[nvidia] fractional display scale cannot work properly

[Guo Le]

When I switch on fractional scaling, and choose 125%/150%/175%, everything gets very large. The screen can only display part of the whole desktop. It is even larger than the 200%-scale.

P.S.
As I remember, the fractional scaling works well in May. But after a update in May (forgot the exact date), fractional scaling cannot work properly anymore. After that update, I can just use 200% scale setting. I'm so sorry to report this bug so late.
Also, I tested both with only the builtin screen and with an external monitor in 'Join Display' mode.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu14
ProcVersionSignature: Ubuntu 5.4.0-54.60-generic 5.4.65
Uname: Linux 5.4.0-54-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
.proc.driver.nvidia.capabilities.gpu0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/capabilities/gpu0'
.proc.driver.nvidia.capabilities.mig: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/capabilities/mig'
.proc.driver.nvidia.gpus.0000.02.00.0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/0000:02:00.0'
.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 450.80.02 Wed Sep 23 01:13:39 UTC 2020
 GCC version: gcc version 9.3.0 (Ubuntu 9.3.0-17ubuntu1~20.04)
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: Thu Nov 26 09:54:20 2020
DistUpgraded: Fresh install
DistroCodename: focal
DistroVariant: ubuntu
DkmsStatus:
 nvidia, 450.80.02, 5.4.0-53-generic, x86_64: installed
 nvidia, 450.80.02, 5.4.0-54-generic, x86_64: installed
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
 Intel Corporation UHD Graphics 620 (Whiskey Lake) [8086:3ea0] (rev 02) (prog-if 00 [VGA controller])
   Subsystem: Huawei Technologies Co., Ltd. UHD Graphics 620 (Whiskey Lake) [19e5:3e0c]
   Subsystem: Huawei Technologies Co., Ltd. GP108M [GeForce MX250] [19e5:3e0c]
InstallationDate: Installed on 2020-05-02 (207 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 13d3:56db IMC Networks ov9734_azurewave_camera
 Bus 001 Device 002: ID 046d:c077 Logitech, Inc. M105 Optical Mouse
 Bus 001 Device 004: ID 8087:0aaa Intel Corp.
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: HUAWEI HBL-WX9
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-54-generic root=UUID=b1d9a025-3f1d-4fad-844f-c4e836944847 ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 08/12/2019
dmi.bios.vendor: HUAWEI
dmi.bios.version: 1.09
dmi.board.asset.tag: NULL
dmi.board.name: HBL-WX9-PCB
dmi.board.vendor: HUAWEI
dmi.board.version: M1130
dmi.chassis.asset.tag: NULL
dmi.chassis.type: 10
dmi.chassis.vendor: HUAWEI
dmi.chassis.version: M1130
dmi.modalias: dmi:bvnHUAWEI:bvr1.09:bd08/12/2019:svnHUAWEI:pnHBL-WX9:pvrM1130:rvnHUAWEI:rnHBL-WX9-PCB:rvrM1130:cvnHUAWEI:ct10:cvrM1130:
dmi.product.family: MagicBook
dmi.product.name: HBL-WX9
dmi.product.sku: C233
dmi.product.version: M1130
dmi.sys.vendor: HUAWEI
version.compiz: compiz N/A
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.nvidia-graphics-drivers: nvidia-graphics-drivers-* N/A
version.xserver-xorg-core: xserver-xorg-core 2:1.20.8-2ubuntu2.4
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

[Daniel van Vugt (vanvugt)]

Please reproduce the problem again, and while it is happening run this command in a terminal:

  xrandr --verbose > xrandr2.txt

and attach the resulting text file.

[Guo Le (timguole)]

I just reproduced the problem. One more detail I want to say, both my builtin display and the external monitor's resolution are 1920x1080

[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 1870736, 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.