P50 docking station

Hi!
I have a Latitude E7740 that runs Ubuntu Xenial (16.04). I dock it to a "Dell EURO2 Advanced E-port II" docking station. 
If I boot it in the docking station, everything works fine, and I find all my two DVI-connected monitors. 
However, if I undock, then put it into the dock again while running, it fails to enable the screens. I'm using a script called autorandr for switching between display modes - it uses xrandr. It tries to run:
xrandr --output DP1-1 --gamma 1.0:1.0:1.0 --mode 1920x1200 --panning 0x0 --pos 0x0 --rate 59.95 --reflect normal --rotate normal --output DP1-2 --gamma 1.0:1.0:1.0 --mode 1920x1200 --panning 0x0 --pos 1920x0 --rate 59.95 --reflect normal --rotate normal
But the X server responds with:
X Error of failed request: BadMatch (invalid parameter attributes)  Major opcode of failed request: 140 (RANDR)  Minor opcode of failed request: 21 (RRSetCrtcConfig)  Serial number of failed request: 48  Current serial number in output stream: 48
Running this exact command after booting in the dock is doing the right thing, but after undocking then docking, it doesn't work.
Any ideas here? I have updated to the latest BIOS version.
Problem also reported in launchpad with lot's of debug info, here:
bugs.launchpad.net/.../1585884
Autorandr script is here: github.com/.../

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Hello Everyone,
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Thanks in advance,
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Tech Support Guy System Info Utility version 1.0.0.2
OS Version: Microsoft Windows XP Professional, Service Pack 3, 32 bit
Processor: Intel(R) Core(TM)2 CPU 6400 @ 2.13GHz, x86 Family 6 Model 15 Stepping 6
Processor Count: 2
RAM: 3070 Mb
Graphics Card: NVIDIA GeForce 6200 LE, 512 Mb
Hard Drives: C: Total - 232048 MB, Free - 150174 MB; D: Total - 6404 MB, Free - 1505 MB;
Motherboard: ASUSTek Computer INC., Basswood
Antivirus: PC Cleaner Pro, Updated: Yes, On-Demand Scanner: Disabled
&n... Read more

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