https://bugzilla.kernel.org/show_bug.cgi?id=195231
--- Comment #3 from Rogério Brito (rbrito@ime.usp.br) --- Dear Alex,
(In reply to Alex Deucher from comment #2)
Please attach your xorg log and dmesg output. Does appending radeon.runpm=0 on the kernel command line in grub help?
I'm attaching them.
The dmesg output shows an Ooops when I start X from a command line. I had to arrange things via SSH, since the keyboard stops responding and, sometimes, the kernel reboots the system.
Regarding your question, appending radeon.runpm=0 does help. The Oops is absent, but "UVD not responding messages are still present". At least, the system boots up to the desktop and it works, but I don't quite know how to check which card is working at a given point in time (if the Intel one or the if the radeon card).
Thanks,
Rogério.