Nouveau - May 2012 - [Bug 50375] New: NV11: KMS/fbcon accel failing after scrolling/tty switch

https://bugs.freedesktop.org/show_bug.cgi?id=50375

             Bug #: 50375
           Summary: NV11: KMS/fbcon accel failing after scrolling/tty
                    switch
    Classification: Unclassified
           Product: xorg
           Version: unspecified
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: bonbons67 at internet.lu
         QAContact: xorg-team at lists.x.org


Created attachment 62127
  --> https://bugs.freedesktop.org/attachment.cgi?id=62127
kernel log

Shortly after loading nouveau kernel module it floods kernel log with messages
and switches to software fbcon. Somewhere in the flood it reports lockup and
the switch.
The easies trigger is switching vts a few times or scrolling text, e.g. with
less.

System is NV11 (nforce IGP) running 3.4.0 kernel.

Extra system information is available at attachment #33464.

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https://bugs.freedesktop.org/show_bug.cgi?id=50375

Ilia Mirkin <imirkin at alum.mit.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|NV11: KMS/fbcon accel       |[NV11] KMS/fbcon accel
                   |failing after scrolling/tty |failing after scrolling/tty
                   |switch                      |switch

--- Comment #1 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Do I assume correctly that this still happens with the latest kernel? If so,
please try the following things (individually) and let me know if there's
any
improvement:

nouveau.vram_pushbuf=1
nouveau.agpmode=0

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Ilia Mirkin <imirkin at alum.mit.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[NV11] KMS/fbcon accel      |[NV1A] KMS/fbcon accel
                   |failing after scrolling/tty |failing after scrolling/tty
                   |switch                      |switch

--- Comment #2 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Oh, also looking at your log, it looks like you actually have the NV1A, not
NV11.

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--- Comment #3 from Bruno <bonbons67 at internet.lu> ---
(In reply to comment #1)
> Do I assume correctly that this still happens with the latest kernel?
Impossible to tell with current kernels (3.8.2, 3.10.7, 3.11-rc6) as VGA output
is not being lit up properly by nouveau (monitor says "no signal").

See also bug #26534, comments 18 and 20.

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--- Comment #4 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Created attachment 84758
  --> https://bugs.freedesktop.org/attachment.cgi?id=84758&action=edit
patch to treat nv1a as pre-nv17

Generationally, NV1A is pre-NV17. However in a bunch of places in the nouveau
code, this wasn't recognized. I believe this patch should help, at least
with
something. Mind trying it out? Should apply on top of a git-ish kernel (but
probably doesn't really matter).

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--- Comment #5 from Bruno <bonbons67 at internet.lu> ---
(In reply to comment #4)
> Created attachment 84758 [details] [review]
> patch to treat nv1a as pre-nv17
> 
> Generationally, NV1A is pre-NV17. However in a bunch of places in the
> nouveau code, this wasn't recognized. I believe this patch should help,
at
> least with something. Mind trying it out? Should apply on top of a git-ish
> kernel (but probably doesn't really matter).
This patch gets the signal to the monitor.

Tested-by: Bruno Pr?mont <bonbons at linux-vserver.org>

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--- Comment #6 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Could you also retest your various bugs with that patch applied to see if
they've resolved themselves? (Including this one.)

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--- Comment #7 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Created attachment 85214
  --> https://bugs.freedesktop.org/attachment.cgi?id=85214&action=edit
add nv11 card type

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Ilia Mirkin <imirkin at alum.mit.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #84758|0                           |1
        is obsolete|                            |

--- Comment #8 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Created attachment 85215
  --> https://bugs.freedesktop.org/attachment.cgi?id=85215&action=edit
fix nv1a chipset checks

can you test with the two patches i just uploaded instead?

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--- Comment #9 from Bruno <bonbons67 at internet.lu> ---
(In reply to comment #8)
> Created attachment 85215 [details] [review]
> fix nv1a chipset checks
> 
> can you test with the two patches i just uploaded instead?
These two patches get the output reaching monitor as well as the previous
patch.


Note: with nouveau loaded (3.11-rc7, previous patch applied) I had memory
(SLAB) corruption as if someone did reuse stale pointers or write beyond
allocated memory. I have no idea on the responsible party though they don't
seem to happen with VGA console (nouveau not loaded).

The scrolling bug seems fixed though.

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Ilia Mirkin <imirkin at alum.mit.edu> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #10 from Ilia Mirkin <imirkin at alum.mit.edu> ---
These patches (well, fixed up versions that actually work for nv11+ correctly)
are now in nouveau/master. As for the memory corruption issue, try using SLUB
with slub_debug=FZPU, that might help figure out what's going wrong. If you
find anything concrete, file a new issue.

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