[Bug 51381] [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than 5secs aborting, when disabled via vgaswitcheroo

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=51381

Peter Uchno <peter.uchno at gmail.com> changed:

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                 CC|                            |peter.uchno at gmail.com

--- Comment #41 from Peter Uchno <peter.uchno at gmail.com> ---
I've started seeing this on a Dell Latitude E6540 with a Radeon 8790M and Intel
hybrid graphics. I'm using vgaswitcheroo to disable the Radeon in Linux. I'm on
Arch Linux, I wasn't seeing the problem in kernel 4.5.0 but I'm seeing it now
in 4.5.1. The kernel spits out errors about the atombios being stuck in a loop
and then fills dmesg with messages about "ring 3 stalled".
After about a full minute of this, X starts on the Intel GPU and the system
seems to run normally. The kernel continues to spit out error messages during
operation. Adding radeon.runpm=0 to the kernel parameters results in  a normal
boot, where the driver starts up normally and X starts up much more quickly. I
do see that a patch related to runtime PM
(e64c952efb8e0c15ae82cec8e455ab4910690ef1) went into the kernel recently.

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