You have been subscribed to a public bug:
With a multi monitor setup, all desktop backgrounds will be down scaled
to match the built in display on a laptop (possibly the default display
on any setup), resulting in blurred wallpapers on high resolution
external monitors.
deactivating the built in display will show background in full
resolution on an external monitor, and eventually enabling the built in
display again, will show both backgrounds at full resolution again.
however, after a reboot/login, the external display background is
downscaled again.
attached files show what a high resolution external display looks like
if the built in display has a very low resolution.
to re-create:
must have dual monitor setup.
set screen resolution on default display (laptop) to very low
set resolution to external display to a very high resolution
apply a desktop background
save
login/logout
** Affects: ayatana-design
Importance: Undecided
Status: New
** Affects: unity (Ubuntu)
Importance: Undecided
Status: New
** Tags: background display multi resolution wallpapers
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desktop background wrong resolution on multi monitor setup
https://bugs.launchpad.net/bugs/1650180
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