[Bug 82763] [drm:intel_dp_start_link_train] error on connecting an external monitor on VGA

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82763

--- Comment #3 from Daniele Pizzolli <daniele.pizzolli at create-net.org> ---
Additional test on 3.17.0-rc3

This is worse than 3.16.  The screen remains black for all modes.

I used the following snippet:

MODES="1920x1200 1920x1080 1600x1200 1680x1050 1280x1024 1440x900 1280x960
1024x768 800x600 640x480"

sudo dmesg -c
for MODE in $MODES;
do
    printf "Trying mode: %s\n" "$MODE"
    xrandr --output DP4 --mode $MODE
    sudo dmesg -c
    sleep 2
done

To get the following output:

Trying mode: 1920x1200
[33982.971039] [drm:ivybridge_set_fifo_underrun_reporting] *ERROR* uncleared
fifo underrun on pipe B
[33982.971043] [drm:ivb_err_int_handler] *ERROR* Pipe B FIFO underrun
Trying mode: 1920x1080
Trying mode: 1600x1200
[33987.636507] [drm:ivybridge_set_fifo_underrun_reporting] *ERROR* uncleared
fifo underrun on pipe B
[33987.636512] [drm:ivb_err_int_handler] *ERROR* Pipe B FIFO underrun
Trying mode: 1680x1050
Trying mode: 1280x1024
[33992.076803] [drm:ivybridge_set_fifo_underrun_reporting] *ERROR* uncleared
fifo underrun on pipe B
[33992.076807] [drm:ivb_err_int_handler] *ERROR* Pipe B FIFO underrun
[33992.235904] [drm:ivybridge_set_fifo_underrun_reporting] *ERROR* uncleared
fifo underrun on pipe B
[33992.235908] [drm:ivb_err_int_handler] *ERROR* Pipe B FIFO underrun
Trying mode: 1440x900
Trying mode: 1280x960
[33996.655649] [drm:ivybridge_set_fifo_underrun_reporting] *ERROR* uncleared
fifo underrun on pipe B
[33996.655656] [drm:ivb_err_int_handler] *ERROR* Pipe B FIFO underrun
[33996.819414] [drm:ivybridge_set_fifo_underrun_reporting] *ERROR* uncleared
fifo underrun on pipe B
[33996.819418] [drm:ivb_err_int_handler] *ERROR* Pipe B FIFO underrun
Trying mode: 1024x768
[33999.101794] [drm:ivybridge_set_fifo_underrun_reporting] *ERROR* uncleared
fifo underrun on pipe B
[33999.101798] [drm:ivb_err_int_handler] *ERROR* Pipe B FIFO underrun
Trying mode: 800x600
[34001.302311] [drm:ivybridge_set_fifo_underrun_reporting] *ERROR* uncleared
fifo underrun on pipe B
[34001.302315] [drm:ivb_err_int_handler] *ERROR* Pipe B FIFO underrun
Trying mode: 640x480
[34003.634664] [drm:ivybridge_set_fifo_underrun_reporting] *ERROR* uncleared
fifo underrun on pipe B
[34003.634668] [drm:ivb_err_int_handler] *ERROR* Pipe B FIFO underrun

Maybe now the problem is a duplicate of 83180

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