[Bug 70651] cannot write to power_dpm_force_performance_level: invalid argument (radeon 7730m)

bugzilla-daemon
2014-02-23T22:36:22Z

--- Comment #5 from Fabio Sangiovanni <sjh+bugzillakernel@sanjioh.org> ---
hi, I'm sorry but the patch doesn't seem to work to me.
I've applied it to 3.13.3:

root@darkstar:/usr/src/linux# patch -p1 < patch.txt
patching file drivers/gpu/drm/radeon/radeon_pm.c
Hunk #7 succeeded at 1580 (offset -20 lines).

This is what I get:

root@darkstar:~# cat /sys/kernel/debug/vgaswitcheroo/switch
0:DIS: :DynOff:0000:01:00.0
1:IGD:+:Pwr:0000:00:02.0

root@darkstar:~# cat /sys/class/drm/card0/device/power_dpm_state
balanced

root@darkstar:~# cat
/sys/class/drm/card0/device/power_dpm_force_performance_level
auto

root@darkstar:~# echo 'high' >
/sys/class/drm/card0/device/power_dpm_force_performance_level
-bash: echo: write error: Invalid argument
root@darkstar:~# echo 'low' >
/sys/class/drm/card0/device/power_dpm_force_performance_level
-bash: echo: write error: Invalid argument
root@darkstar:~# echo 'auto' >
/sys/class/drm/card0/device/power_dpm_force_performance_level
-bash: echo: write error: Invalid argument

root@darkstar:~# cat /sys/kernel/debug/dri/0/radeon_pm_info
default engine clock: 575000 kHz
current engine clock: 210280 kHz
default memory clock: 900000 kHz
current memory clock: 00 kHz
voltage: 825 mV
PCIE lanes: 16

Plus, I've noticed this (unsure if it's missing some sort of parsing):
root@darkstar:~# echo 'batteryxxxx' >
/sys/class/drm/card0/device/power_dpm_state
root@darkstar:~# cat /sys/class/drm/card0/device/power_dpm_state
battery

(Same result with 'performancexxxx' and 'balancedxxxx')

It's ok with random letters as prefix:
root@darkstar:~# echo 'xxxxbattery' >
/sys/class/drm/card0/device/power_dpm_state
-bash: echo: write error: Invalid argument

Please let me know if I can help somehow.

Thanks!