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

[bugzilla-daemon at freedesktop.org]

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 at lists.freedesktop.org
        ReportedBy: mjulien.m at 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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