This might not be a bug... Because X11 fractional scaling is implemented
using an extra-large screen buffer and copying it (scaled down) to the
real framebuffer. Both of those facts make Xorg fractional scaling much
slower than integer scaling. Wayland fractional scaling has no such
performance problems but the Nvidia driver is not well supported with
Wayland :(
I suggest your best options are either:
* Don't use fractional scaling at all; or
* Enable experimental Nvidia Wayland support:
1. In /etc/default/grub add the kernel parameter: nvidia-
drm.modeset=1
2. Comment out the Nvidia rule that is disabling Wayland in
/usr/lib/udev/rules.d/61-gdm.rules
** Changed in: mutter (Ubuntu)
Status: New => Won't Fix
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https://bugs.launchpad.net/bugs/1907189
Title:
Apps become unresponsive and lag when multiple windows opened and
fractional scaling enabled
Status in mutter package in Ubuntu:
Won't Fix
Bug description:
When I open an application like Firefox, I split them into 2 windows
and place one to the left and place the other to the right. So each
window gets half of the monitor. The right window gets slow when
clicking and lags for 2 seconds. But the left window is normal. This
happens to all applications when I have 2 windows. (When 1 window
only, even if I put it to the right side of the monitor, it still
works fine, no lag). Thank you!
ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu14
ProcVersionSignature: Ubuntu 5.4.0-56.62-generic 5.4.73
Uname: Linux 5.4.0-56-generic x86_64
.tmp.unity_support_test.0:
ApportVersion: 2.20.11-0ubuntu27.13
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckResult: skip
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Mon Dec 7 19:33:24 2020
DistUpgraded: Fresh install
DistroCodename: focal
DistroVariant: ubuntu
DkmsStatus:
nvidia, 450.80.02, 5.4.0-54-generic, x86_64: installed
nvidia, 450.80.02, 5.4.0-56-generic, x86_64: installed
ExtraDebuggingInterest: Yes, including running git bisection searches
GraphicsCard:
Intel Corporation HD Graphics 630 [8086:591b] (rev 04) (prog-if 00 [VGA
controller])
Subsystem: Dell HD Graphics 630 [1028:07be]
Subsystem: Dell GP107M [GeForce GTX 1050 Mobile] [1028:07be]
InstallationDate: Installed on 2020-06-23 (167 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
Lsusb:
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 0cf3:e301 Qualcomm Atheros Communications
Bus 001 Device 002: ID 2f68:0082 Hoksi Technology DURGOD Taurus K320
Bus 001 Device 004: ID 0c45:6713 Microdia Integrated_Webcam_HD
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: Dell Inc. XPS 15 9560
ProcEnviron:
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-56-generic
root=UUID=30757229-adcc-4567-bf22-0a375e36d51d ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
Title: Xorg freeze
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/21/2020
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.20.0
dmi.board.name: 0JHP5H
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvr1.20.0:bd07/21/2020:svnDellInc.:pnXPS159560:pvr:rvnDellInc.:rn0JHP5H:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.family: XPS
dmi.product.name: XPS 15 9560
dmi.product.sku: 07BE
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.14.1+20.04.20200211-0ubuntu1
version.libdrm2: libdrm2 2.4.101-2
version.libgl1-mesa-dri: libgl1-mesa-dri 20.0.8-0ubuntu1~20.04.1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2.6
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel
2:2.99.917+git20200226-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1
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