*** This bug is a duplicate of bug 1968040 ***
https://bugs.launchpad.net/bugs/1968040
Thanks for the bug report.
It looks likely that both displays are connected to the Intel GPU. And
the recurring messages in the system log explain why one of them is
blank:
Failed to post KMS update: drmModeAtomicCommit: Invalid argument
Page flip discarded: drmModeAtomicCommit: Invalid argument
So I think this is a duplicate of bug 1968040.
** This bug has been marked a duplicate of bug 1968040
Blanked screen doesn't wake up after locking [drmModeAtomicCommit: Argument
invalide] [drmModeAtomicCommit: Invalid argument]
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https://bugs.launchpad.net/bugs/2002453
Title:
wayland external monitor turned off for second user
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