after my laptop-screen goes off (automatic locking of workstation) and i
retouched it to go on again, i see some flickering on the external
monitor with background-image, but it looks like there was heavy load so
that login-screen wasn't displayed (see also background on internal
screen)...have now switched off external monitor to get login-window
again...maybe this helps to get the issue nailed down

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https://bugs.launchpad.net/bugs/1878421

Title:
  Using two GPUs with one monitor each, one is always black

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