[Bug 29433] New: Mouse cursor stutter with kernel 2.6.35

[Bug 29433] New: Mouse cursor stutter with kernel 2.6.35

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=29433

           Summary: Mouse cursor stutter with kernel 2.6.35
           Product: DRI
           Version: unspecified
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Radeon
        AssignedTo: dri-devel@lists.freedesktop.org
        ReportedBy: mjulien.m@gmail.com


Hi,

since I upgraded to kernel 2.6.35, my mouse cursor is not fluid anymore. When I
move it, it stutters sometimes (that is, it makes a small jump on the screen). 

According to latencytop, it seems to come from drm_mod_cursor ioctl which takes
as much as 100ms when the cursor jump. I attach a screenshot of latencytop
window.
This issue seems to appears randomly, maybe more frequent when the cursor
change (arrow to select hand etc.) but I'm not sure.

I don't have this problem with 2.6.34 (nor 2.6.34.1 and 2.6.34.2 ). 
I'm using vanilla kernel (packaged by my distro but without any third party
patch) :
Linux tue-amour 2.6.35-1mdv #1 SMP Mon Aug 2 05:50:00 UTC 2010 x86_64 x86_64
x86_64 GNU/Linux

Xorg 1.7.7
radeon driver 6.13.1 with KMS 
mesa 7.8.1
libdrm 2.4.21

radeon 4870, only one screen attached.
01:00.0 VGA compatible controller: ATI Technologies Inc RV770 [Radeon HD 4870]

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[Bug 29433] Mouse cursor stutter with kernel 2.6.35

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https://bugs.freedesktop.org/show_bug.cgi?id=29433

--- Comment #1 from Alex Deucher <agd5f@yahoo.com> 2010-08-09 08:46:16 PDT ---
Can you bisect to see what commit caused this?  There haven't been any changes
to the cursor code in quite a while.

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[Bug 29433] Mouse cursor stutter with kernel 2.6.35

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https://bugs.freedesktop.org/show_bug.cgi?id=29433

--- Comment #2 from Alex Deucher <agd5f@yahoo.com> 2010-08-09 08:53:42 PDT ---
Is the desktop locked up when this happens (i.e., can you still interact with
apps)?  Please attach your xorg log and dmesg.

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[Bug 29433] Mouse cursor stutter with kernel 2.6.35

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https://bugs.freedesktop.org/show_bug.cgi?id=29433

--- Comment #3 from Mjules <mjulien.m@gmail.com> 2010-08-09 09:22:12 PDT ---
Hi,
thanks for taking care :)

desktop is not frozen nor locked when it happens.
It's just that when I move the cursor, sometimes it « jumps » to about 1cm
forward on the screen (for an analogy it's the same sensation when a video drop
frame).

I'll attach dmesg and Xorg.log but I didn't manage to spot anything in there.

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[Bug 29433] Mouse cursor stutter with kernel 2.6.35

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=29433

--- Comment #4 from Mjules <mjulien.m@gmail.com> 2010-08-09 09:27:05 PDT ---
Created an attachment (id=37730)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=37730)
dmesg

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[Bug 29433] Mouse cursor stutter with kernel 2.6.35

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https://bugs.freedesktop.org/show_bug.cgi?id=29433

--- Comment #5 from Mjules <mjulien.m@gmail.com> 2010-08-09 09:27:36 PDT ---
Created an attachment (id=37731)
 --> (https://bugs.freedesktop.org/attachment.cgi?id=37731)
xorg.log

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[Bug 29433] Mouse cursor stutter with kernel 2.6.35

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https://bugs.freedesktop.org/show_bug.cgi?id=29433

--- Comment #6 from Mjules <mjulien.m@gmail.com> 2010-08-09 12:49:31 PDT ---
My bisection point to commit :
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=eb1f8e4f3be898df808e2dfc131099f5831d491d


eb1f8e4f3be898df808e2dfc131099f5831d491d is the first bad commit
commit eb1f8e4f3be898df808e2dfc131099f5831d491d
Author: Dave Airlie <airlied@redhat.com>
Date:   Fri May 7 06:42:51 2010 +0000

    drm/fbdev: rework output polling to be back in the core. (v4)

    After thinking it over a lot it made more sense for the core to deal with
    the output polling especially so it can notify X.

    v2: drop plans for fake connector - per Michel's comments - fix X patch
sent to xorg-devel, add intel polled/hpd setting, add initial nouveau
polled/hpd settings.

    v3: add config lock take inside polling, add intel/nouveau poll init/fini
calls

    v4: config lock was a bit agressive, only needed around connector list
reading.
    otherwise it could re-enter.

    glisse: discard drm_helper_hpd_irq_event

    v3: Reviewed-by: Michel Dänzer <michel@daenzer.net>
    Signed-off-by: Dave Airlie <airlied@redhat.com>

:040000 040000 01a1bf1ae4e06bfd3ae9ae67b5b5059e964f5ae4
041231a5c060e531ce0d8127c6f7abc79c14ce76 M    drivers
:040000 040000 b67fd6698fa239d26ca9fa2296ea2403e1eaaf1c
cadb905c6d8647313107790ce8b681f4611ee726 M    include

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[Bug 29433] Mouse cursor stutter with kernel 2.6.35

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=29433

--- Comment #7 from Nicolas Kaiser <nikai@nikai.net> 2010-08-09 14:48:42 PDT ---
I could imagine that the latency is caused by the VGA port getting polled.

Can you connect the monitor to VGA instead of DVI? This might work around the
problem.

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[Bug 29433] Mouse cursor stutter with kernel 2.6.35

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=29433

--- Comment #8 from Mjules <mjulien.m@gmail.com> 2010-08-11 09:24:59 PDT ---
(In reply to comment #7)
> I could imagine that the latency is caused by the VGA port getting polled.
> 
> Can you connect the monitor to VGA instead of DVI? This might work around the
> problem.

When the monitor is connected to VGA, symptoms disappear and according to
latencytop, drm_mode_cursor_ioctl only takes a maximum of 5ms.

When both output (VGA + DVI) are connected (clone mode, on the same monitor),
symptoms reappears (latency around 100ms).

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[Bug 29433] Mouse cursor stutter with kernel 2.6.35

[bugzilla-daemon]

https://bugs.freedesktop.org/show_bug.cgi?id=29433

Alex Deucher <agd5f@yahoo.com> changed:

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

--- Comment #9 from Alex Deucher <agd5f@yahoo.com> 2010-08-12 15:08:39 PDT ---


*** This bug has been marked as a duplicate of bug 29536 ***

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