Comment 100 for bug 1158689

Hi Thomas,

> I have the same NVIDIA GeForce NVS 130M with the disabled functions.
> I checked with nvapeek:
> 0000154c: 0000009c
> 00001540: b1010001

great - finally somebody who confirms this issue.

> uname -a delivers
> Linux mobuntu 3.11.0-15-generic #23-Ubuntu SMP Mon Dec 9 18:17:04 UTC 2013
> x86_64 x86_64 x86_64 GNU/Linux

> I do not have any issues with distorted graphics during normal usage but my
> problem is that resume from suspend mode makes X hang.

> I also have these errors in dmesg
>
> [ 18.985158] nouveau E[ PBUS][0000:01:00.0] MMIO write of 0x00000000
> FAULT at 0x00fd94
> [ 18.986213] nouveau E[ PBUS][0000:01:00.0] MMIO write of 0x00000000
> FAULT at 0x103d94
> [ 19.026027] nouveau E[ PBUS][0000:01:00.0] MMIO write of 0x00000010
> FAULT at 0x10200c

Hmm - your kernel and your nvapeek results clearly suggest you should be affected...

Have you enabled compiz (i.e. OpenGL-based 3D acceleration features)? I assume that so far, you haven't (it does not seem to be active in Ubuntu by default), which most likely is the only reason why you are not seeing the distortion issue (so far).

See e.g.

http://www.howtoforge.com/install-compiz-on-the-unity-desktop-on-ubuntu-12.04-precise-pangolin

(depending on your particular Ubuntu version) on how to enable compiz. I am almost certain that once you have done so, you will also run see the distorted graphics, but you now already know the fix... ;-)

> [ 18.984164] nouveau E[ PTHERM][0000:01:00.0] unhandled intr 0x00000161

This last "PTHERM" error seems to be a different, unrelated issue.

> When I use the kernel option nouveau.config=PCRYPT=0 it doesn't eliminate
> the errors and X still hangs when resuming.

Hmm - interesting, as I clearly don't have any issues with suspend/resume. Which laptop do you have? Did you already update your BIOS to the latest available version?

> I was not sure if I have to set the parameter in quotes.

No, you don't (and AFAIK, you even must not). Ilia has already proposed the correct workaround for the distortion issue (until your distro of choice has integrated the new fix) - add this:

nouveau.config=PCRYPT=0,PVP=0,PBSP=0,PMPEG=0

to your grub kernel parameters. Having done so, all "MMIO write" errors in dmesg must be gone (they are for me!), otherwise something else is still wrong for you in addition.

Hope this helps & best regards,
Andreas

BTW @ Ilia:
Did you already have a chance to contact Ben Skeggs about applying the fix to mainline RHEL 6.5 (and above) kernels?