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I have a laptop with built in display 2560 x 1600 resolution. So for this 
display I need to set the scaling to 125% otherwise the fonts are too small, 
practically unreadable. 
Then, I am connecting external display with resolution 2560 x 1440 for which I 
want to set the font scaling to 100%.

Attempting to change the font scales results in:

- font scaling cannot be set different for each display
- when the font scaling is set to 100 % it is ok
- when the font scaling is set to 125 % for laptop (primary) display this 
affects both displays, the settings form starts to generate artifacts and 
becomes partially non-responsible (settings need to be restarted)
- when the font scaling is set to 125% on external display, this leads to 
improper font scaling (200%)
- fractional scaling was enabled in all cases

Summary:

- non-responsive Settings when font scaling is changed
- improper scaling on external display
- scaling cannot be set differently for attached displays

Ubuntu 24.04.2 LTS

ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: xorg 1:7.7+23ubuntu3
ProcVersionSignature: Ubuntu 6.11.0-26.26~24.04.1-generic 6.11.11
Uname: Linux 6.11.0-26-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
.proc.driver.nvidia.capabilities.gpu0: Error: path was not a regular file.
.proc.driver.nvidia.capabilities.mig: Error: path was not a regular file.
.proc.driver.nvidia.gpus.0000.01.00.0: Error: path was not a regular file.
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.suspend: suspend hibernate resume
.proc.driver.nvidia.suspend_depth: default modeset uvm
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module  535.230.02  Fri Dec 20 
21:42:05 UTC 2024
 GCC version:
ApportVersion: 2.28.1-0ubuntu3.7
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckResult: pass
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Tue Jun 10 07:52:01 2025
DistUpgraded: Fresh install
DistroCodename: noble
DistroVariant: ubuntu
ExtraDebuggingInterest: No
GraphicsCard:
 Intel Corporation TigerLake-H GT1 [UHD Graphics] [8086:9a60] (rev 01) (prog-if 
00 [VGA controller])
   Subsystem: Acer Incorporated [ALI] TigerLake-H GT1 [UHD Graphics] [1025:1532]
 NVIDIA Corporation GA104M [GeForce RTX 3070 Mobile / Max-Q] [10de:24dd] (rev 
a1) (prog-if 00 [VGA controller])
   Subsystem: Acer Incorporated [ALI] GA104M [GeForce RTX 3070 Mobile / Max-Q] 
[1025:1532]
InstallationDate: Installed on 2024-08-18 (295 days ago)
InstallationMedia: Ubuntu 24.04 LTS "Noble Numbat" - Release amd64 (20240424)
MachineType: Acer Predator PT516-51s
ProcEnviron:
 LANG=en_US.UTF-8
 PATH=(custom, no user)
 SHELL=/bin/bash
 XDG_RUNTIME_DIR=<set>
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.11.0-26-generic 
root=UUID=f36691e7-93b9-4bf9-b2b8-8f1faf08bc09 ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/06/2022
dmi.bios.release: 1.7
dmi.bios.vendor: Insyde Corp.
dmi.bios.version: V1.07
dmi.board.asset.tag: Type2 - Board Asset Tag
dmi.board.name: Countryman_TLS
dmi.board.vendor: TGL
dmi.board.version: V1.07
dmi.chassis.type: 10
dmi.chassis.vendor: Acer
dmi.chassis.version: V1.07
dmi.ec.firmware.release: 1.6
dmi.modalias: 
dmi:bvnInsydeCorp.:bvrV1.07:bd06/06/2022:br1.7:efr1.6:svnAcer:pnPredatorPT516-51s:pvrV1.07:rvnTGL:rnCountryman_TLS:rvrV1.07:cvnAcer:ct10:cvrV1.07:sku0000000000000000:
dmi.product.family: Predator Triton 500 SE
dmi.product.name: Predator PT516-51s
dmi.product.sku: 0000000000000000
dmi.product.version: V1.07
dmi.sys.vendor: Acer
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.122-1~ubuntu0.24.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 24.2.8-1ubuntu1~24.04.1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core 2:21.1.12-1ubuntu1.3
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:22.0.0-1build1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20210115-1build1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.17-2build1

** Affects: mutter (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug noble ubuntu xrandr-scaling
-- 
Wrong font scaling with multiple displays
https://bugs.launchpad.net/bugs/2113859
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