Multiple different display refresh rates lead to the lowest one being chosen for rendering the window animations

[Muhammed Ali Geldi]

I have two different monitors hooked up. One has a 60 Hz refresh rate, the other one has a 144 Hz
one. I did make sure to select the correct resolution and refresh rate for booth.

The issue is that any objects on the desktop environment such as windows (browsers, file managers, terminals), basically, every graphical part of the screen, get rendered in 60 frames per second, in stead of the correct 144 frames per second.

This is very easily repeatable if you have two monitors with two refresh rates, I suppose. After you set up your monitors, make sure to enable 144 Hz, then "test" it by moving your mouse around. It should feel smooth, just like it should on 144 Hz. Now move a window (such as a browser, or your file manager) around. You should notice that it still feels like it runs at 60 Hz.

To sum up:
What should happen:
- The windows that are currently on the 144 Hz Monitor should be rendered at the specified refresh rate
What actually happens
- The refresh rate of rendered windows (excluding games) appears to be capped to the lowest refresh rate monitor

I did test this further and it seemed to confirm my hypothesis. When I set my second, 60 Hz monitor, to run at 30 Hz, everything excluding my cursor was now being rendered at 30 Hz on both screens.

ProblemType: Bug
DistroRelease: Ubuntu 19.04
Package: xorg 1:7.7+19ubuntu12
ProcVersionSignature: Ubuntu 5.0.0-20.21-generic 5.0.8
Uname: Linux 5.0.0-20-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
.proc.driver.nvidia.gpus.0000.03.00.0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/0000:03:00.0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86_64 Kernel Module 418.56 Fri Mar 15 12:59:26 CDT 2019
 GCC version: gcc version 8.3.0 (Ubuntu 8.3.0-6ubuntu1)
ApportVersion: 2.20.10-0ubuntu27.1
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Sun Jul 21 19:47:07 2019
DistUpgraded: Fresh install
DistroCodename: disco
DistroVariant: ubuntu
DkmsStatus:
 nvidia, 418.56, 5.0.0-13-generic, x86_64: installed
 nvidia, 418.56, 5.0.0-20-generic, x86_64: installed
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
 NVIDIA Corporation GP104 [GeForce GTX 1080] [10de:1b80] (rev a1) (prog-if 00 [VGA controller])
   Subsystem: Micro-Star International Co., Ltd. [MSI] GP104 [GeForce GTX 1080] [1462:3362]
InstallationDate: Installed on 2019-07-16 (4 days ago)
InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
MachineType: MSI MS-7885
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.0.0-20-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=1
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/15/2018
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 1.E0
dmi.board.asset.tag: Default string
dmi.board.name: X99A SLI PLUS(MS-7885)
dmi.board.vendor: MSI
dmi.board.version: 1.0
dmi.chassis.asset.tag: Default string
dmi.chassis.type: 3
dmi.chassis.vendor: MSI
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr1.E0:bd06/15/2018:svnMSI:pnMS-7885:pvr1.0:rvnMSI:rnX99ASLIPLUS(MS-7885):rvr1.0:cvnMSI:ct3:cvr1.0:
dmi.product.family: Default string
dmi.product.name: MS-7885
dmi.product.sku: Default string
dmi.product.version: 1.0
dmi.sys.vendor: MSI
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.97-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 19.0.2-1ubuntu1.1
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 2:1.20.4-1ubuntu3
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.0.1-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20180925-2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

[Daniel van Vugt (vanvugt)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 1820832, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.