Bug 456420

Summary: No /sys/class/backlight on Lenovo 3000 N200 => can't change screen brightness
Product: [openSUSE] openSUSE 11.1 Reporter: Michael Monreal <michael.monreal>
Component: KernelAssignee: E-mail List <bnc-team-screening>
Status: RESOLVED DUPLICATE QA Contact: E-mail List <qa-bugs>
Severity: Normal    
Priority: P3 - Medium CC: gagarin.gtn, vuntz
Version: RC 1   
Target Milestone: ---   
Hardware: Other   
OS: Other   
Whiteboard:
Found By: --- Services Priority:
Business Priority: Blocker: ---
Marketing QA Status: --- IT Deployment: ---

Description Michael Monreal 2008-12-04 13:43:27 UTC
In 11.1rc1 the PowerManager is unable to change display brightness. Pressing Fn-F10/F11 pops up the brightness control (with no bar shown) but does not actually change anything.

I don't know when this broke but it used to work in 11.0 with the same laptop (Lenovo 3000 N200 with Intel GMA X3100 GM965 graphics).
Comment 1 Rodrigo Moya 2008-12-08 15:19:47 UTC
This works for me, so maybe it's a specific hardware problem?
Comment 2 Michael Monreal 2008-12-08 15:25:42 UTC
It may well be a driver (or at least something below GNOME) issue. Any idea how to debug this any further? Command line tools etc? All I can say that this used to work in 11.0 on the same hardware...
Comment 3 Vincent Untz 2008-12-13 01:58:22 UTC
Michael: can you play in a shell with files in /sys/class/backlight?
Comment 4 Michael Monreal 2008-12-13 13:43:30 UTC
Actually, no, I can't... there's nothing inside /sys/class/backlight :(
Comment 5 Vincent Untz 2008-12-13 18:42:29 UTC
So... that sounds like an issue with whatever is supposed to provide this (a kernel module?). Let's move to the kernel...
Comment 6 Michael Monreal 2008-12-14 11:36:35 UTC
I just booted the Ubuntu 8.10 live cd and it works fine there... I have acpi_video0 and acpi_video1 inside /sys/class/backlight

Ubuntu uses the following kernel/driver versions:

kernel 2.6.27.11
xorg-video-intel 2.4.1

So this is not very different from current openSUSE... maybe a (auto-)config problem in SuSE?
Comment 7 Alexander Orlovskyy 2009-01-09 11:50:24 UTC
openSUSE 11.1 uses following kernel 2.6.27.7-9 

This bug is a duplicate of bug #451024 .



*** This bug has been marked as a duplicate of bug 451024 ***