Bug 84253

Summary: XDrawSegments() output truncated if EXAPixmaps = on
Product: xorg Reporter: Martin Schreiber <mse00000>
Component: Server/Acceleration/EXAAssignee: Xorg Project Team <xorg-team>
Status: RESOLVED MOVED QA Contact: Xorg Project Team <xorg-team>
Severity: normal    
Priority: medium CC: mse00000
Version: unspecified   
Hardware: x86 (IA32)   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Attachments:
Description Flags
Test application none

Description Martin Schreiber 2014-09-23 16:39:22 UTC 
Created attachment 106748 [details]
Test application

Since several years MSEgui doesn't work with radeon driver anymore.
http://sourceforge.net/projects/mseide-msegui/

https://bugs.launchpad.net/ubuntu/+bug/373781
https://bugzilla.novell.com/show_bug.cgi?id=690766
https://bugzilla.novell.com/show_bug.cgi?id=852944
https://bugs.freedesktop.org/show_bug.cgi?id=69543

I again unsuccessfully spent several days to try to find a bug in MSEgui, try to find a workaround or to find a small testapplication which shows the problems.
MSEgui paints on a pixmap with the size of the update region which is moved to the window by xcopyarea() after the drawing is complete.
The attached application draws a diagonal line over a grid cell. Every 2 seconds the cell will be invalidated and refreshed. At startup the display is OK, after 2 seconds the diagonal line will be truncated. This has been reproduced on three installations.
If the test-program is started with any command line parameter (ex. "./radeonline abc" the drawing of the blue rectangle is disabled. Two of the three installations always show the diagonal line in this mode with full length, one truncates it after 2 seconds.
With the option "EXAPixmaps" "off" in xorg.conf all is OK.
The simplified testprogram from 
https://bugs.freedesktop.org/show_bug.cgi?id=69543
shows a distorted display also by directly drawing to the window so the double buffering probably is not the culprit.
Comment 1 Michel Dänzer 2014-09-24 02:41:18 UTC 
Probably an EXA issue. Option "EXAPixmaps" "off" mostly avoids the hardware acceleration paths in EXA.
Comment 2 Martin Schreiber 2014-09-24 05:47:09 UTC 
Who is responsible for "Server/Acceleration/EXA"?
Comment 3 Michel Dänzer 2014-09-24 06:14:08 UTC 
Nobody has actively worked on EXA for years.
Comment 4 Martin Schreiber 2014-09-24 06:36:36 UTC 
What to do now? What do you recommend?
Comment 5 GitLab Migration User 2018-12-13 18:23:29 UTC 
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been closed from further activity.

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