[Bug 107947] REG_WAIT timeout 10us * 3500 tries - dce_mi_free_dmif line:563 during boot

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=107947

Kent Ross <root.main at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |root.main at gmail.com

--- Comment #3 from Kent Ross <root.main at gmail.com> ---
I have this issue, or one very like it. I have a system with both a Vega64 and
a GTX 980ti. The 980ti is controlled by the vfio-pci driver (preempting
nouveau, nvidiafb, etc. on boot) and is therefore not in use by this host
system.

If a display is plugged into the 980ti at boot time, booting will always fail
with a black screen and more failures from drm. If a display is not plugged in,
booting will almost always work without a problem, with fewer errors from drm.

Even with no display plugged into the 980ti, when the system's displays
(plugged into the vega64) resume when they have been sleeping (such as on the
lock screen) there is a substantial chance all displays will be completely
black and drm failures can be seen in dmesg. If a display is plugged into the
980ti when the main displays wake, the outcome is much less likely to be good.

In the case where the system is returning from sleeping screens it fortunately
does not fully necessitate a complete reboot, as the displays will sleep again
in a few seconds and it can be tried again until success. Nonetheless, as this
system is intended to be used as a VM host with a passed-through monitor, this
bug is a showstopper.

I have full dmesg logs from boot to an unusable black screen, and from boot to
a login screen.

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