Comment # 42
on bug 73338
from Tolga Cakir
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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