Greeter screen resolution too small for USB monitors (multiseat)

Sometimes, but not always, I get this error message (also see screenshot):

Could not apply the stored configuration for monitors
required virtual size does not fit available size: requested=(1, 1), minimum=(320, 200), maximum=(800, 480)

Sorry to bump around this bug but I'm going to reassign this to the X server. LightDM and Unity Greeter don't change the default X settings so this is probably a case of misconfiguration or X setting a bad default.

Status changed to 'Confirmed' because the bug affects multiple users.

Same problem here with a Plugable USB Display Adapter using displaylink driver in xorg. I attach my xorg.conf and lightdm.conf

Is this maybe related to bug #780791 ?

I used the workaround from bug #780791 to get rid of this problem in precise:

Create file /usr/local/bin/dl-workaround.sh with following content:

#! /bin/bash

XRANDR=`which xrandr`
if [ "x$XRANDR" != "x" ]; then
  $XRANDR -o 0
fi

Then execute sudo chmod +x /usr/local/bin/dl-workaround.sh and put the following line into /etc/lightdm/lightdm.conf in the section responsible for the usb-seat:

display-setup-script=/usr/local/bin/dl-workaround.sh

Michael Franzl, this bug was reported a while ago and there hasn't been any activity in it recently. We were wondering if this is still an issue? If so, could you please test for this with the latest development release of Ubuntu? ISO images are available from http://cdimage.ubuntu.com/daily-live/current/ .

If it remains an issue, could you please run the following command in the development release from a Terminal (Applications->Accessories->Terminal), as it will automatically gather and attach updated debug information to this report:

apport-collect -p xorg-server REPLACE-WITH-BUG-NUMBER

Please note, given that the information from the prior release is already available, doing this on a release prior to the development one would not be helpful.

Thank you for your understanding.

Helpful bug reporting tips:
https://wiki.ubuntu.com/ReportingBugs

[Expired for xorg-server (Ubuntu) because there has been no activity for 60 days.]