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: [email protected]
ReportedBy: [email protected]
QAContact: [email protected]
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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