[Bug 109059] DisplayPort over USB-C not working after resume

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109059

--- Comment #2 from Martin Jørgensen <mkj at gotu.dk> ---
(In reply to Jani Saarinen from comment #1)
> Hi,
> Please try to reproduce the error using drm-tip
> (https://cgit.freedesktop.org/drm-tip) and kernel parameters drm.debug=0x1e
> log_buf_len=4M, and if the problem persists attach the full dmesg from boot.
> 
> There has been some fixes lately, eg:
> https://bugs.freedesktop.org/show_bug.cgi?id=108616 and some others.
> 
> cc Stan to comment

I have tried latest 4.20-rc6 kernel from drm-tip. After fiddling with the
config to make my laptop boot at least properly, but without many drivers for
my other hardware in the laptop, I seems it's somewhat working well.

When booting with the dock plugged in and monitor on, the monitor shows the
boot console as expected, and get recognized as DP-4 by xrandr.

After suspending, and resuming, the monitor flashes a bit and shows the image
again, but now the monitor is identified as DP-2-2 instead.

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