Nouveau - Oct 2011 - [Bug 42384] New: X fails on NV11 with Error allocating scanout buffer: 0

https://bugs.freedesktop.org/show_bug.cgi?id=42384

             Bug #: 42384
           Summary: X fails on NV11 with Error allocating scanout buffer:
                    0
    Classification: Unclassified
           Product: xorg
           Version: git
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: chris at edesix.com
         QAContact: xorg-team at lists.x.org


Created attachment 52902
  --> https://bugs.freedesktop.org/attachment.cgi?id=52902
xorg log

Hi,

I have an old Geforce2Go card (NV11). The nouveau framebuffer is working fine
(KMS enabled), but X won't start with the nouveau driver (it's okay with
fbdev):

[    54.231] (II) NOUVEAU(0): Opened GPU channel 1
[    54.231] (II) NOUVEAU(0): [DRI2] Setup complete
[    54.231] (II) NOUVEAU(0): [DRI2]   DRI driver: nouveau_vieux
[    54.231] (II) NOUVEAU(0): [DRI2]   VDPAU driver: nouveau_vieux
[    54.233] (EE) NOUVEAU(0): Error allocating scanout buffer: 0
[    54.233] 
Fatal server error:
[    54.233] AddScreen/ScreenInit failed for driver 0

I'm on Fedora 15 and I have tried with the latest packaged driver and with a
build of xf86-video-nouveau from git.

xf86-video-nouveau: git 29 Oct 2011
libdrm-2.4.26-1.fc15.i686
xorg-x11-server-Xorg-1.10.4-1.fc15.i686

I'm not interested in 3D, but I can't work out if there's something
I've failed
to disable. If you need me to enable more debug, please point to some
instructions on how to do this.

dmesg, Xorg logs & cfg attached.

Regards,
Chris.

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--- Comment #2 from Chris Paulson-Ellis <chris at edesix.com> 2011-10-29
12:43:04 UTC ---
Created attachment 52904
  --> https://bugs.freedesktop.org/attachment.cgi?id=52904
xorg config

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--- Comment #3 from Marcin Slusarz <marcin.slusarz at gmail.com>
2011-10-29 13:10:12 UTC ---
Does it work if you lower bpp/resolution for framebuffer and/or xserver?

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Marcin Slusarz <marcin.slusarz at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #52904|application/octet-stream    |text/plain
          mime type|                            |

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--- Comment #1 from Chris Paulson-Ellis <chris at edesix.com> 2011-10-29
12:42:27 PDT ---
Created attachment 52903
  --> https://bugs.freedesktop.org/attachment.cgi?id=52903
kernel log

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Marcin Slusarz <marcin.slusarz at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #52902|text/x-log                  |text/plain
          mime type|                            |

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--- Comment #4 from Marcin Slusarz <marcin.slusarz at gmail.com>
2011-10-30 03:55:48 PDT ---
On Sat, Oct 29, 2011 at 11:26:59PM +0100, Chris Paulson-Ellis
wrote:
> On 29/10/11 22:06, Chris Paulson-Ellis wrote:
> > On 29/10/11 14:10, bugzilla-daemon at freedesktop.org wrote:
> >> https://bugs.freedesktop.org/show_bug.cgi?id=42384
> >>
> >> --- Comment #3 from Marcin Slusarz<marcin.slusarz at
gmail.com>
> >> 2011-10-29 13:10:12 UTC ---
> >> Does it work if you lower bpp/resolution for framebuffer and/or
xserver?
> >>
> >
> > Can't get bugzilla to work for this comment at present,...
Then please CC bugzilla-daemon at freedesktop.org - mails will be automatically
appended to bugreport.
> > Yes. It works if I reduce the framebuffer and the X server to 800x600 
> > 16bpp. Just reducing to 16bpp doesn't work. Just changing the X
server
> > doesn't work, I have to change the framebuffer too.
> >
> > The card has 64MiB.
Nouveau detects only 16 MB of VRAM. Can you verify it by looking at the card?
According to http://www.nvidia.com/page/geforce2go.html there were 16, 32
and 64 MB versions of GeForce2 Go.

Very similar bug was reported few months ago:
http://lists.freedesktop.org/archives/nouveau/2011-July/008631.html

Can you test patch (hack) posted there?
> I can also get it to work using "NoAccel", including at full
1600x1200,
> depth 24, although obviously with fbdev-like performance.
Note: that's almost half of your VRAM.

Marcin

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--- Comment #5 from Chris Paulson-Ellis <chris at edesix.com> 2011-10-30
09:06:24 PDT ---
You're absolutely right. The VRAM is 16Mb. I was misled by the GART aperture
being 64Mb.

No need for the hack. I managed to get it working by setting the framebuffer to
8bpp at the lowest resolution listed in the modelines from the Xorg log
(640x350). I can then get X working at full resolution as long as I use 16bpp.
These together account for <4Mb, so something is being profligate with the
VRAM, but it works, so I'm happy. Thankyou for your help.

For the record, I put the following on the end of the kernel line in grub.conf:
    video=LVDS-1:640x350-8

and my xorg.conf looks like this:

Section "Device"
        Identifier      "n"
        Driver          "nouveau"
EndSection

Section "Screen"
        Identifier      "n"
        Device          "n"
        DefaultDepth    16

        SubSection "Display"
                Depth   16
                Modes   "1600x1200"
        EndSubSection
EndSection

I'll attach new logs.

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Chris Paulson-Ellis <chris at edesix.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #52903|0                           |1
        is obsolete|                            |

--- Comment #6 from Chris Paulson-Ellis <chris at edesix.com> 2011-10-30
09:07:22 PDT ---
Created attachment 52921
  --> https://bugs.freedesktop.org/attachment.cgi?id=52921
dmesg for working config

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Chris Paulson-Ellis <chris at edesix.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #52902|0                           |1
        is obsolete|                            |

--- Comment #7 from Chris Paulson-Ellis <chris at edesix.com> 2011-10-30
09:08:24 PDT ---
Created attachment 52922
  --> https://bugs.freedesktop.org/attachment.cgi?id=52922
xorg log for working config

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Chris Paulson-Ellis <chris at edesix.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #52904|0                           |1
        is obsolete|                            |

--- Comment #8 from Chris Paulson-Ellis <chris at edesix.com> 2011-10-30
09:09:11 PDT ---
Created attachment 52923
  --> https://bugs.freedesktop.org/attachment.cgi?id=52923
working xorg config

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--- Comment #9 from Chris Paulson-Ellis <chris at edesix.com> 2011-10-30
09:12:14 PDT ---
I'm willing to do testing if you want to make changes to make cards such as
mine work out of the box, but I'm guessing you've got bigger fish to fry
than
to worry about such ancient hardware!

Many thanks for your efforts on the driver.

Chris.

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Francisco Jerez <currojerez at riseup.net> changed:

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

--- Comment #10 from Francisco Jerez <currojerez at riseup.net> 2011-11-06
12:57:05 PST ---
(In reply to comment #9)
> I'm willing to do testing if you want to make changes to make cards
such as
> mine work out of the box, but I'm guessing you've got bigger fish
to fry than
> to worry about such ancient hardware!
> 
> Many thanks for your efforts on the driver.
> 
> Chris.
Thanks for reporting, this should be fixed now with the latest nouveau kernel
module (commit
http://cgit.freedesktop.org/nouveau/linux-2.6/commit/?id=787ffe1f651ce3af0d90040ec1c93f0ad177b3de).

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Chris Paulson-Ellis <chris at edesix.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |VERIFIED

--- Comment #11 from Chris Paulson-Ellis <chris at edesix.com> 2011-11-07
20:00:39 PST ---
I can confirm that with this fix (and everything else in the current nouveau
linux git tree), I can now boot without a kernel command line video= parameter
and without an xorg.conf.

Both the framebuffer and the X server use the full 1600x1200 of my laptop panel
and X creates a 24 bit depth display.

Many thanks again,
Chris.

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--- Comment #12 from David Mackenzie <dmackenz1981 at gmail.com>
2011-11-28 12:14:20 PST ---
I have this same problem. How can I install this patch? Do you know when it
will make it into the ubuntu edgers binaries?

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--- Comment #13 from Florian Mickler <florian at mickler.org> 2012-01-12
14:13:16 PST ---
A patch referencing this bug report has been merged in Linux v3.2-rc2:

commit 4beb116a454867cc3a98d02d906e0f0459aefe72
Author: Francisco Jerez <currojerez at riseup.net>
Date:   Sun Nov 6 21:21:28 2011 +0100

    drm/nv10: Change the BO size threshold determining the memory placement
range.

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