Comment # 3 on bug 109548 from Michel Dänzer

Most of the time, if disabling allow_rgb10_configs works around an issue like
this, it's a bug in the application or a higher level library above Mesa.

However, some people are claiming this is a Mesa issue (something about not
(correctly) supporting some VA-API functionality, resulting in the application
using a pixel format that can't work).

It most certainly isn't a kernel driver issue, so reassigning to Mesa for now.

Please attach the output of vainfo when the problem occurs.