Oh! I got it, Thanks a lot!
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https://bugs.launchpad.net/bugs/1928294
Title:
gamma adjustment not working
Status in xorg-server package in Ubuntu:
Invalid
Bug description:
Used "xgamma -gamma" but it's not changing the gamma value although
it's executing successfully. The gamma value is remaining the same as
it's been before. The same problem is persisting with "xrandr".
ProblemType: Bug
DistroRelease: Ubuntu 21.04
Package: xorg 1:7.7+22ubuntu1
ProcVersionSignature: Ubuntu 5.11.0-17.18-generic 5.11.12
Uname: Linux 5.11.0-17-generic x86_64
ApportVersion: 2.20.11-0ubuntu65
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckResult: unknown
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Thu May 13 10:50:09 2021
DistUpgraded: 2021-05-13 01:05:27,602 DEBUG icon theme changed, re-reading
DistroCodename: hirsute
DistroVariant: ubuntu
DkmsStatus:
virtualbox, 6.1.18, 5.11.0-17-generic, x86_64: installed
virtualbox, 6.1.18, 5.8.0-53-generic, x86_64: installed
ExtraDebuggingInterest: Yes
GraphicsCard:
Intel Corporation TigerLake GT2 [Iris Xe Graphics] [8086:9a49] (rev 01)
(prog-if 00 [VGA controller])
Subsystem: Dell Iris Xe Graphics [1028:0a01]
InstallationDate: Installed on 2021-01-16 (116 days ago)
InstallationMedia: Ubuntu 20.10 "Groovy Gorilla" - Release amd64 (20201022)
MachineType: Dell Inc. Inspiron 5402
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.11.0-17-generic
root=UUID=27db7e67-d3d7-4151-9a09-55ec9d0801fd ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to hirsute on 2021-05-12 (0 days ago)
dmi.bios.date: 03/30/2021
dmi.bios.release: 1.4
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.4.1
dmi.board.name: 0NTCD9
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvr1.4.1:bd03/30/2021:br1.4:svnDellInc.:pnInspiron5402:pvr:rvnDellInc.:rn0NTCD9:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.family: Inspiron
dmi.product.name: Inspiron 5402
dmi.product.sku: 0A01
dmi.sys.vendor: Dell Inc.
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.104-1build1
version.libgl1-mesa-dri: libgl1-mesa-dri 21.0.1-2
version.libgl1-mesa-glx: libgl1-mesa-glx 21.0.1-2
version.xserver-xorg-core: xserver-xorg-core 2:1.20.11-1ubuntu1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-2
version.xserver-xorg-video-intel: xserver-xorg-video-intel
2:2.99.917+git20200714-1ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.17-1
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