[Bug 73338] Fan speed in idle at 40% with radeonsi and at 18% with catalyst

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=73338

--- Comment #73 from !evil <a_rappold at gmx.at> ---
(In reply to Chernovsky Oleg from comment #24)
> Created attachment 105853 [details] [review]
> experimental patch for CI (BONAIRE etc.) for enabling fan control
> 
> So I've come up with patch that enables manual fan override for CI family at
> least. I've tested it on my BONAIRE card, Radeon R7 260X.
> 
> INSTALLATION:
> After compile and reboot there will be new debugfs file,
> /sys/class/drm/card0/device/power_fan_control
> 
> READ:
> cat /sys/class/drm/card0/device/power_fan_control
> correct values are 0 to 100
> on first reads it'll probably show some incorrect percentage value due to
> manual control not yet enabled
> 
> WRITE:
> echo 40 > /sys/class/drm/card0/device/power_fan_control
> correct values are 0 to 100

Is there an easy way to get something similar working with the latest kernel
(3.19 rc2)? Obviously there is disabled code (#if 0) but simply enabling it
won't change anything i suppose. Also, I need it for SI (R9 280).

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