Explicitly specify `--crtc` in `mon` `xrandr` cmd
Explicitly specify `--crtc` in `mon` `xrandr` cmd

Without explicitly specifying this, on my ThinkPad dock, `xrandr` fails
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:  44
      Current serial number in output stream:  44

And, with `--dry`, it appears to be placing both external monitors at
the same position (`+0+0`), despite explicit `--pos` arguments (`0x0`
and `1920x0`).

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