Bug 108705

Summary: GLX with DRI2 doesn't work properly when xcb is owning the event queue
Product: Mesa Reporter: Yuxuan Shui <yshuiv7>
Component: GLXAssignee: mesa-dev
Status: RESOLVED MOVED QA Contact: mesa-dev
Severity: normal    
Priority: medium    
Version: 18.2   
Hardware: All   
OS: Linux (All)   
Whiteboard:
i915 platform: i915 features:
Bug Depends on:    
Bug Blocks: 105132, 108651    

Description Yuxuan Shui 2018-11-10 18:48:05 UTC 
There was an email thread on this topic before [1]. To summarize, dri2 glx relies on XESetWireToEvent to register DRI2WireToEvent as a callback, so it can get the buffer invalidation events. If xcb is owning the queue, those callbacks won't be called, thus things can't work.

Recently, to avoid a Xlib event handling bug, compton[2] switched to xcb event processing, and that caused some problem with users who don't have DRI3 (for example, nouveau doesn't have DRI3 by default). 

It would be really nice if GLX on DRI2 can work with xcb event processing.

[1]: https://lists.freedesktop.org/archives/xcb/2011-November/007337.html
[2]: https://github.com/yshui/compton
Comment 1 Julien Isorce 2018-11-10 19:02:11 UTC 
Maybe related https://bugs.freedesktop.org/show_bug.cgi?id=105132
Comment 2 GitLab Migration User 2019-09-18 17:46:02 UTC 
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