456420 – No /sys/class/backlight on Lenovo 3000 N200 => can't change screen brightness

Bug 456420 - No /sys/class/backlight on Lenovo 3000 N200 => can't change screen brightness

Summary: No /sys/class/backlight on Lenovo 3000 N200 => can't change screen brightness

Status:	RESOLVED DUPLICATE of bug 451024

Alias:	None

Product:	openSUSE 11.1
Classification:	openSUSE
Component:	Kernel (show other bugs)
Version:	RC 1
Hardware:	Other Other

Priority:	P3 - Medium Severity: Normal (vote)
Target Milestone:	---
Assignee:	E-mail List
QA Contact:	E-mail List

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Reported:	2008-12-04 13:43 UTC by Michael Monreal
Modified:	2009-01-09 11:50 UTC (History)
CC List:	2 users (show)

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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 ***