Public bug reported:
I'm using Ubuntu 20.04.1, on a Lenovo Thinkpad T14s. I've got fractional
scaling enabled (125%) with Gnome.
I regularly plug into an external monitor with an HDMI connection, and
run both screens (the external monitor and the built-in laptop one)
side-by-side. With that setup, I don't use fractional scaling, because
my main external monitor is easier to read.
When I unplug the HDMI cord from my external monitor to go back to
working on the laptop, sometimes the bottom half of the laptop screen
goes black. The mouse cursor is still visible if I move it to that
region, but nothing is visible in the entire lower portion of my screen.
I've been running 20.04 on this laptop since last August, and it didn't
used to be a problem. The problem first occurred perhaps a month or two
ago, but was rare and sporadic. It has been happening more and more
frequently, and is now at the point that most of the time this problem
occurs.
Once I have unplugged the cable and I'm stuck with a black bottom half
of the screen, I can resolve it by disabling fractional scaling, but of
course, that disables fractional scaling. At that point, any attempts to
reenable fractional scaling either bring the black region back again, or
start causing all kinds of other instabilities. Restarting Gnome at this
point contributes to the mess. The only stable workaround I've found
(apart from rebooting) is to plug the laptop back into the external
monitor again, switch the configuration to single display mode, and then
unplug. This works but is of course cumbersome.
Is there more information I can supply that would be useful?
** Affects: mutter (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1913742
Title:
Fractional scaling: bottom half of screen black on external monitor
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