Nouveau - May 2012 - [Bug 49786] New: In xterm, some rectangles are not redrawn when the window is partly covered

https://bugs.freedesktop.org/show_bug.cgi?id=49786

             Bug #: 49786
           Summary: In xterm, some rectangles are not redrawn when the
                    window is partly covered
    Classification: Unclassified
           Product: xorg
           Version: 7.6 (2010.12)
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
        AssignedTo: nouveau at lists.freedesktop.org
        ReportedBy: vincent-fdt at vinc17.net
         QAContact: xorg-team at lists.x.org


Created attachment 61438
  --> https://bugs.freedesktop.org/attachment.cgi?id=61438
file "text" used in the command to reproduce the bug

When an xterm window is partly covered by another window, not everything is
redrawn. The problem can be reproduced in the following way (this is tested on
a Debian/unstable machine). Run the following command:

$ xterm -geometry 80x60 -e 'sleep 10; cat text; sleep 999'

(with the file "text" that will be attached), then put a smaller
window
covering the middle of the right part, and wait for the text (after "sleep
10"
terminates).

I'll also attach 2 snapshots showing the problem: the first one being what I
obtain after the above steps (corrupt output), the second one being what I
obtain after a full redraw (the correct output), e.g. when switching the
desktop and going back (one can also move a window over the xterm window).

The corresponding Debian bug report:

  http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=640464

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--- Comment #1 from Vincent Lefevre <vincent-fdt at vinc17.net> 2012-05-11
03:27:17 PDT ---
Created attachment 61439
  --> https://bugs.freedesktop.org/attachment.cgi?id=61439
snapshot showing the corrupt display (see the top part of the window)

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https://bugs.freedesktop.org/show_bug.cgi?id=49786

--- Comment #2 from Vincent Lefevre <vincent-fdt at vinc17.net> 2012-05-11
03:28:10 PDT ---
Created attachment 61440
  --> https://bugs.freedesktop.org/attachment.cgi?id=61440
snapshot showing the correct contents after a full redraw

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--- Comment #3 from Vincent Lefevre <vincent-fdt at vinc17.net> 2012-05-11
03:34:16 PDT ---
If I disable acceleration with an xorg.conf file containing

Section "Device"
        Identifier      "Device0"
        Driver          "nouveau"
        Option          "NoAccel" "true"
EndSection

this display problem doesn't occur.

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--- Comment #4 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Can you confirm that this happens with the latest DDX (1.0.9)? If so, we'll
need a bit more information -- please attach both a dmesg + Xorg.0.log for your
system. (Even if there are no errors, they contain information that describes
your system.)

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--- Comment #5 from Vincent Lefevre <vincent-fdt at vinc17.net> ---
Created attachment 84379
  --> https://bugs.freedesktop.org/attachment.cgi?id=84379&action=edit
dmesg output (2013-08-21)

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--- Comment #6 from Vincent Lefevre <vincent-fdt at vinc17.net> ---
Created attachment 84380
  --> https://bugs.freedesktop.org/attachment.cgi?id=84380&action=edit
Xorg.0.log (2013-08-21)

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--- Comment #7 from Vincent Lefevre <vincent-fdt at vinc17.net> ---
Created attachment 84381
  --> https://bugs.freedesktop.org/attachment.cgi?id=84381&action=edit
Shell script to reproduce the bug (needs xterm and base64)

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Vincent Lefevre <vincent-fdt at vinc17.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #84381|0                           |1
        is obsolete|                            |

--- Comment #8 from Vincent Lefevre <vincent-fdt at vinc17.net> ---
Created attachment 84383
  --> https://bugs.freedesktop.org/attachment.cgi?id=84383&action=edit
Shell script to reproduce the bug (needs xterm and base64)

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--- Comment #9 from Vincent Lefevre <vincent-fdt at vinc17.net> ---
(In reply to comment #4)
> Can you confirm that this happens with the latest DDX (1.0.9)? If so,
we'll
> need a bit more information -- please attach both a dmesg + Xorg.0.log for
> your system. (Even if there are no errors, they contain information that
> describes your system.)
The problem still occurs. I don't know what is the DDX, but Xorg.0.log says:

[    47.996] (II) Module nouveau: vendor="X.Org Foundation"
[    47.996]    compiled for 1.12.4, module version = 1.0.9
[    47.996]    Module class: X.Org Video Driver
[    47.996]    ABI class: X.Org Video Driver, version 12.1

I've attached both dmesg output and the Xorg.0.log file after rebooting the
machine and testing.

I've also attached a new shell script to test: it automatically opens the
xterm
windows at the right place (bitmap fonts may need to be enabled, otherwise I
don't know if the bug still occurs). It needs the base64 utility (from the
coreutils) to output the data to the first xterm window. Just wait for a few
seconds for the second xterm then the text to appear.

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Vincent Lefevre <vincent-fdt at vinc17.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #84379|dmesg output (2013-08-21)   |dmesg output - DELL
        description|                            |Latitude E6400 (2013-08-21)

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Vincent Lefevre <vincent-fdt at vinc17.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
  Attachment #84380|Xorg.0.log (2013-08-21)     |Xorg.0.log - DELL Latitude
        description|                            |E6400 (2013-08-21)

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--- Comment #10 from Vincent Lefevre <vincent-fdt at vinc17.net> ---
Some other thing: the dmesg and Xorg.0.log I've attached correspond to the
DELL
Latitude E6400. The bug also occurs on a different machine (not with me here);
I'll try to attach information in the next few days.

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--- Comment #11 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Great repro script! Bug confirmed on my NV96, and disconfirmed on NV18. I see
that your card is a NV98, so this is probably a bug in the nv50 exa logic.

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--- Comment #12 from Vincent Lefevre <vincent-fdt at vinc17.net> ---
FYI, the other machine where the bug occurs also has a NV98 chipset. The exact
card is the following:

  NVIDIA Corporation G98 [Quadro NVS 295] (rev a1)

according to lspci. The one on the DELL Latitude is:

  NVIDIA Corporation G98M [Quadro NVS 160M] (rev a1)

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--- Comment #13 from Ilia Mirkin <imirkin at alum.mit.edu> ---
And as I suspected, if you run a compositor, the issue goes away (e.g. with
xcompmgr).

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--- Comment #14 from Ilia Mirkin <imirkin at alum.mit.edu> ---
Also tested on NV42, doesn't happen there either. Further points to
something
in the nv50 exa rather than something generic...

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Tobias Klausmann <tobias.klausmann at mni.thm.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #15 from Tobias Klausmann <tobias.klausmann at mni.thm.de> ---
still a problem with recent xf86-video-nouveau? Imirkin, maybe you could test
this and just provide a status update

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--- Comment #16 from Ilia Mirkin <imirkin at alum.mit.edu> ---
(In reply to Tobias Klausmann from comment #15)
> still a problem with recent xf86-video-nouveau? Imirkin, maybe you could
> test this and just provide a status update
Nothing has been changed relevant to this, so I don't see why it
wouldn't be.

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--- Comment #17 from Vincent Lefevre <vincent-fdt at vinc17.net> ---
(In reply to Tobias Klausmann from comment #15)
> still a problem with recent xf86-video-nouveau?
This still occurs in Debian/unstable (xserver-xorg-video-nouveau 1:1.0.11-1).

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--- Comment #18 from Vincent Lefevre <vincent-fdt at vinc17.net> ---
(In reply to Vincent Lefevre from comment #17)
> This still occurs in Debian/unstable (xserver-xorg-video-nouveau
1:1.0.11-1).
But in November 2013, I noticed that this bug did not occur every time (after
killing the compositor):

  https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=640464#150

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--- Comment #19 from Vincent Lefevre <vincent-fdt at vinc17.net> ---
The bug still occurs with the xserver-xorg-video-nouveau 1:1.0.12-1 Debian
package and the NVD9 chipset. The video card is:

NVIDIA Corporation GF119 [NVS 315] (rev a1)

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Martin Peres <martin.peres at free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |RESOLVED
         Resolution|---                         |MOVED

--- Comment #20 from Martin Peres <martin.peres at free.fr> ---
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