Re: Linux v5.5 serious PCI bug

From: mika.westerberg@xxxxxxxxxxxxxxx
Date: Tue Dec 10 2019 - 07:34:15 EST

On Tue, Dec 10, 2019 at 12:00:23PM +0000, Nicholas Johnson wrote:
> The following is the culprit responsible for the issues:
> commit 586bc4aab878efcf672536f0cdec3d04b6990c94
> Author: Alex Deucher <alexander.deucher@xxxxxxx>
> Date: Fri Nov 22 16:43:50 2019 -0500
> ALSA: hda/hdmi - fix vgaswitcheroo detection for AMD
> It is playing with PCI devices. Clearly they did not consider
> hot-removal. I am guessing it is seeing the audio PCI func of the AMD
> card in that Thunderbolt eGPU enclosure.
> I will collect information, make a bugzilla report and contact the AMD
> team. If anybody wants to be cc'd in then let me know. Sorry for
> bothering you and Bjorn with something which actually has nothing
> directly to do with the PCI subsystem or Thunderbolt.

No problem. Thanks for taking time to bisect the issue.