Return to 3.13

root@silverstone:/sys/class/drm/card0/device# uname -a
Linux silverstone 3.13.0-5-generic #20-Ubuntu SMP Mon Jan 20 19:56:38 UTC 2014
x86_64 x86_64 x86_64 GNU/Linux
root@silverstone:/sys/class/drm/card0/device# cat /proc/cmdline 
BOOT_IMAGE=/boot/vmlinuz-3.13.0-5-generic
root=UUID=4d025cce-1bf0-466f-a5c3-501d3f548e70 ro quiet splash vt.handoff=7
radeon.dpm=1

root@silverstone:/sys/class/drm/card0/device# echo "dynpm" > power_method 
bash: echo: write error: Invalid argument
root@silverstone:/sys/class/drm/card0/device# cat power_method 
dpm

root@silverstone:/sys/class/drm/card0/device# echo "high" > power_profile 
bash: echo: write error: Invalid argument

root@silverstone:/sys/class/drm/card0/device# dmesg | grep -i "drm.*error"
[   13.800555] [drm:si_dpm_set_power_state] *ERROR* si_set_sw_state failed

root@silverstone:/sys/class/drm/card0/device# cat vendor 
0x1002
root@silverstone:/sys/class/drm/card0/device# cat device 
0x683d