[Nouveau] Trouble on kernel

[Martin Kaffanke]

Am 2013-10-28 15:42, schrieb Ilia Mirkin:
> On Mon, Oct 28, 2013 at 3:45 AM, Martin Kaffanke <martin.kaffanke at gmx.at> wrote:
>> Hi there,
>>
>> Sometimes my computer crashes since i use now ubuntu 13.10 with
>> unity/compiz.
>
> You're on NV4C. Do you have mesa 9.2.1 or later (or pre-9.2)? If you
> have 9.2.0, there are known issues with shader compilation.

it is 9.2.1 as far as i can see in the package names containing mesa 
(glx and dri)

>> dmesg tells me:
>>
>> [  686.209019] nouveau E[    PBUS][0000:00:0d.0] MMIO write of 0x00000000
>> FAULT at 0x00b020
>
> Odd. That's VPE. You should have one... maybe not. Nothing to worry
> about though. (Especially odd that it's showing up multiple times --
> are you trying to use xvmc?)

At the moment I'm trying nothing, its the default installation, i didn't
change something.

Where do I have to look to find it out?

>> and later:
>>
>> [ 1425.565441] nouveau E[  PGRAPH][0000:00:0d.0]  ERROR nsource: DATA_ERROR
>> nstatus: BAD_ARGUMENT
>> [ 1425.565462] nouveau E[  PGRAPH][0000:00:0d.0] ch 3 [0x00056000
>> compiz[1970]] subc 2 class 0x0039 mthd 0x0314 data 0x031dc000
>
> A bit more concerning:
>
> $ lookup -a 4c -d NV01_SUBCHAN -- -v obj-class NV03_M2MF 0x0314 0x031dc000
> PITCH_IN => 52281344

lookup seems not to work, the package 'lookup' seems to be a different 
tool, right?

> I'm sure that's above some limit. A pitch of 50MB... I wonder how
> that's happening... If you feel like debugging, the place to look is
> nv30_transfer.c (in mesa). Although I would think this would merely
> cause misrendering, not crashes.

I'm not going to do that, because I really not that competent for that, even
if i know about c programming.

I also think that this can cause missrendering, and not crashes, but it 
also seems
that there aren't stored any messages on the crash, maybe it crashes 
before it can
write something to the harddisk?

But thank you for your help.

Martin