[Bug 2169236] Re: HDMI A/V desync on Intel UHD 630 (Comet Lake) since 7.0.0-34, still present on 7.0.0-38

Further testing, 2026-10-10. Another HWE kernel update. After a normal reboot into the new kernel, HDMI A/V was late again (same ~2 s, HDMI only, Aux fine). Switched back to 7.0.0-31: desync still present, same as the 2026-10-02 test. A reboot does not clear it. Full Sony power-off and HDMI unplug for 10 seconds cleared it on the new kernel as well. Same recovery as on 31 and 38. Summary: - First seen after 7.0.0-34. - Reproduced on 34, 38, and the current kernel after a normal reboot. - Once the Sony is in the bad state, it survives reboot and kernel switches (including back to 31). - Cleared on every kernel tested only by a full sink power-off and cable reseat. - 7.0.0-31 is not immune once the link is stuck; it only looked clean on 2026-09-29. This looks like an i915 HDMI bring-up change from 7.0.0-34 that leaves the sink with a sticky A/V offset. The unplug is a recovery, not evidence that the kernel is unrelated. -- You received this bug notification because you are subscribed to linux in Ubuntu. Matching subscriptions: Bgg, Bmail, Nb https://bugs.launchpad.net/bugs/2169236 Title: HDMI A/V desync on Intel UHD 630 (Comet Lake) since 7.0.0-34, still present on 7.0.0-38 Status in linux package in Ubuntu: Incomplete Bug description: Regression on Ubuntu 24.04 HWE kernels (Linux Mint 22.2). Hardware: - Intel CometLake-S GT2 UHD Graphics 630 (8086:9bc8), i915 - HDMI-1 to Sony TV, 1920x1080 - Analog Aux is unaffected Last good: 7.0.0-31-generic First bad: 7.0.0-34-generic Still bad: 7.0.0-38-generic On 34 and 38, HDMI video freezes about 5 seconds at start, then voice is about 2 seconds late. Firefox, Brave, and Celluloid all show it. Aux stays in sync. PipeWire latency offset does not change it. 7.0.0-31 is clean with the same Xorg (2:21.1.12-1ubuntu1.8), so this is not the Xorg update from 2026-09-29. ubuntu-bug linux refused the report: "This does not seem to be an official Linux package" on linux-image-7.0.0-38-generic (Mint). --- ProblemType: Bug ApportVersion: 2.28.3-0ubuntu0.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: brett 2067 F.... pipewire brett 2070 F.... wireplumber /dev/snd/pcmC0D3p: brett 2067 F...m pipewire /dev/snd/seq: brett 2067 F.... pipewire CRDA: N/A CasperMD5CheckMismatches: ./boot/grub/efi.img CasperMD5CheckResult: fail CurrentDesktop: i3 DistroRelease: Linux Mint 22.2 InstallationDate: Installed on 2025-12-25 (285 days ago) InstallationMedia: Linux Mint 22.2 "Zara" - Release amd64 20250828 MachineType: Micro-Star International Co., Ltd. MS-7D82 Package: linux (not installed) ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-38-generic root=UUID=8f09b6c5-7d43-4a10-a1a1-8f954eef5146 ro quiet splash ProcVersionSignature: Ubuntu 7.0.0-38.38~24.04.4-generic 7.0.14 PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: linux-restricted-modules-7.0.0-38-generic N/A linux-backports-modules-7.0.0-38-generic N/A linux-firmware 20240318.git3b128b60.0ubuntu3.1 RfKill: 0: hci0: Bluetooth Soft blocked: yes Hard blocked: no Tags: zara Uname: Linux 7.0.0-38-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: N/A _MarkForUpload: True dmi.bios.date: 03/26/2026 dmi.bios.release: 5.19 dmi.bios.vendor: American Megatrends International, LLC. dmi.bios.version: 1.71 dmi.board.asset.tag: Default string dmi.board.name: PRO H410M-B (MS-7D82) dmi.board.vendor: Micro-Star International Co., Ltd. dmi.board.version: 1.0 dmi.chassis.asset.tag: Default string dmi.chassis.type: 3 dmi.chassis.vendor: Micro-Star International Co., Ltd. dmi.chassis.version: 1.0 dmi.modalias: dmi:bvnAmericanMegatrendsInternational,LLC.:bvr1.71:bd03/26/2026:br5.19:svnMicro-StarInternationalCo.,Ltd.:pnMS-7D82:pvr1.0:rvnMicro-StarInternationalCo.,Ltd.:rnPROH410M-B(MS-7D82):rvr1.0:cvnMicro-StarInternationalCo.,Ltd.:ct3:cvr1.0:skuDefaultstring:pfaDefaultstring: dmi.product.family: Default string dmi.product.name: MS-7D82 dmi.product.sku: Default string dmi.product.version: 1.0 dmi.sys.vendor: Micro-Star International Co., Ltd. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2169236/+subscriptions