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

[Ben Skeggs]

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.
>>
>>
>>
>
>
> _______________________________________________
> Nouveau mailing list
> Nouveau at lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/nouveau