https://bugs.freedesktop.org/show_bug.cgi?id=87682
--- Comment #6 from Felix Schwarz felix.schwarz@oss.schwarz.eu --- (In reply to Thom from comment #5)
I don't know what "git bisect" is but eager to learn.
"bisecting" is a way to find out which commit caused a specific regression. This involves compiling the linux kernel from git and testing the compiled versions. If you can find out which commit is the culprit chances are pretty good that the problem can be fixed quickly.
To learn more about bisecting I suggest seaching for "git bisect".