[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 #13 from Eong Chen <eong.chen at gmail.com> ---
(In reply to Ander Conselvan de Oliveira from comment #12)
> (In reply to Eong Chen from comment #11)
> > Created attachment 118986 [details]
> > full dmesg with Ander Conselvan's patch
> > 
> > Tried the patch on 4.2.3.
> 
> Unfortunately that didn't help. It seems we reach the maximum voltage level
> and the monitor still doesn't reach clock recovery. 
> 
> I see in the log that DP MST is being used and according to Viktor this
> started failing with 3.17, which introduce MST support, so this is very
> likely related to that.
> 
> It seems the race between hpd_pulse and modeset that Ville tried to address
> [1] is triggered, except it doesn't look like there is two concurrent calls
> to intel_dp_start_link_train(). 
> 
>     [1] https://patchwork.freedesktop.org/patch/58114/

I tried this patch on 4.2.3, but it leads to crashes with external monitor.

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