https://bugs.freedesktop.org/show_bug.cgi?id=89233
Bug ID: 89233
Summary: Very slow Xorg performace when drawing Qt5's QPainter
Product: xorg
Version: unspecified
Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: Driver/Radeon
Assignee: [email protected]
Reporter: [email protected]
QA Contact: [email protected]
Created attachment 113671
--> https://bugs.freedesktop.org/attachment.cgi?id=113671&action=edit
MWE
My Qt5 based application updates contents of a widget as the mouse moves over
it. Unfortunately the drawing operation causes inexplicably high load and
everything slows down to a crawl. During that time I observe Xorg fully loading
one CPU core, the application itself does not seem to consume much CPU. My
entire desktop is almost unusable until Xorg sorts itself out after a few
seconds.
As of now I found two possible workarounds:
1) Use Qt4 toolkit instead of Qt5
2) Set "Option" "NoAccel" to "true" in Xorg.conf
I believe that this issue has to do with either GLAMOR or xf86-ati drivers
because the application behaves normally on a machine with nVidia card or in
Windows.
I attached a small MWE which demonstrates the problem. Build the MWE with Qt5
toolkit, maximize the window and move mouse over the green area.
Up-to-date Fedora 21
xorg-x11-server 1.16.3
mesa 10.4.3
xorg-x11-drv-ati 7.5.0
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