FWIW, this bug caused G-SYNC to not work in games for me (the G-SYNC
indicator said NORMAL instead of G-SYNC), while nvidia-settings reported
G-SYNC was active. Using the kernel parameter resolved this issue and
also the "unknown display" went away.
However, this must be caused by a recent change to my system because
G-SYNC was working fine before without using the kernel param.
Unfortunately, I did not find out yet which change exactly caused G-SYNC
to stop working.
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https://bugs.launchpad.net/bugs/2060268
Title:
Phantom "Unknown Display" shown in Settings after installing the
Nvidia driver
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