https://bugzilla.kernel.org/show_bug.cgi?id=66501
Le 04/12/2013 02:16, Aaron Lu a écrit :
On 12/03/2013 06:10 PM, Guillaume Millet wrote:
Le 03/12/2013 05:25, Aaron Lu a écrit :
On 12/03/2013 12:53 AM, Guillaume Millet wrote:
Hello, I report an issue, in attempting to follow the instructions at
https://wiki.ubuntu.com/Bugs/Upstream/kernel#KernelTeam.2BAC8-KernelTeamBugPolicies.Overview_on_Reporting_Bugs_Upstream
[1.] 8086:2a42 [Asus UL80VT] Backlight control does not work with Intel
integrated card, but there are entries in /sys/class/backlight
[2.] The screen brightness control has apparently never worked
off-the-shelf on this laptop, Asus UL80VT-A1, which is an NVIDIA Optimus
laptop (2 graphic cards). The use of the discrete Nvidia card is managed
by Bumblebee (https://wiki.ubuntu.com/Bumblebee). It used to work with
the workaround suggested at
http://wiki.daviddarts.com/Ubuntu_Maverick_on_the_Asus_UL30VT#Screen_Brightness
which modifies asus-brn-down.sh to use the "setpci" method.
Hotkeys are detected, showkey -s returns 0xe0 0x4c 0xe0 0xcc for Fn+F5
and 0xe0 0x54 0xe0 0xd4 for Fn+F6.
When the hotkeys are triggered, there is no brightness change but the
KDE notification pops up with 3 or 4 levels.
[X.] Other notes
$ ls /sys/class/backlight/
acpi_video0 acpi_video1 intel_backlight
$ cat /sys/class/backlight/intel_backlight/max_brightness
2583660
$ cat /sys/class/backlight/intel_backlight/brightness
121584
With v3.12, does the intel_backlight interface work?
You can verify this by echoing some value to the brightness file and see
if it has any effect. The value can be echoed is 0 - max_brightness. Be
careful with very small values, it will black your screen.
If it works, you can specify intel_backlight as the control interface
for X by creating a xorg.conf file like this:
$ cat /etc/Xorg/Xorg.conf
Section "Device"
Option "Backlight" "intel_backlight"
Identifier "Card0"
Driver "intel"
BusID "PCI:0:2:0"
EndSection
The intel_backlight interface does work, by echoing a value between 0
and 2583660.
The control interface for X also works with that addition in
/etc/X11/xorg.conf (Kubuntu).
Wow, the issue was immediately solved by posting here. Thanks Aaron Lu!
After, (out of curiosity) what should be modified so that X
automatically detect the correct control interface, in case of a new
installation for example ?
Please file a bug to https://bugzilla.kernel.org, choose
ACPI-Power/Video category.
Please provide these information when filing the bug:
1 attach dmesg.
2 attach acpidump output.
3 attach dmidecode output.
4 of those backlight control interfaces, which works and which don't.
5 attach /var/log/Xorg.0.log when you do not use the customized xorg.conf,
I want to know which interface is picked up by X driver by default.
Thanks,
Aaron
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