https://bugzilla.kernel.org/show_bug.cgi?id=81991
Bug ID: 81991
Summary: openSuSE kernel-desktop-3.15.8-2.1.g258e3b0.x86_64
causes horrible backlight flicker - Radeon 1250
Product: ACPI
Version: 2.5
Kernel Version: 3.15.8
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Video
Assignee: [email protected]
Reporter: [email protected]
Regression: No
Yesterday, updating openSuSE 13.1 from
http://download.opensuse.org/repositories/Kernel:/stable/standard/ , I pulled
in the updated kernel:
kernel-desktop-3.15.8-2.1.g258e3b0.x86_64
This was an update from:
kernel-desktop-3.15.6-2.1.gedc5ddf.x86_64
Every 1-2 seconds the backlight flickers horribly. It makes the laptop
unusable. (related to bug report of ACPI backlight keyboard keys not
controlling backlight: https://bugzilla.novell.com/show_bug.cgi?id=887629 ?).
The flicker starts as soon as the kernel is booted, is present during the
splash screen and remain unchanged after the display and window managers load
-- so it is kernel/module related and not desktop related... Booting back into
kernel-desktop-3.15.6-2.1.gedc5ddf.x86_64 and all is fine.
This is on a Toshiba p205d [AMD/ATI] RS690M [Radeon Xpress 1200/1250/1270]. I
have never seen backlight flicker before on this laptop and dropping back to
3.15.6 all is fine.
Discussion with one of the openSuSE kernel maintainers suggested commit
be907c8468c9f47882036109ba550cd2748b86a0 (drm/radeon: set default bl level to
something reasonable) may be part of the problem.
Let me know what all additional information you need and I'll be glad to get
it for you.
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