[Bug 2080598] Re: linux-image-6.8.0-44-generic breaks HDMI output (-41 works)

@Vinicius Peixoto (vpeixoto) Any updates on this? The bug still
reproduces with 6.8.0-48 and does as I wrote above appear to NOT be a
duplicate of that bug you mentioned.

** This bug is no longer a duplicate of bug 2062951
Random flickering with Intel i915 (Gen9 GPUs in 6th-8th gen CPUs) on Linux 6.8

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Title:
linux-image-6.8.0-44-generic breaks HDMI output (-41 works)

Status in linux package in Ubuntu:
New

Bug description:
linux-image-6.8.0-44-generic breaks HDMI output. When I connect to the
HDMI port on this laptop the external screen flickers briefly then I
get "no signal". With linux-image-6.8.0-41-generic the HDMI out works
as normal. DisplayPort over USB C seems to work, but only one of my
two external monitors support that.

There is no obvious error message in dmesg when this happens.

I tried with both KDE and Gnome X11 and Wayland sessions (all 4
combinations). None of that makes a difference.

I'm running in PRIME on-demand mode, and on this laptop the external
display outputs are connected to the Intel graphics (not the nvidia
graphics). That *is* configurable in UEFI settings, but I haven't
tried changing that.

ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: linux-image-6.8.0-44-generic 6.8.0-44.44
ProcVersionSignature: Ubuntu 6.8.0-44.44-generic 6.8.12
Uname: Linux 6.8.0-44-generic x86_64
ApportVersion: 2.28.1-0ubuntu3.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/seq: tmgarn 4545 F.... pipewire
/dev/snd/controlC0: tmgarn 4547 F.... wireplumber
/dev/snd/controlC1: tmgarn 4547 F.... wireplumber
CasperMD5CheckResult: pass
CurrentDesktop: KDE
Date: Fri Sep 13 08:42:02 2024
InstallationDate: Installed on 2023-05-30 (472 days ago)
InstallationMedia: Ubuntu 22.04.2 LTS "Jammy Jellyfish" - Release amd64 (20230223)
MachineType: Dell Inc. Precision 7670
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-6.8.0-44-generic root=UUID=aee0f2dc-6cba-4c78-a07d-0844d6efb552 ro crashkernel=600M
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
RelatedPackageVersions:
linux-restricted-modules-6.8.0-44-generic N/A
linux-backports-modules-6.8.0-44-generic N/A
linux-firmware 20240318.git3b128b60-0ubuntu2.3
SourcePackage: linux
UpgradeStatus: Upgraded to noble on 2024-09-02 (11 days ago)
dmi.bios.date: 09/15/2023
dmi.bios.release: 1.16
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.16.0
dmi.board.name: 091YVN
dmi.board.vendor: Dell Inc.
dmi.board.version: A02
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.16.0:bd09/15/2023:br1.16:svnDellInc.:pnPrecision7670:pvr:rvnDellInc.:rn091YVN:rvrA02:cvnDellInc.:ct10:cvr:sku0B2A:
dmi.product.family: Precision
dmi.product.name: Precision 7670
dmi.product.sku: 0B2A
dmi.sys.vendor: Dell Inc.
modified.conffile..etc.default.apport: [modified]
mtime.conffile..etc.default.apport: 2024-09-03T18:02:55.663299

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