Blurry when using fractional scaling on HiDPI.

[np]

I'm using join-display with an built-in laptop HiDPI screen and an external 1920x1080 screens. I set fractional scaling 200% on HiDPI one and 100% on 1920x1080 one.

The emacs window on 1920x1080 screen displays clearly, but blurs on the HiDPI one.

If I switched to non-fractional scaling(still 200%, 100%), then it does not blur, but only the top-left area of my HiDPI screen displays while the remaining area is black.

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: emacs 1:27.1+1-3ubuntu5
ProcVersionSignature: Ubuntu 5.15.0-23.23-generic 5.15.27
Uname: Linux 5.15.0-23-generic x86_64
ApportVersion: 2.20.11-0ubuntu80
Architecture: amd64
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Sat Apr 2 11:50:31 2022
InstallationDate: Installed on 2022-02-15 (46 days ago)
InstallationMedia: Ubuntu 20.04.3 LTS "Focal Fossa" - Release amd64 (20210819)
PackageArchitecture: all
SourcePackage: emacs
UpgradeStatus: Upgraded to jammy on 2022-04-02 (0 days ago)