[Bug 109522] drm:intel_dp_start_link_train [i915] *ERROR* failed to enable link training

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=109522

--- Comment #34 from howaboutsynergy <howaboutsynergy at pm.me> ---
Created attachment 144741
  --> https://bugs.freedesktop.org/attachment.cgi?id=144741&action=edit
dmesg with patch from comment 33 and drm.debug=0xe

tl;dr: the issue persists even with that patch.

I tried these steps inside `startx`, twice:
turn off monitor, 
then ran `monoff` to put card(?) to sleep, 
then typed something to wake up card(while monitor is still off),
then turned on the monitor.
(there's some intentional delay(few seconds) between each step)

The second time I tried it, I failed to properly execute `logger` to add my own
message(s) to `dmesg`, as follows:

```
user at i87k 2019/07/09 14:42:04 -bash5.0.7 t:4 j:0 d:3 pp:1149 p:1269 ut217
!36219 7 0  5.2.0-g0ecfebd2b524 #19 SMP Tue Jul 9 14:35:54 CEST 2019
/home/user 
$ logger "ok, monior is off, about to execute monoff"
-----------
user at i87k 2019/07/09 14:42:19 -bash5.0.7 t:4 j:0 d:3 pp:1149 p:1269 ut232
!36220 8 0  5.2.0-g0ecfebd2b524 #19 SMP Tue Jul 9 14:35:54 CEST 2019
/home/user 
$ monoff
setterm: terminal xterm-256color does not support --blank
-----------
user at i87k 2019/07/09 14:42:27 -bash5.0.7 t:4 j:0 d:3 pp:1149 p:1269 ut240
!36221 9 0  5.2.0-g0ecfebd2b524 #19 SMP Tue Jul 9 14:35:54 CEST 2019
/home/user 
$ ld someething to wake up the card"
> logger "monitor is still off, btw"
> logger "about to tun on the monitor"
> ^C
-----------
user at i87k 2019/07/09 14:43:31 -bash5.0.7 t:4 j:0 d:3 pp:1149 p:1269 ut303
!36222 9 0  5.2.0-g0ecfebd2b524 #19 SMP Tue Jul 9 14:35:54 CEST 2019
/home/user 
$
```

in the above, the command:
`$ ld someething to wake up the card"`
is supposed to be:
`$ logger "typed someething to wake up the card"`
but somehow those keys(`ogger "type`) got eaten up, probably due to drm doing
its thing after my typing woke up the card

The 'utNUM' at the end of my prompt is uptime(seconds), it might help correlate
the events with the ones in dmesg.

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