[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 #13 from howaboutsynergy at pm.me ---
ok I got it:
1. first turn off monitor
2. while monitor is off, run that `monoff` script from the prev. comment, yes
this:
```
sleep 1; xset dpms force suspend; sleep 1; xset dpms force off; sleep 1; xset
dpms force standby
setterm --blank force
```
3. wait a few seconds to be sure
4. press Ctrl key to wake up desktop
5. turn on monitor

got:
```
[  694.869217] [drm:intel_dp_set_link_train [i915]] *ERROR* ret=-110 len=5
[  694.869243] [drm:intel_dp_start_link_train [i915]] *ERROR* failed to enable
link training
[  695.138593] [drm:intel_dp_set_link_train [i915]] *ERROR* ret=-110 len=1
[  696.768921] [drm:intel_dp_set_link_train [i915]] *ERROR* ret=5 len=5
[  696.770645] [drm:intel_dp_set_link_train [i915]] *ERROR* ret=5 len=5
[  696.773386] [drm:intel_dp_set_link_train [i915]] *ERROR* ret=1 len=1
```

Ok I tried it again, but left 10 seconds before actually doing step 5:

```
[  887.319215] [drm:intel_dp_set_link_train [i915]] *ERROR* ret=-110 len=5
[  887.319254] [drm:intel_dp_start_link_train [i915]] *ERROR* failed to enable
link training
[  887.588579] [drm:intel_dp_set_link_train [i915]] *ERROR* ret=-110 len=1
[  898.050275] [drm:intel_dp_set_link_train [i915]] *ERROR* ret=5 len=5
[  898.052012] [drm:intel_dp_set_link_train [i915]] *ERROR* ret=5 len=5
[  898.054707] [drm:intel_dp_set_link_train [i915]] *ERROR* ret=1 len=1
```

So looks like link is Good afterwards(after step 5 that is), but something
keeps track of link as being still Bad (via xrandr) if it once was Bad (10
seconds ago).

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