[Bug 92371] New: external displays unusable on HP Pro x2 612 G1: drm:intel_dp_start_link_train [i915]] *ERROR* too many full retries, give up

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=92371

            Bug ID: 92371
           Summary: external displays unusable on HP Pro x2 612 G1:
                    drm:intel_dp_start_link_train [i915]] *ERROR* too many
                    full retries, give up
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.19.0-0.rc6.git2.1 (also on 3.17.7-300)
          Hardware: x86-64
                OS: Linux
              Tree: Fedora
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - Intel)
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: Rohde.Henning at gmx.net
                CC: intel-gfx-bugs at lists.freedesktop.org
        Regression: No

Created attachment 165311
  --> https://bugzilla.kernel.org/attachment.cgi?id=165311&action=edit
# journalctl -kmb |  grep -i "dmi:\|drm\|graphic\|intel\|i915\|video" | grep
-iv "bluetooth\|[...]

Hello,

after connecting any display, either via DP or VGA, the tablet slows down on
booting while mass-issuing following error:
drm:intel_dp_start_link_train [i915]] *ERROR* too many full retries, give up

dmesg on drm.debug=0xe and i915.mmio_debug=1 is attached.

Same error occurs if display is connected after X11 is up and is activated with
xrandr - the screen on the external display stays off:
$ xrandr --current
Screen 0: minimum 8 x 8, current 1920 x 1200, maximum 32767 x 32767
eDP1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis)
276mm x 156mm
   1920x1080     60.03*+
   1400x1050     59.98  
   1280x1024     60.02  
   1280x960      60.00  
   1024x768      60.00  
   800x600       60.32    56.25  
   640x480       59.94  
DP1 disconnected (normal left inverted right x axis y axis)
DP1-1 connected 1920x1200+0+0 (normal left inverted right x axis y axis) 546mm
x 352mm
   1920x1200     59.95*+
   1024x768      60.00  
   800x600       60.32    56.25  
   848x480       60.00  
   640x480       59.94  
DP1-2 disconnected (normal left inverted right x axis y axis)
DP1-3 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)

$ xrandr --properties
Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 32767 x 32767
eDP1 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis)
276mm x 156mm
    EDID: 
        00ffffffffffff0030e4470400000000
        00170104951c1078024bb59b5b548e25
        1e505400000001010101010101010101
        010101010101143780c270381f403c2e
        3500149c1000001b0000000000000000
        00000000000000000000000000000000
        00000000000000000000000000000002
        000c33ff0f3c961c0f2496000000006d
    BACKLIGHT: 562 
        range: (0, 937)
    Backlight: 562 
        range: (0, 937)
    scaling mode: Full aspect 
        supported: None, Full, Center, Full aspect
    Broadcast RGB: Automatic 
        supported: Automatic, Full, Limited 16:235
    audio: auto 
        supported: force-dvi, off, auto, on
   1920x1080     60.03*+
   1400x1050     59.98  
   1280x1024     60.02  
   1280x960      60.00  
   1024x768      60.00  
   800x600       60.32    56.25  
   640x480       59.94  
DP1 disconnected (normal left inverted right x axis y axis)
    Broadcast RGB: Automatic 
        supported: Automatic, Full, Limited 16:235
    audio: auto 
        supported: force-dvi, off, auto, on
DP1-1 connected (normal left inverted right x axis y axis)
    EDID: 
        00ffffffffffff0022f0692801010101
        05150104a53623782efc81a4554d9d25
        125054210800814081809500a940b300
        d1c001010101283c80a070b023403020
        360022602100001a000000fd003b3d18
        5011000a202020202020000000fc0048
        50205a523234770a20202020000000ff
        00434e54313035313138480a20200041
    Broadcast RGB: Automatic 
        supported: Automatic, Full, Limited 16:235
    audio: auto 
        supported: force-dvi, off, auto, on
   1920x1200     59.95 +
   1920x1080     59.99  
   1600x1200     60.00  
   1680x1050     59.95  
   1280x1024     60.02  
   1440x900      59.89  
   1280x960      60.00  
   1024x768      60.00  
   800x600       60.32  
   640x480       60.00  
DP1-2 disconnected (normal left inverted right x axis y axis)
[...]

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