Fwd: unable to boot when monitor is attached

[Bagas Sanjaya]

Hi,

I notice a regression report on Bugzilla [1]. Quoting from it:

> 
> In the latest 6.3 and 6.4, it is impossible for me to boot my laptop if my DELL U2720Q monitor is plugged in (USB-C). I have to unplug it, then boot. As soon as the first second of boot went through, I can plug in my monitor and there is no issue afterward. There is no issue waking up after suspend. Only when it boots.
> 
> See the attached pictures of the trace. The trace itself seems random (at least to me :)). I tried several things, like removing any attached USB devices from the monitor built-in USB-hub, but that does not change anything. (there is a keyboard and trackpad attached).

See Bugzilla for the full thread.

Unfortunately, the reporter can only provide photos of kernel trace
(as he doesn't have any other means to extract kernel logs, maybe
connecting over serial helps; see Bugzilla for these attachments).

Anyway, I'm adding it to regzbot so that it doesn't fall through
cracks unnoticed:

#regzbot introduced: v6.1..v6.3 https://bugzilla.kernel.org/show_bug.cgi?id=217637
#regzbot title: unable to boot with Dell U2720Q monitor attached

Thanks.

[1]: https://bugzilla.kernel.org/show_bug.cgi?id=217637

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