vt(4) vs. sc(4) graphics card temperature/fan control

[Scott Bennett]

Scott Bennett <bennett at sdf.org> wrote:

> Andriy Gapon <avg at FreeBSD.org> wrote:
>
> > On 20/02/2017 11:49, Scott Bennett wrote:
> > >      I haven't seen anything on this list for quite a while about this, but
> > > has there been any progress made on finding out why Xorg's temperature/fan
> > > speed control doesn't work if vt(4) is in use but does still work properly
> > > with sc(4)?  I'm still tied to sc(4) in order to keep the noise down on a
> > > pair of Radeon HD 3270x2 cards, but it is really a drag not being able to
>                        ^
>                        |---- should have been an "8" as in "3870x2"
>
> > > get back to the console if Xorg is exited or crashes.
> >
> > Just curious, what do you use for fan speed control when it works?
> >
>      I don't "use" anything.  Once X starts up, the noise dies down.  When
> a GPU has a bunch of work to do, the fans surge for two or three seconds,
> then slow down again.  That's with sc(4).
>      With vt(4), the fans continue to run full blast from the reboot on.
> Starting X has no effect on the fans.  Load on a GPU has no effect on the
> fans; they continue to run full bore.
>      I don't have any way to see the actual GPU temperatures or the current
> drawn in different situations.  The only inputs I have regarding this are the
> noise levels.  As far as I can tell, only the graphics card fans are affected
> and probably only on the card that is connected to a monitor.  Although the

     I worded that last kind of poorly.  I meant that changes in load probably
only affect the fan speed on the card that has a monitor attached.  All other
behavior is, AFAIK, the same on both cards.

> two cards are connected together by a Crossfire cable, X.org does not support
> coordinated GPU activites, so really only one of the four GPUs ever does
> anything once the r600 driver has been loaded into them.
>
>
>                                   Scott Bennett, Comm. ASMELG, CFIAG
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