[Bug 98812] New: video and switching windows causing flickering

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98812

            Bug ID: 98812
           Summary: video and switching windows causing flickering
           Product: xorg
           Version: 7.6 (2010.12)
          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: spmskr at hotmail.com
        QA Contact: xorg-team at lists.x.org

my xorg flickers a small amount, temporarily, when focus moves from one window
to another.  This happens both when I use alt-tab to cycle through windows or
mouse between windows.

What this flicker looks like:

When switching windows the flickering is very short and then ends after the
switch is done.

When playing full screen video or the video player window enlarged to more than
half the screen size, parts of the picture (an actor's eyes or the timestamp)
very quickly show up in other parts of the screen, and parts of other windows
show up in the video player window.  with a full screen video player only parts
of the playing video show up in other parts of the screen.

with google chrome/chromium pictures of the various windows I have open
flashing on screen in different places for very short times.

The flickering is constant and massive with some applications:

1. chrome with one tab  - a little flickering when switching to chrome
2. chrome with many tabs - lots of flicker with occasional quiet times
3. chrome playing video (youtube) much worse than  2, with occasional quiet
times with little flicker
4. various video programs - flickering only in full screen or when the window
covers most of the screen.  When the window is small (say less than 1/4 of the
total screen size) there's zero to little flicker unless I'm doing one of the
other flicker-inducing acts.
    mpv
    vlc
    mplayer

with these applications below the flickering is only when moving the pointer
onto and off the window. If the pointer is in the window there's no flickering.

    firefox (with or without video, regardless of video size, regardless of
full screen video)


This began after a recent reboot - unfortunately I can't blame the most recent
kernel upgrade because I did not restart my machine for several weeks - I don't
know which kernel (or library or xorg) upgrade this started with

my system information


$uname -a 
   Linux fed2sam 4.8.8-200.fc24.x86_64 #1 SMP Tue Nov 15 19:41:51 UTC 2016
x86_64 x86_64 x86_64 GNU/Linux

$Xorg -version

    X.Org X Server 1.18.4 Release Date: 2016-07-19 X Protocol Version 11,
Revision 0 Build Operating System: 4.7.9-200.fc24.x86_64 Current Operating
System: Linux fed2sam 4.8.8-200.fc24.x86_64 #1 SMP Tue Nov 15 19:41:51 UTC 2016
x86_64 Kernel command line: BOOT_IMAGE=/boot/vmlinuz-4.8.8-200.fc24.x86_64
root=LABEL=fed2_slash ro rhgb quiet LANG=en_CA.utf8 Build Date: 15 November
2016 04:39:46AM Build ID: xorg-x11-server 1.18.4-5.fc24 Current version of
pixman: 0.34.0 Before reporting problems, check http://wiki.x.org to make sure
that you have the latest version.



Other programs that maybe relevant
Sawfish
xfce (using mostly for panels, application dock / start menu / pager / window
list) - the panels are set to always auto-hide - setting them to never
auto-hide made no difference

video card
                product: Curacao XT / Trinidad XT [Radeon R7 370 / R9
270X/370X]

monitor  aoc u2868pqu, displayport

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