l /sys/class/thermal/cooling_device2/
total 0
-rw-r--r-- 1 root root 4096 Aug 4 23:22 cur_state
lrwxrwxrwx 1 root root 0 Aug 4 23:22 device ->
../../../LNXSYSTM:00/device:00/PNP0A08:00/LNXVIDEO:01/device:1e
-r--r--r-- 1 root root 4096 Aug 4 23:22 max_state
drwxr-xr-x 2 root root 0 Aug 4 23:22 power
lrwxrwxrwx 1 root root 0 Aug 4 23:11 subsystem -> ../../../../class/thermal
-r--r--r-- 1 root root 4096 Aug 4 23:20 type
-rw-r--r-- 1 root root 4096 Aug 4 23:11 uevent
Brightness level is presented in
/sys/class/backlight/acpi_video0/brightness
There is another file that always gives 0
/sys/class/backlight/intel_backlight/brightness
Other two cooling_devices are useless since
cur_state is always 0 for them
cat /sys/class/thermal/cooling_device[01]/type
Processor
Processor
No fans are detected although the laptop has one.
I do not think that backlight brightness should be
listed in cooling_device directory. I would prefer
to have fan speed instead.
acpidump > asus-f80l-acpidump
Wrong checksum for generic table!
Wrong checksum for generic table!
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