[Bug 64131] New: Radeon card stays in highest DPM power state on boot and after resume

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=64131

            Bug ID: 64131
           Summary: Radeon card stays in highest DPM power state on boot
                    and after resume
           Product: Drivers
           Version: 2.5
    Kernel Version: v3.12-rc5-g34ec4de
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: lekensteyn at gmail.com
        Regression: No

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.

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