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. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/2065096 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 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2065096/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
