linux-kernel - External displays not working [i915|Skylake|4.7.5-1-ARCH|Lenovo X1 Carbon 2016]

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Date:   Wed, 28 Sep 2016 18:44:11 +0200
From:   Nico Schottelius <nico-kernel-20160928@...ottelius.org>
To:     LKML <linux-kernel@...r.kernel.org>
Subject: External displays not working [i915|Skylake|4.7.5-1-ARCH|Lenovo X1 Carbon 2016]


Hello,

trying to get an image on the DP or HDMI output fails on the new Lenovo
X1 Carbon Gen4, because no resolutions are detected and all outputs are
shows as disconnected.

Using xrandr to manually add a mode

      xrandr --newmode "1920x1080_60.00"  109.00  1280 1368 1496 1712  1024 1027 1034 1063 -hsync +vsync
      xrandr --addmode HDMI1 1920x1080_60.00

enables the HDMI output, though still being shown as disconnected. There
are various hints in dmesg [attached], too.

I am using kernel 4.7.5 with xf86-video-intel 1:2.99.917+708+g8f33f80-1.

Has anyone else seen this problem before and has a workaround better
than mine above?

The WM (i3) actually allows me to put a window on the
"disconnected" output, however fullscreen support of evince / pdfpc
completely breaks.

Cheers,

Nico


Download attachment "dmesg" of type "application/octet-stream" (190820 bytes)

View attachment "Xorg.0.log" of type "text/plain" (26436 bytes)




[18:34] feder:~% xrandr
Screen 0: minimum 8 x 8, current 2560 x 1440, maximum 32767 x 32767
eDP1 connected 2560x1440+0+0 (normal left inverted right x axis y axis) 310mm x 170mm
   2560x1440     60.00*+
   1920x1440     60.00
   1856x1392     60.01
   1792x1344     60.01
   2048x1152     60.00
   1920x1080     60.00
   1600x1200     60.00
   1400x1050     59.98
   1600x900      60.00
   1280x1024     60.02
   1280x960      60.00
   1368x768      60.00
   1280x720      60.00
   1024x768      60.00
   1024x576      60.00
   960x540       60.00
   800x600       60.32    56.25
   864x486       60.00
   640x480       59.94
   720x405       60.00
   640x360       60.00
DP1 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)
   1920x1080_60.00  59.89
HDMI2 disconnected (normal left inverted right x axis y axis)
VIRTUAL1 disconnected (normal left inverted right x axis y axis)


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