Bug 63003

Summary: Power management not working on HD7480D
Product: xorg Reporter: Thorsten <thorsten.greeb>
Component: Driver/RadeonAssignee: xf86-video-ati maintainers <xorg-driver-ati>
Status: RESOLVED MOVED QA Contact: Xorg Project Team <xorg-team>
Severity: normal    
Priority: medium    
Version: unspecified   
Hardware: x86-64 (AMD64)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:

Description Thorsten 2013-04-01 18:16:02 UTC
Power management seems not to work at all on HD7480D. I tried to change power profile to "mid" or "low", but nothing happend. I'm using openSUSE 12.3 which has version 7.0.0 of radeon driver. Should power management work with Northern Islands?
Comment 1 Johannes Krampf 2013-04-14 20:19:47 UTC
As of Kernel 3.9-rc6 power management is not yet supported for Trinity. (ARUBA is the code name for the integrated graphics and TN stands for Trinity, the code name of your A4-5300.) 

If you use KMS (Kernel Mode Setting; default since 7.0.0) then power management is done by the kernel. Watch the file linked below for changes in this regard.

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/gpu/drm/radeon/radeon_pm.c?id=refs/tags/v3.9-rc6#n495
Comment 2 Johannes Krampf 2013-06-27 09:31:08 UTC
The recent updates by AMD [1] destined for Linux 3.11 include power management support for Trinity. Once the kernel with these patches is released, add the option radeon.dpm=1 to your kernel command line to active dynamic power management.

[1] http://lists.freedesktop.org/archives/dri-devel/2013-June/040436.html
Comment 3 Martin Peres 2019-11-19 07:40:53 UTC
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