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

[poma]

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.