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

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

--- Comment #71 from Dhinakaran Pandiyan <dhinakaran.pandiyan at intel.com> ---
(In reply to sassmann from comment #65)
> 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.


Can you please try the patch -"Update connector status and keep aux powered up"
I've attached?

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