[Nouveau] Bug or not?

[Ilia Mirkin]

On Sat, Feb 14, 2015 at 9:56 PM, Evan Foss <evanfoss at gmail.com> wrote:
> I have a side question which may be the subject of a future second bug
> report. I have been lurking on the nouveau mailing list for some time.
> I understand from various posts that the nvidia gpu clock speed right
> now is set to the lowest possible setting. Why does my machine run so

Often but not always the case -- the clock speed is whatever the VBIOS
leaves it in. For kepler, that is usually the lowest setting.

> much hotter in linux than macos? I turned off the intel graphics and
> the cpu clock is set to the lowest available speed.

You should instead turn off the nvidia graphics and run off intel --
intel is much less power-hungry than nvidia, even at the lowest
clocks. If it's an optimus setup, the nvidia gpu should automatically
power off until needed (either because some display is connected to
it, or for offloading).

>
> How do I get a display of the GPU clocking speeds?

You should see it in dmesg... look for CLK lines. The ones with -- (or
AC/DC) will show the current setting. Or boot with nouveau.pstate=1
and you should have a /sys/class/drm/card*/device/pstate file.

  -ilia