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

[bugzilla-daemon@freedesktop.org]

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

--- Comment #42 from Tolga Cakir <cevelnet@gmail.com> ---
I have just reviewed the patch, but I'm unsure, whether I've fully understood
it or not. If I got it right, you're giving an option to manually set
fan-speed. 

However, the driver is still lacking an auto-mode, which needs to work
out-of-the-box. Fan profiles are usually saved in VBIOS (they are also
seperately available in UEFI VBIOS); there is a Windows-only tool called VBE7,
which can extract, modify and save such profiles directly to VBIOS
(http://www.techpowerup.com/forums/threads/vbe7-vbios-editor-for-radeon-hd-7000-series-cards.189089/).

Wouldn't it be possible to implement such behaviour in the drm drivers? I mean
like: reading fan profile (like 40°C -> 20%, 60°C -> 25%, 80°C -> 45% etc. and
assuming linear scaling between those values), reading temperatures and setting
fan-speed accordingly?

I have absolutely no idea, how the Windows driver is handling this, but the
fan-profile saved in VBIOS doesn't seem to have any value for the open source
Radeon drivers, at least for my reference HD7970 card. The card is running in
BIOS-level 40% fan-speed, no matter what. I'd prefer an automatic method over
setting fan-profiles via user-land tools or manually.

Thanks for the great work so far!

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