Public bug reported: 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 ** Affects: xorg (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug noble performance ubuntu wayland-session -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2065096 Title: Display is Laggy/Unresponsive To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/2065096/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
