nouveau PGRAPH - ERROR nsource: ILLEGAL_MTHD nstatus: PROTECTION_FAULT

Submitted by Philippe Neyrat

Assigned to Nouveau Project

Link to original bug (#102840)

Description

Hi !

First I don't really know if my problem is posted at the right place, sorry for that, but I don't really understand all the categories...

I got some wrong text rendering in console, and some missing graphical object under X.

I've found some messages in logs such as :
Sep 18 15:39:44 pluton kernel: [ 176.941808] [drm] nouveau 0000:01:00.0: PFIFO_CACHE_ERROR - Ch 3/4 Mthd 0x0000 Data 0x88000004
Sep 18 15:39:44 pluton kernel: [ 176.941840] [drm] nouveau 0000:01:00.0: PGRAPH - ERROR nsource: ILLEGAL_MTHD nstatus: PROTECTION_FAULT
Sep 18 15:39:44 pluton kernel: [ 176.941854] [drm] nouveau 0000:01:00.0: PGRAPH - ch 3 (0x00075000) subc 4 class 0x0000 mthd 0x0180 data 0x00007308

I've found that this bug is old but can't find a solution.

I've tried to install the Nvidia driver, but it freezes at boot, even I made a /etc/X11/xorg.conf file (with nvidia-xconfig).

I'm running Debian Wheezy (up to date):
uname :
Linux pluton 3.2.0-4-rt-686-pae #1 SMP PREEMPT RT Debian 3.2.89-2 i686 GNU/Linux

Can you help me solve this ?
Please note that english is not my native language, so write as simple as you can.

Thanks a lot.

Best regards

Philippe