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I have three monitors arranged horizontally left-to-right, with
fractional scaling enabled in Xorg mode (not Wayland):
#1: laptop, 3840x2400 native, scaled at 225%
#2: external monitor 1, 3840x2160 native, scaled at 150% (main display)
#3: external monitor 2, 3840x2160 native, scaled at 150%
In this setup, a little more than half of the rightmost monitor is
truncated black.
I suspect it is caused by oversampled screens (fractional scaling) not
fitting into the maximum framebuffer size of 16384x16384, as evidenced
by the following xrandr(1):
$ xrandr | awk '/^[^ ]/ && $2 != "disconnected"'
Screen 0: minimum 320 x 200, current 16384 x 4320, maximum 16384 x 16384
eDP-1 connected 5112x3195+0+0 (normal left inverted right x axis y axis) 366mm
x 229mm
DP-2 connected primary 7680x4320+5112+0 (normal left inverted right x axis y
axis) 597mm x 336mm
DP-3 connected 7680x4320+12792+0 (normal left inverted right x axis y axis)
597mm x 336mm
ProblemType: Bug
DistroRelease: Ubuntu 23.04
Package: xserver-xorg 1:7.7+23ubuntu2
ProcVersionSignature: Ubuntu 6.2.0-20.20-generic 6.2.6
Uname: Linux 6.2.0-20-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia zfs zunicode zavl icp zcommon
znvpair
.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 525.105.17 Tue Mar 28
18:02:59 UTC 2023
GCC version:
ApportVersion: 2.26.1-0ubuntu2
Architecture: amd64
CasperMD5CheckResult: unknown
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Fri Apr 21 18:51:29 2023
DistUpgraded: 2023-04-20 13:31:05,017 DEBUG Running PostInstallScript:
'/usr/lib/ubuntu-advantage/upgrade_lts_contract.py'
DistroCodename: lunar
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, including running git bisection searches
GraphicsCard:
Intel Corporation Alder Lake-P Integrated Graphics Controller [8086:46a6] (rev
0c) (prog-if 00 [VGA controller])
Subsystem: Dell Alder Lake-P Integrated Graphics Controller [1028:0aff]
NVIDIA Corporation GA106M [GeForce RTX 3060 Mobile / Max-Q] [10de:2520] (rev
a1) (prog-if 00 [VGA controller])
Subsystem: Dell GA106M [GeForce RTX 3060 Mobile / Max-Q] [1028:0aff]
MachineType: Dell Inc. XPS 17 9720
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
XDG_RUNTIME_DIR=<set>
ProcKernelCmdLine: BOOT_IMAGE=/BOOT/ubuntu_bm2y56@/vmlinuz-6.2.0-20-generic
root=ZFS=rpool/ROOT/ubuntu_bm2y56 ro init_on_alloc=0
i915.enable_psr2_sel_fetch=0
SourcePackage: xorg
UpgradeStatus: Upgraded to lunar on 2023-04-20 (1 days ago)
dmi.bios.date: 03/20/2023
dmi.bios.release: 1.15
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.15.1
dmi.board.name: 0W7GHH
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvr1.15.1:bd03/20/2023:br1.15:svnDellInc.:pnXPS179720:pvr:rvnDellInc.:rn0W7GHH:rvrA00:cvnDellInc.:ct10:cvr:sku0AFF:
dmi.product.family: XPS
dmi.product.name: XPS 17 9720
dmi.product.sku: 0AFF
dmi.sys.vendor: Dell Inc.
mtime.conffile..etc.logrotate.d.apport: 2023-01-31T20:57:54.273339
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.114-1
version.libgl1-mesa-dri: libgl1-mesa-dri 23.0.2-1ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx 23.0.2-1ubuntu1
version.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core 2:21.1.7-1ubuntu3
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-3
version.xserver-xorg-video-intel: xserver-xorg-video-intel
2:2.99.917+git20210115-1
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 lunar ubuntu xrandr-scaling
--
Triple 4K monitor setup with fractional scaling truncated
https://bugs.launchpad.net/bugs/2017323
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