[Bug 92308] Lenovo X1 OneLink Pro Dock + Lenovo 4k monitor fail

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92308

--- Comment #2 from Benjamin Herrenschmidt <benh at kernel.crashing.org> ---
I will do another dmesg with drm.debug in a minute. In the meantime, I tried
--rate to use a 30Hz rate, and that did crash it. The symptom is a bit
different that previous kernels though, the internal LCD didn't switch to
displaying garbage, but it did hang. I recovered after a few seconds, but then
all displays blinked (looked like it re-detected the external monitor) and this
time everything hung.

There was nothing in the sysfs "error" file after a reboot.

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