[Bug 73788] [Radeon HD 7770 GHz Edition] Cape Verde XT: DPM set state failed

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73788

--- Comment #8 from Stepan Bakshaev <step2back+freedesktop at gmail.com> ---
I installed kernel from here
http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.12-trusty/

and try to change power_method by
http://xorg.freedesktop.org/wiki/RadeonFeature/#kmspowermanagementoptions

root at silverstone:/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0# uname -a
Linux silverstone 3.12.0-031200-generic #201311071835 SMP Thu Nov 7 23:36:07
UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

root at silverstone:/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0# cat
/proc/cmdline 
BOOT_IMAGE=/boot/vmlinuz-3.12.0-031200-generic
root=UUID=4d025cce-1bf0-466f-a5c3-501d3f548e70 ro quiet splash vt.handoff=7
radeon.dpm=1

root at silverstone:/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0# echo
"dynpm" > power_method 
bash: echo: write error: Invalid argument
root at silverstone:/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0# echo
"profile" > power_method 
bash: echo: write error: Invalid argument
root at silverstone:/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0# cat
power_method 
dpm

root at silverstone:/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0# echo "high"
> power_profile 
bash: echo: write error: Invalid argument
root at silverstone:/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0# cat
power_profile 
default

root at silverstone:/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0# dmesg |
grep 'drm.*error'

root at silverstone:/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0# cat class 
0x030000
root at silverstone:/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0# cat vendor 
0x1002
root at silverstone:/sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0# cat device 
0x683d

There are no errors and no success in changing power_method. Where did I do
mistake?

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