[Nouveau] nouveau kms causing hibernation problems

Marcin Kościelnicki koriakin at 0x04.net
Fri Feb 19 04:23:58 PST 2010

> I have an old machine with working hibernation (pm-hibernate). I replaced
> the graphics card with an NV05 one and now it fails to hibernate when using
> modesetting. nouveau.modeset=0 works fine.
> What happens is that very early in the process the display looses signal,
> and the expected disk activity never happens (no led flashing). Then the
> machine just hangs. I suspect that the progress information shown on the
> VGA console in modeset=0 has issues with the framebuffer, and it crashes
> there.
> On the other hand, googling for this gives me nothing, so I guess others
> have this working fine.

There are not that many users of NV04/NV05....

> Any ideas how to debug this?

This may be a result of a known bug in our BIOS script interpreter. Go to your 
kernel tree, drivers/gpu/drm/nouveau/nouveau_bios.c, go to init_compute_mem 
function, and try commenting out the "bios_wr32(bios, NV_PFB_REFCTRL, 

This bug is sure to break suspend on all NV4 and NV5, it probably affects 
hibernate too.

Please report if removing this line changes things for you.

Marcin Kościelnicki

More information about the Nouveau mailing list