[Bug 109750] Second display does not show up on dock of Lenovo Helix 2

Sat Feb 23 16:10:22 UTC 2019

https://bugs.freedesktop.org/show_bug.cgi?id=109750

--- Comment #4 from Uwe Dippel <udippel at gmail.com> ---
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 at 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 at 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 at 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 at 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 at 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 at 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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