[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 #14 from Ander Conselvan de Oliveira <conselvan2 at gmail.com> ---
Created attachment 119060
  --> https://bugs.freedesktop.org/attachment.cgi?id=119060&action=edit
Fallback to lower link rate on MST link training

Could you run a kernel with this patch and attach dmesg with debug from boot?

One difference between the link training in SST vs MST mode is that MST uses
the highest rate, while in SST we try the lowest rate that supports the mode.
The DP standard requires the source device to fallback to a lower rate if link
training fails, but our code doesn't do that.

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