[Bug 92632] New: Huge performance drop and inaccurate cursor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92632

            Bug ID: 92632
           Summary: Huge performance drop and inaccurate cursor
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: jan.burgmeier at unicon-software.com
        QA Contact: xorg-team at lists.x.org

Created attachment 119134
  --> https://bugs.freedesktop.org/attachment.cgi?id=119134&action=edit
dmesg output

Hi all,

I'm facing a huge performance drop with latest git version of xf86-video-ati.
Creating and moving windows is very slow. There is also another problem where
the mouse cursor is inaccurate positioned by some pixels when it is changed
(input cursor, windows resize cursor, ...)
This does not happen with the last released version 7.5.0.

I bisected the driver and found the bad commit before that commit or when it is
reverted both problems do not appear:

673e1c7637687c74fc9bdeeeffb7ace0d04b734f is the first bad commit
commit 673e1c7637687c74fc9bdeeeffb7ace0d04b734f
Author: Michel Dänzer <michel.daenzer at amd.com>
Date:   Thu Apr 2 17:54:33 2015 +0900

    Defer initial modeset until the first BlockHandler invocation

    This ensures that the screen pixmap contents have been initialized when
    the initial modes are set.

    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=27757

    Reviewed-by: Alex Deucher <alexander.deucher at amd.com>

Kind regards
Jan Burgmeier

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