Can also reproduce with a test installation of standard Ubuntu 26.04 (with GNOME), edited title and description accordingly.
** Description changed: - Since the kernel upgrade to 7.0.0-7-generic, my test installation of Kubuntu 26.04 hangs with a flickering screen when I resume my PC from suspend-to-RAM. + Since the kernel upgrade to 7.0.0-7-generic, my test installations of Kubuntu and Ubuntu 26.04 hang with a flickering screen when I resume my PC from suspend-to-RAM. This is a regression from linux 6.19.0-9-generic. STEPS TO REPRODUCE - 1. Boot Kubuntu 26.04 with kernel 7.0.0-7-generic, login to KDE Plasma Desktop. + 1. Boot Kubuntu or Ubuntu 26.04 with kernel 7.0.0-7-generic, login to Desktop. 2. Suspend-to-RAM. 3. Power on again. ACTUAL RESULT PC hangs with flickering screen (sample video attached below). Key presses, like for opening a TTY or Ctrl+Alt+Delete, do nothing. Only exception: SysRq+B for rebooting the machine still works. EXPECTED RESULT Suspend works :) ADDITIONAL INFORMATION If I boot the older kernel 6.19.0-9-generic, suspend works just fine, so it seems like a regression in 7.0.0-7-generic. I have disabled the KDE screen locker. ProblemType: Bug DistroRelease: Ubuntu 26.04 Package: linux-image-7.0.0-7-generic 7.0.0-7.7 ProcVersionSignature: Ubuntu 7.0.0-7.7-generic 7.0.0-rc3 Uname: Linux 7.0.0-7-generic x86_64 ApportVersion: 2.33.1-0ubuntu4 Architecture: amd64 CasperMD5CheckResult: unknown CurrentDesktop: KDE Date: Sat Mar 21 12:41:35 2026 InstallationDate: Installed on 2026-03-05 (16 days ago) InstallationMedia: Kubuntu 26.04 LTS "Resolute Raccoon" - Daily amd64 (20260301) MachineType: ASUS System Product Name ProcFB: 0 amdgpudrmfb ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-7.0.0-7-generic root=UUID=542ff2d9-34c9-43b5-a08f-b3751680c912 ro rootflags=subvol=@ quiet splash PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon. RfKill: - + SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 01/04/2026 dmi.bios.release: 5.17 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: 3636 dmi.board.asset.tag: Default string dmi.board.name: PRIME A520M-E dmi.board.vendor: ASUSTeK COMPUTER INC. dmi.board.version: Rev X.0x dmi.chassis.asset.tag: Default string dmi.chassis.type: 3 dmi.chassis.vendor: Default string dmi.chassis.version: Default string dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr3636:bd01/04/2026:br5.17:svnASUS:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnPRIMEA520M-E:rvrRevX.0x:cvnDefaultstring:ct3:cvrDefaultstring:skuSKU:pfaTobefilledbyO.E.M.: dmi.product.family: To be filled by O.E.M. dmi.product.name: System Product Name dmi.product.sku: SKU dmi.product.version: System Version dmi.sys.vendor: ASUS ** Summary changed: - Regression: Kubuntu 26.04 with kernel 7.0.0-7-generic hangs at resume from suspend with flickering screen + Regression: Ubuntu 26.04 with kernel 7.0.0-7-generic hangs at resume from suspend with flickering screen -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2145078 Title: Regression: Ubuntu 26.04 with kernel 7.0.0-7-generic hangs at resume from suspend with flickering screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2145078/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
