https://bugs.freedesktop.org/show_bug.cgi?id=75917
Priority: medium Bug ID: 75917 Assignee: dri-devel@lists.freedesktop.org Summary: backlight switches of when starting X since kernel-3.13 Severity: normal Classification: Unclassified OS: All Reporter: nl@gnuffy.net Hardware: Other Status: NEW Version: XOrg CVS Component: DRM/Radeon Product: DRI
After updating from linux 3.12.8 to 3.13 my display backlight switches off when starting X. The kernel doesn't crash, it just switched off the backlight.
Hardware name: Acer Aspire 3820T/JM31_CP, BIOS V1.19 10/27/2010
This is a notebook with an intel/radeon hybrid graphics. I use intel for my X. I report this as radeon problem because git bisect (on linux-stable tree) showed the following commit as the cause of my problem:
10ebc0bc09344ab6310309169efc73dfe6c23d72 is the first bad commit commit 10ebc0bc09344ab6310309169efc73dfe6c23d72 Author: Dave Airlie <airlied at redhat.com> Date: Mon Sep 17 14:40:31 2012 +1000
drm/radeon: add runtime PM support (v2)
This hooks radeon up to the runtime PM system to enable dynamic power management for secondary GPUs in switchable and powerxpress laptops.
v2: agd5f: clean up, add module parameter
Signed-off-by: Dave Airlie <airlied at redhat.com> Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
Please let me know if you need addititonal information.