[Bug 90963] i915:No display with Display port [drm:intel_dp_start_link_train] *ERROR* too many full retries, give up

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90963

--- Comment #65 from sassmann at redhat.com ---
My setup is the following:
Lenovo w541 docked in ThinkPad Dock with lid close (permanently).
U3415W display connected via DP as the only display.

Following is the current behaviour with latest drp-tip 4.12-rc4.
- Display turns on during BIOS init (grub is fine)
- When booting the kernel a modeswitch happens, this seems to be fine now as
well. Display comes back to display boot messages in a different resolution.
- Another switch happens when gdm is starting. This time the display goes into
standby mode. Then I can switch to VT2 and display comes back to life showing
the login prompt. If I then switch back to VT1 where gdm is running, magically
the gdm login screen shows up and I can login.
- However then locking the screen causes the display to go back into standby
and there's probably a 50% chance of the display never to wake up again. At
this point switching to VT2 also no longer brings the display back.

Attaching another dmesg from exactly that scenario.

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