I think I have found the culprit:

till@till-twist:~/kernel/linux-stable$ git bisect good
Bisecting: 4 revisions left to test after this (roughly 2 steps)
[740922ee575f8ee4daa2bfd3db5f69dd7573fc76] drm: don't add inferred modes for 
monitors that don't support them
till@till-twist:~/kernel/linux-stable$ 

The extra modes in reality work with the monitor, and they give extra
chances to find a best match between laptop screen and external
monitor/projector.

Anyway, I will continue the bisect to confirm ...

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https://bugs.launchpad.net/bugs/1167301

Title:
  8086:0166 [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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