Till Kamppeter, as per
http://support.lenovo.com/en_US/downloads/default.page? an update is
available for your BIOS (1.57). If you update to this, does it change
anything?

If not, could you please both specify what happened, and provide the output of 
the following terminal command:
sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date

Thank you for your understanding.

** Summary changed:

- REGRESSION: Mirroring display works only with 1024x768 (4:3) resolution 
whereas my laptop has 1366x768 (16:9) and the external monitor 1920x1080 (16:9)
+ [ThinkPad Twist S230u 3347] REGRESSION: Mirroring display works only with 
1024x768 (4:3) whereas my laptop has 1366x768 (16:9) & external monitor 
1920x1080 (16:9)

** Tags added: bios-outdated-1.57 needs-upstream-testing regression-
potential

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xorg-server in Ubuntu.
https://bugs.launchpad.net/bugs/1167301

Title:
  [ThinkPad Twist S230u 3347] REGRESSION: Mirroring display works only
  with 1024x768 (4:3) whereas my laptop has 1366x768 (16:9) & external
  monitor 1920x1080 (16:9)

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