https://bugs.freedesktop.org/show_bug.cgi?id=52345
Bug #: 52345 Summary: KMS Power Management have no effect Classification: Unclassified Product: DRI Version: XOrg CVS Platform: Other OS/Version: All Status: NEW Severity: normal Priority: medium Component: DRM/Radeon AssignedTo: dri-devel@lists.freedesktop.org ReportedBy: d2xdt2@gmail.com
Using
OpenGL vendor string: X.Org OpenGL renderer string: Gallium 0.4 on AMD SUMO2 OpenGL version string: 2.1 Mesa 8.0.3 OpenGL shading language version string: 1.20
AMD A4-3400 APU with Radeon(tm) HD Graphics Fedora 17 64bit Linux amd 3.4.5-2.fc17.x86_64 #1 SMP Mon Jul 16 20:52:08 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
According to http://wiki.x.org/wiki/RadeonFeature
should
echo profile > /sys/class/drm/card0/device/power_method echo high > /sys/class/drm/card0/device/power_profile
put the GPU in high performance mode and
echo profile > /sys/class/drm/card0/device/power_method echo low > /sys/class/drm/card0/device/power_profile
in low performance mode.
glxgears gives 60 FPS in both cases, which leads me to beleive that power management does work.