Okay, one small step further: I checked in the BIOS, and it offers the following three as primary displays: ThinkPad LCD Digital on ThinkPad Display on Dock
Previously I used to see
udippel@Uwe-ThinkPad-Helix-2nd:~$ grep . /sys/class/drm/*/enabled
/sys/class/drm/card0-eDP-1/enabled:enabled
/sys/class/drm/card0-HDMI-A-1/enabled:disabled
/sys/class/drm/card0-HDMI-A-2/enabled:disabled
udippel@Uwe-ThinkPad-Helix-2nd:~$ grep . /sys/class/drm/*/status
/sys/class/drm/card0-eDP-1/status:connected
/sys/class/drm/card0-HDMI-A-1/status:disconnected
/sys/class/drm/card0-HDMI-A-2/status:disconnected
udippel@Uwe-ThinkPad-Helix-2nd:~$ grep . /sys/class/drm/*/dpms
/sys/class/drm/card0-eDP-1/dpms:On
/sys/class/drm/card0-HDMI-A-1/dpms:Off
/sys/class/drm/card0-HDMI-A-2/dpms:Off
Then I attached a cable from the micro-HDMI-port on the side of the ThinkPad to
the monitor. Quite following the obvious logic, what I get is
udippel@Uwe-ThinkPad-Helix-2nd:~$ grep . /sys/class/drm/*/enabled
/sys/class/drm/card0-eDP-1/enabled:enabled
/sys/class/drm/card0-HDMI-A-1/enabled:enabled
/sys/class/drm/card0-HDMI-A-2/enabled:disabled
udippel@Uwe-ThinkPad-Helix-2nd:~$ grep . /sys/class/drm/*/status
/sys/class/drm/card0-eDP-1/status:connected
/sys/class/drm/card0-HDMI-A-1/status:connected
/sys/class/drm/card0-HDMI-A-2/status:disconnected
udippel@Uwe-ThinkPad-Helix-2nd:~$ grep . /sys/class/drm/*/dpms
/sys/class/drm/card0-eDP-1/dpms:On
/sys/class/drm/card0-HDMI-A-1/dpms:On
/sys/class/drm/card0-HDMI-A-2/dpms:Off
So the 'Digital on ThinkPad' seems to be the connector on the side of the
tablet. It checks.
Logically the third entry, HDMI-A-2 will be the Display on Dock. And there it
looks like whatever display, it cannot be detected as 'connected'.
xrandr follows the same logic:
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 8192 x 8192
eDP-1 connected primary 1920x1080+0+0 (normal left inverted right x axis y
axis) 256mm x 144mm
1920x1080 59.99 + 59.97* 59.96 59.93
1680x1050 59.95 59.88
1600x1024 60.17
1400x1050 59.98
1600x900 59.99 59.94 59.95 59.82
1280x1024 60.02
1440x900 59.89
1400x900 59.96 59.88
1280x960 60.00
1440x810 60.00 59.97
1368x768 59.88 59.85
1360x768 59.80 59.96
1280x800 59.99 59.97 59.81 59.91
1152x864 60.00
1280x720 60.00 59.99 59.86 59.74
1024x768 60.04 60.00
960x720 60.00
928x696 60.05
896x672 60.01
1024x576 59.95 59.96 59.90 59.82
960x600 59.93 60.00
960x540 59.96 59.99 59.63 59.82
800x600 60.00 60.32 56.25
840x525 60.01 59.88
864x486 59.92 59.57
800x512 60.17
700x525 59.98
800x450 59.95 59.82
640x512 60.02
720x450 59.89
700x450 59.96 59.88
640x480 60.00 59.94
720x405 59.51 58.99
684x384 59.88 59.85
680x384 59.80 59.96
640x400 59.88 59.98
576x432 60.06
640x360 59.86 59.83 59.84 59.32
512x384 60.00
512x288 60.00 59.92
480x270 59.63 59.82
400x300 60.32 56.34
432x243 59.92 59.57
320x240 60.05
360x202 59.51 59.13
320x180 59.84 59.32
HDMI-1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 708mm
x 398mm
1920x1080 60.00*+ 50.00 59.94 30.00 24.00 29.97 23.98
1920x1080i 60.00 50.00 59.94
1280x1024 60.02
1280x720 60.00 50.00 30.00 59.94 29.97 24.00 23.98
1024x768 60.00
800x600 60.32
720x576 50.00
720x576i 50.00
720x480 60.00 59.94
720x480i 60.00 59.94
640x480 60.00 59.94
HDMI-2 disconnected (normal left inverted right x axis y axis)
A hardware error is not to be expected: The dock is new, and moreover
W10 communicates with it (using the W10-based graphics utility for the
HD5300).
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https://bugs.launchpad.net/bugs/1817367
Title:
Second display does not show up on dock of Lenovo Helix 2
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