Public bug reported:
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).
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Attachment added: "bug-report.txt"
https://bugs.launchpad.net/bugs/2169236/+attachment/6004644/+files/bug-report.txt
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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
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