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]