[Bug 91230] New: Mouse cursor drawn at wrong position while running Unity engine games

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91230

            Bug ID: 91230
           Summary: Mouse cursor drawn at wrong position while running
                    Unity engine games
           Product: xorg
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: daniel at constexpr.org
        QA Contact: xorg-team at lists.x.org

Created attachment 116942
  --> https://bugs.freedesktop.org/attachment.cgi?id=116942&action=edit
Xorg.0.log

While running various Unity engine games (tested with  the cursor is drawn
slightly offset to the bottom-right of the real position observed by
applications. It does not matter whether the cursor is over the game's window
or if it has focus or is fullscreen / windowed / iconified.

I have bisected this to the following change in xf86-video-ati:
commit ddaba449e8d6fe9fc0d97085e4045843fd8d7af9
Author: Piotr Redlewski <predlewski at gmail.com>
Date:   Wed Jun 24 18:44:39 2015 +0200

    Disable CRTCs when disabling the outputs

    When turning the outputs off (DPMSModeOff), CRTCs stayed enabled. This led
    to higher gpu temperatures than with fglrx driver.

    v2: when entering DPMS also disable active CRTCs
    v3: use drmmode_set_mode_major() for enabling CRTCs when leaving DPMS

    Signed-off-by: Piotr Redlewski <predlewski at gmail.com>
    Reviewed-by: Michel Dänzer <michel.daenzer at amd.com>

:040000 040000 4cee4e2cdce31663527116812bb616dc0f2d42c6
a4510278e95f9c0006ae2b5d9f2d6caaf589961d M      src


The cursor is drawn at the correct position while not running a Unity engine
game.

GPU: Radeon HD 7950 (TAHITI)
Mesa: git-ff0a41b
LLVM: r241381
glamor: git-347ef4f
libdrm: git-676c806
xorg-server: 1.17.1

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