[Bug 49981] New: On HD6850, Power Profile doesn't change if 2 screen is attached.

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=49981

             Bug #: 49981
           Summary: On HD6850, Power Profile doesn't change if 2 screen is
                    attached.
    Classification: Unclassified
           Product: xorg
           Version: unspecified
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: spamjunkeater at gmail.com
         QAContact: xorg-team at lists.x.org


echo low > /sys/class/drm/card0/device/power_profile

Setting doesn't switch GPU into lower power state with 2 screen attached...


Using OpenSUSE 11.2, mesa, drm and radeon trunk

With one screen attached, everything works.
With 2 screen attached and GPU in default (high) mode :

-------------------------------------------------------
# echo low > /sys/class/drm/card0/device/power_profile
# cat /sys/kernel/debug/dri/0/radeon_pm_info
default engine clock: 775000 kHz
current engine clock: 774980 kHz
default memory clock: 1000000 kHz
current memory clock: 1000000 kHz
voltage: 1150 mV
------------------------------------------------------


In this state, if I disable second screen, than GPU clock lower

-----------------------------------------------------
# cat /sys/kernel/debug/dri/0/radeon_pm_info
default engine clock: 775000 kHz
current engine clock: 99990 kHz
default memory clock: 1000000 kHz
current memory clock: 300000 kHz
voltage: 950 mV
-----------------------------------------------------

In this low power state, if you enable second screen GPU keeps in lower state.
You can increase power profile with
--------------
# echo high > /sys/class/drm/card0/device/power_profile

But trying to reduce power profile again, doesn't work.
Thanks.

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