[Bug 2065096] Re: [i915] Display is Laggy/Unresponsive when PSR is enabled

I also have a Latitude 9430 and I can confirm the exact same behaviour.
While I didn't try Ubuntu 20.04 where it supposedly doesn't happen, I
can add that it happens in Fedora 41 as well.

The "fix" is exactly as the author describes, disabling panel self
refresh in grub.

Though it's unclear how much of an impact this creates on battery life.

This bug essentially renders Ubuntu/Linux distros completely unusable on
this machine (and possibly others like 9440, 9450 or in authors case
7430...) unless you are highly tech savvy.

Please fix.

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Title:
[i915] Display is Laggy/Unresponsive when PSR is enabled

Status in linux package in Ubuntu:
Confirmed

Bug description:
I have Dell Latitude 7430 and 9430 laptops. Both are affected by the
same issue.

When using Ubuntu 22.04 or Ubuntu 24.04 with the default configuration
the in-built display of the laptop is laggy and unresponsive. External
displays are unaffected. The issue does not occur in Ubuntu 20.04.

I believe the issue is with the Intel Panel Self Refresh (PSR).

I was able to employ a workaround that resolves the issue by adding
"i915.enable_psr=0" to grub, as per this thread:
https://ubuntuforums.org/showthread.php?t=2497326

ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: xorg 1:7.7+23ubuntu3
ProcVersionSignature: Ubuntu 6.8.0-31.31-generic 6.8.1
Uname: Linux 6.8.0-31-generic x86_64
ApportVersion: 2.28.1-0ubuntu2
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckResult: pass
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Tue May 7 20:54:19 2024
DistUpgraded: Fresh install
DistroCodename: noble
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
Intel Corporation Alder Lake-UP3 GT2 [Iris Xe Graphics] [8086:46a8] (rev 0c) (prog-if 00 [VGA controller])
Subsystem: Dell Alder Lake-UP3 GT2 [Iris Xe Graphics] [1028:0b0b]
InstallationDate: Installed on 2024-04-30 (7 days ago)
InstallationMedia: Ubuntu 24.04 LTS "Noble Numbat" - Release amd64 (20240424)
MachineType: Dell Inc. Latitude 7430
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-6.8.0-31-generic root=/dev/mapper/ubuntu--vg-ubuntu--lv ro quiet splash i915.enable_psr=0 vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/31/2024
dmi.bios.release: 1.21
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.21.0
dmi.board.name: 0HMKCM
dmi.board.vendor: Dell Inc.
dmi.board.version: A01
dmi.chassis.asset.tag: 13014441
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.21.0:bd01/31/2024:br1.21:svnDellInc.:pnLatitude7430:pvr:rvnDellInc.:rn0HMKCM:rvrA01:cvnDellInc.:ct10:cvr:sku0B0B:
dmi.product.family: Latitude
dmi.product.name: Latitude 7430
dmi.product.sku: 0B0B
dmi.sys.vendor: Dell Inc.
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.120-2build1
version.libgl1-mesa-dri: libgl1-mesa-dri 24.0.5-1ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:21.1.12-1ubuntu1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:22.0.0-1build1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20210115-1build1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.17-2build1

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