[arch-general] Docked Lenovo T540p Not Recognizing Dual Monitors

[Pierre Schmitz]

Am 27.06.2014 17:51, schrieb Jude Lucien:
> I unfortunately have a Lenovo T540p laptop and an UltraDock docking 
> station.
> 
> Plugged into the docking station is a Lenovo monitor via DVI and an 
> Ilyama
> monitor via VGA.
> 
> The monitors are not recognised by xrandr as being separate monitors, 
> and
> the output mirrors each other.
> 
> The output of xrandr -q:
> 
> $ xrandr -q
> Screen 0: minimum 8 x 8, current 4560 x 1620, maximum 32767 x 32767
> eDP1 connected 2880x1620+1680+0 (normal left inverted right x axis y 
> axis)
> 344mm x 193mm
>    2880x1620     59.96*+  50.00
>    2048x1536     60.00
>    1920x1440     60.00
>    1856x1392     60.01
>    1792x1344     60.01
>    1600x1200     60.00
>    1400x1050     59.98
>    1280x1024     60.02
>    1280x960      60.00
>    1024x768      60.00
>    800x600       60.32    56.25
>    640x480       59.94
> VGA1 disconnected (normal left inverted right x axis y axis)
> DP1 disconnected (normal left inverted right x axis y axis)
> HDMI1 disconnected (normal left inverted right x axis y axis)
> DP2 connected 1680x1050+0+0 (normal left inverted right x axis y axis)
> 255mm x 255mm
>    1680x1050     60.00*+
>    1024x768      60.00
>    800x600       60.32    56.25
>    848x480       60.00
>    640x480       59.94
> HDMI2 disconnected (normal left inverted right x axis y axis)
> VIRTUAL1 disconnected (normal left inverted right x axis y axis)
> 
> 
> 
> eDP1 is my laptop monitor and DP2 is the Lenovo monitor.  Notice the
> maximum screen size at the top of the output.  I notice that I have 
> more
> screen than I can use - how to set that to actual size as well?
> 
> But the burning question is how can I get my VGA monitor to be 
> recognised?

There is a good chance the cocking station uses MST to provide all the 
monitor outputs. ATM Linux does not support this; good new is that it's 
being worked on: http://airlied.livejournal.com/79388.html

-- 
Pierre Schmitz, https://pierre-schmitz.com