[Nouveau] [Bug 68037] New: TRAP_TPDMA - TP0: Unhandled ustatus 0x00000008 ; and other NV50 log spam errors

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=68037

          Priority: medium
            Bug ID: 68037
          Assignee: nouveau at lists.freedesktop.org
           Summary: TRAP_TPDMA - TP0: Unhandled ustatus 0x00000008 ; and
                    other NV50 log spam errors
        QA Contact: xorg-team at lists.x.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: dirkneukirchen at web.de
          Hardware: x86 (IA32)
            Status: NEW
           Version: unspecified
         Component: Driver/nouveau
           Product: xorg

Created attachment 83990
  --> https://bugs.freedesktop.org/attachment.cgi?id=83990&action=edit
dmesg with nouveau.debug=debug

Steps to reproduce:

- log in
- execute glxgears
- message appears

Hardware: 
- Dual Monitor Setup VGA+DVI
- Geforce 8200 (Onboard; Jetway JNC62K)
nouveau  [  DEVICE][0000:02:00.0] Chipset: MCP77/MCP78 (NVAA)
nouveau  [  DEVICE][0000:02:00.0] Family : NV50

example message:
nouveau E[  PGRAPH][0000:02:00.0] TRAP_TPDMA - TP0: Unhandled ustatus
0x00000008
nouveau E[  PGRAPH][0000:02:00.0]  TRAP
nouveau E[  PGRAPH][0000:02:00.0] ch 2 [0x0007b45000 Xorg[4836]] subc 7 class
0x8397 mthd 0x15e0 data 0x00000000
nouveau E[     PFB][0000:02:00.0] trapped write at 0x0020491500 on channel
0x00007b45 [Xorg[4836]] PGRAPH/PROP/RT0 reason: PAGE_NOT_PRESENT
nouveau E[   PFIFO][0000:02:00.0] DMA_PUSHER - ch 2 [Xorg[4836]] get
0x0020025494 put 0x0020025f28 ib_get 0x000000aa ib_put 0x000000c9 state
0x8000e684 (err: INVALID_CMD) push 0x00400040
nouveau E[  PGRAPH][0000:02:00.0] DATA_ERROR BEGIN_END_ACTIVE
nouveau E[  PGRAPH][0000:02:00.0]  DATA_ERROR
nouveau E[  PGRAPH][0000:02:00.0] ch 2 [0x0007b45000 Xorg[4836]] subc 7 class
0x8397 mthd 0x1360 data 0x00000001

Kernel versions affected (at least):
3.11-rc5
3.10.4
3.8.0-27 (Linux Mint 15)
and possible older versions - see
https://bugs.freedesktop.org/show_bug.cgi?id=42479 for a similar message

potential related bugs: 
- https://bugs.freedesktop.org/show_bug.cgi?id=47191

Results of log messages might be somewhat random - maybe because of Video RAM
sharing.

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