[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 #54 from Fabio Coatti <fabio.coatti at gmail.com> ---
Hi all, 
I'm getting more or less the same issues.
environment:
linux 4.5.3
xf86-video-intel 2.99.917_p20160423 (and several earlier versions)
Intel(R) Core(TM) i5-3427U CPU @ 1.80GHz
mesa 11.2.1

(gentoo based, vanilla kernel)

External monitor: Dell U2415

short description:
I'm using KDE in multi-monitor setup; if I switch to console with Alt+F2, i
start to see messages like this:

[gio mag  5 15:05:29 2016] [drm:intel_set_cpu_fifo_underrun_reporting] *ERROR*
uncleared fifo underrun on pipe A
[gio mag  5 15:05:29 2016] [drm:ironlake_irq_handler] *ERROR* CPU pipe A FIFO
underrun
[gio mag  5 15:05:29 2016] [drm:intel_set_pch_fifo_underrun_reporting] *ERROR*
uncleared pch fifo underrun on pch transcoder A
[gio mag  5 15:05:29 2016] [drm:cpt_irq_handler] *ERROR* PCH transcoder A FIFO
underrun
[gio mag  5 15:05:29 2016] [drm:intel_check_cpu_fifo_underruns] *ERROR* fifo
underrun on pipe B
[gio mag  5 15:05:29 2016] [drm:intel_check_pch_fifo_underruns] *ERROR* pch
fifo underrun on pch transcoder B
[gio mag  5 15:05:29 2016] [drm:intel_check_cpu_fifo_underruns] *ERROR* fifo
underrun on pipe B



After that, swotching back to graphic mode causes external monitor to enter
power save mode; plugging out the monitor causes this message:
[gio mag  5 15:06:15 2016] [drm:intel_set_pch_fifo_underrun_reporting] *ERROR*
uncleared pch fifo underrun on pch transcoder B

Reconnecting it does not help, while swtiching it off causes both screens to go
blank; switching back it on makes the laptop screen to come back to life, the
external one still in powersave and the dmesg fills up with a lot of the
following messages:

[gio mag  5 15:20:54 2016] [drm:intel_dp_start_link_train] *ERROR* failed to
train DP, aborting
[gio mag  5 15:20:54 2016] [drm:intel_dp_link_training_clock_recovery] *ERROR*
too many full retries, give up
[gio mag  5 15:20:54 2016] [drm:intel_dp_link_training_clock_recovery] *ERROR*
too many full retries, give up
[gio mag  5 15:20:54 2016] [drm:intel_dp_link_training_clock_recovery] *ERROR*
too many full retries, give up
[gio mag  5 15:20:54 2016] [drm:intel_dp_link_training_clock_recovery] *ERROR*
too many full retries, give up
[gio mag  5 15:20:54 2016] [drm:intel_dp_link_training_clock_recovery] *ERROR*
too many full retries, give up
[gio mag  5 15:20:54 2016] [drm:intel_dp_link_training_clock_recovery] *ERROR*
too many full retries, give up
[gio mag  5 15:20:54 2016] [drm:intel_dp_link_training_clock_recovery] *ERROR*
too many full retries, give up
[gio mag  5 15:20:54 2016] [drm:intel_dp_start_link_train] *ERROR* failed to
train DP, aborting


The only way to recover is to turn off the laptop and start it again.

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