HiDPI mode is reset per-window after sleep

[sophiajt]

Distribution (run cat /etc/os-release):

NAME="Pop!_OS" VERSION="19.10" ID=ubuntu ID_LIKE=debian PRETTY_NAME="Pop!_OS 19.10" VERSION_ID="19.10" HOME_URL="https://system76.com/pop" SUPPORT_URL="http://support.system76.com" BUG_REPORT_URL="https://github.com/pop-os/pop/issues" PRIVACY_POLICY_URL="https://system76.com/privacy" VERSION_CODENAME=eoan UBUNTU_CODENAME=eoan LOGO=distributor-logo-pop-os

Issue/Bug Description:

When I wake either my desktop/laptop running pop! OS, if they were configured to run at 200% scaling HiDPI mode, initially after waking Windows (often Firefox windows) have been reset to 100% scaling. To fix, the windows need to be moved or resized.

Similar to:

• https://github.com/pop-os/pop/issues/601
• https://github.com/pop-os/pop/issues/769

Steps to reproduce (if you know):

• Use 200% scaling HiDPI on a 3840 x 2160 monitor
• Sleep the machine
• Wake the machine and log back in

Expected behavior:

Scaling should stay at 200% for all Windows

[FiretronP75]

I had the opposite problem. I set my 3840 x 2160 monitor to 100% and after waking it changed to 200%