Because I am on a macbook the VBIOS might be wonky.
I tried turning off nVidia and using intel. The result was a blank
screen. I know other people had the same bug which was something to do
with reprobing lvds?! I saw patches go by and every time I tried one
the results were the same. fail. I was actually about to post a bug
report to the intel (i915) people about it.
I tried to work out how to get optimus to work. After trying several
different sets of instructions I never found a working configuration
and put it aside. I never used to use opengl but lately my pcb
software has adopted it so my needs changed.
I will get back to you with more results on this matter after I get
the newer kernel up.
On Sat, Feb 14, 2015 at 10:09 PM, Ilia Mirkin <imirkin at alum.mit.edu>
wrote:> 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
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