https://bugzilla.kernel.org/show_bug.cgi?id=39322
Summary: Can't change my laptop's brightness with ATI card and
radeon
Product: ACPI
Version: 2.5
Kernel Version: 2.6.38.2 - 2.6.39.3
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Other
AssignedTo: acpi_power-ot...@kernel-bugs.osdl.org
ReportedBy: bugzi...@ealexp.eu
Regression: No
Since the 2.6.38.2 kernel, I can't change my laptop's brightness. It worked in
2.6.37.6 version. I'm using ArchLinux.
I try to change it by using three ways :
- Fn + brightness up/down keys : nothing happens
- echo <number> > /sys/class/backlight/acpi_video0/brightness : it doesn't
work (but the file exists)
- xbacklight command : it prints "No outputs have backlight property"
I have updated my kernel and I have tried to change the acpi_osi and
acpi_backlight boot options, but it didn't work. I have posted a message on
ArchLinux BBS (https://bbs.archlinux.org/viewtopic.php?pid=960197), but nobody
could help me. I have filled a bug report on archlinux Bugs
(https://bugs.archlinux.org/task/25117), but someone told me to fill a bug
report here.
Additional information :
Kernel version : 2.6.39.3
Laptop : HP Probook 4515s
Graphic card : 01:05.0 VGA compatible controller [0300]: ATI Technologies Inc
RS780M/RS780MN [Radeon HD 3200 Graphics] [1002:9612]
Driver : xf86-video-ati (radeon)
xorg-server version : 1.10.3-1
Desktop environment : KDE
uname -a : Linux localhost 2.6.39-ARCH #1 SMP PREEMPT Sat Jul 9 15:31:04 CEST
2011 i686 AMD Sempron(tm) SI-42 AuthenticAMD GNU/Linux
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