https://bugs.freedesktop.org/show_bug.cgi?id=45641

--- Comment #10 from Jan Papež (honyczek) honyczek@centrum.cz ---

Does booting with radeon.disp_priority=2 on the kernel command line in grub help?

No.

For systems where this is a regression, can you bisect?

I don't understand. Could you explain this question please (if it was to me)?