Bug 64131 - Radeon card stays in highest DPM power state on boot and after resume
Summary: Radeon card stays in highest DPM power state on boot and after resume
Status: NEW
Alias: None
Product: Drivers
Classification: Unclassified
Component: Video(DRI - non Intel) (show other bugs)
Hardware: All Linux
: P1 normal
Assignee: drivers_video-dri
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2013-10-31 17:13 UTC by Peter Wu
Modified: 2016-03-23 18:30 UTC (History)
3 users (show)

See Also:
Kernel Version: v3.12-rc5-g34ec4de
Subsystem:
Regression: No
Bisected commit-id:

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Description Peter Wu 2013-10-31 17:13:50 UTC 
On startup (and after resume), I see the following:
switching from power state:
       ui class: none
       internal class: boot 
       caps: 
       uvd    vclk: 0 dclk: 0
               power level 0    sclk: 10000 mclk: 15000 vddc: 950 vddci: 950
               power level 1    sclk: 10000 mclk: 15000 vddc: 950 vddci: 950
               power level 2    sclk: 10000 mclk: 15000 vddc: 950 vddci: 950
       status: c b 
switching to power state:
       ui class: performance
       internal class: none
       caps: 
       uvd    vclk: 0 dclk: 0
               power level 0    sclk: 10000 mclk: 15000 vddc: 950 vddci: 950
               power level 1    sclk: 77500 mclk: 105000 vddc: 1150 vddci: 1150
               power level 2    sclk: 84000 mclk: 105000 vddc: 1190 vddci: 1150
       status: r 

/sys/kernel/debug/dri/65/radeon_pm_info says:
uvd    vclk: 0 dclk: 0
power level 2    sclk: 84000 mclk: 105000 vddc: 1190 vddci: 1150

The primary boot graphics device is an integrated Intel GPU, to which a monitor is connected. The second HD6790 (BARTS) GPU is headless, but it still stays in the highest power level (2). Only after X has started or an OpenCL program has finished, power level 0 is entered.

Note: just attaching the a monitor does not change the power level, but the switching to performance state kernel messages are printed. X *really* has to be started with the AMD card being used for output, only then it will switch to power level 0.
Comment 1 Dieter Nützel 2014-07-02 01:11:53 UTC 
Try this patch on top of 3.15.x:

https://bugzilla.kernel.org/show_bug.cgi?id=79071#c4
Comment 2 Alex Deucher 2014-07-02 15:16:00 UTC 
barts is a BTC part so the patch in comment 3 is applicable rather than comment 4.
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