Commen=
t # 42
on bug 73338<=
/a>
from Tolga Cakir
I have just reviewed the patch, but I'm unsure, whether I've f=
ully understood
it or not. If I got it right, you're giving an option to manually set
fan-speed.=20
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 VB=
E7,
which can extract, modify and save such profiles directly to VBIOS
(http://www.techpowerup.com/forums/thr=
eads/vbe7-vbios-editor-for-radeon-hd-7000-series-cards.189089/).
Wouldn't it be possible to implement such behaviour in the drm drivers? I m=
ean
like: reading fan profile (like 40=C2=B0C -> 20%, 60=C2=B0C -> 25%, 8=
0=C2=B0C -> 45% etc. and
assuming linear scaling between those values), reading temperatures and set=
ting
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 sour=
ce
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 ov=
er
setting fan-profiles via user-land tools or manually.
Thanks for the great work so far!