I've discovered another workaround, it works like this:
- booting with default arguments (without 'nomodeset')
- if on lightdm login screen goes blank, then attaching working external
monitor via miniHDMI->VGA adaptor makes screen on laptop visible again
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/991902
Title:
blinking blank screen after booting [asus zenbook ux21]
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