[Nouveau] Handling GeForce GTX 850M GPU on Arch Linux

[caocoa at mail2tor.com]

OK, I'll do that when I'll have a bit more free time, but likely within
the 10 next days. Shall I fill the report on this site[1] ?

I've read this page[2], I'll try to comply to your needs :)

Caocoa

[1] https://bugs.freedesktop.org
[2] https://wiki.freedesktop.org/nouveau/Bugs/

P.S.: I've previously sent this message only to the last replier instead
of the mailing list, here I fix it.

> On 20 May 2015 at 17:11,  <caocoa at mail2tor.com> wrote:
>> Ok thanks, I'll keep to it for now. Would you like me to (try to) fill a
>> bug report report for that?
>> By the way, if you come to work on that bug, I'll be glad to experiment
>> your solution on my machine :)
> A bug report would be great.
>
> Could you also attach a mmiotrace[1] of the NVIDIA binary driver, and
> another log of nouveau failing with "nouveau.debug=trace
> log_buf_len=1M" in your kernel boot options.
>
> Thanks,
> Ben.
>
> [1] http://nouveau.freedesktop.org/wiki/MmioTrace/
>
>>
>> Caocoa
>>
>>> On 18.05.2015 01:46, Ilia Mirkin wrote:
>>>> Your errors are most likely due to:
>>>>
>>>> [    2.421428] nouveau  [     PFB][0000:01:00.0] RAM size: 1975398418
>>>> MiB
>>>>
>>>> I'm guessing you don't *actually* have 1.9PB of VRAM. At least one
>>>> other person with a GM108 was seeing a similar issue. You're getting a
>>>> bunch of other failed reads, looks like we're somehow not bringing the
>>>> card up properly. The most immediate "fix" is to just disable nouveau
>>>> entirely -- boot with nouveau.modeset=0.
>>>>
>>>> Cheers,
>>>>
>>>>   -ilia
>>>>
>>>
>>>
>>> As the IGPs "tend" to "steal" system memory:
>>>
>>> [   21.733864] nouveau  [     PFB][0000:01:00.0] RAM type: stolen
>>> system
>>> memory
>>> [   21.733883] nouveau  [     PFB][0000:01:00.0] RAM size: 256 MiB
>>> [   21.787222] nouveau  [     DRM] VRAM: 256 MiB
>>>
>>> can we reverse the process in this case, and "steal" a few GB of VRAM
>>> for
>>> a system memory?
>>> I mean there are more than enough.
>>>
>>>
>>>
>>
>>
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>