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Fix for https://bugzilla.redhat.com/show_bug.cgi?id=1803811 has a regression, reported upstream [0].
The regression breaks hardware acceleration of video encoding/decoding, which could make things like streaming and video watching on high resolutions slow and stutter. Seems to be affecting Firefox and Chromium, so the impact is broad.
Note that hardware accelerated video encoding/decoding for Firefox is quite new, so it wouldn't be a huge change, but still a bad surprise to our customers if they have heard about it.
We should try to fix it in RHEL 7.9 on z-stream, once a fix upstream is available.
[0] https://gitlab.freedesktop.org/mesa/mesa/-/issues/2882
The impact is still not fully known, but at this point we know that certain configurations of Chromium are affected, and Firefox seems to be generally affected.
We believe that the best approach to address this issue is to revert the change included in https://bugzilla.redhat.com/show_bug.cgi?id=1803811, which introduced this regression. This is safe to do, as we are basically coming back to what we had before. Requesting exception.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory (mesa bug fix and enhancement update), and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://access.redhat.com/errata/RHBA-2020:3990