From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 65761] HD 7970M Hybrid - hangs and errors and rmmod causes crash
Date: Tue, 21 Jan 2014 21:58:39 +0000
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https://bugzilla.kernel.org/show_bug.cgi?id=65761
--- Comment #18 from Jack ---
>If there is a better way to find out why the fan doesn't shut off
I'm pretty sure the reason the fans don't shut off is because they're reacting
to the dGPU usage. In my incredibly un-scientific observation, I've noticed
that the laptop gets warmer to the touch in Linux than it does in Windows. I'll
be doing some actual testing on this later tonight, but it seems to me that the
actual issue isn't the fans -- it's the fact that the dGPU is revving up and
down on a pretty constant basis, and that's driving the fans to spin up and
down with the dGPU.
One thing I noticed is that if I don't have a compositor running it only goes
up to power level 1, instead of two, when doing things in the OS, ie, browsing
in Chrome, etc. I still don't even think it should be anything but 0 unless
using DRI_PRIME, but might the compositor be interacting with the dGPU through
PRIME, accidentally? I say this without having any real technical knowledge of
how PRIME works.
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