Can you test some other desktop environment like GNOME? And try Wayland?

At the moment all I can see is that Xorg thinks both monitors are
working. So the bug may be Xorg, the amdgpu Xorg driver,  XFCE, or the

** Package changed: xorg (Ubuntu) => xserver-xorg-video-amdgpu (Ubuntu)

** Changed in: xserver-xorg-video-amdgpu (Ubuntu)
       Status: New => Incomplete

** Tags added: amdgpu

** Also affects: linux-hwe-6.5 (Ubuntu)
   Importance: Undecided
       Status: New

** Summary changed:

- System starts, but monitor on HDMI has no signal
+ System starts, but monitor on HDMI has no signal in 6.5 (but 6.2 works)

** Changed in: linux-hwe-6.5 (Ubuntu)
       Status: New => Incomplete

You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to xorg in Ubuntu.

  System starts, but monitor on HDMI has no signal in 6.5 (but 6.2

Status in linux-hwe-6.5 package in Ubuntu:
Status in xserver-xorg-video-amdgpu package in Ubuntu:

Bug description:
  I have been running with kernel 6.2 without any problems.

  However, when the system upgraded to kernel 6.5, the system boots, but the 
monitor connected via HDMI has no signal. 
  The system seems to think everything is OK, there are no errors in the Xorg 
log, xrandr shows both displays, so does inxi -Fxxxrz.

  Both monitors are connected via the AMD Radeon RX 6600 graphics card, the LG 
using DisplayPort, the Benq using HDMI. 
  The Benq monitor will show "No Signal Detected" when the system boots and I 
log into the desktop. The LG monitor shows the correct display. The Display app 
will show both monitors as present, it's just that nothing is actually sent via 
the cable to the monitor. So the monitor doesn't get any signal.

  If I connect the Benq via DisplayPort and the LG via HDMI, then the LG
  shows "No Signal Detected".

  Comparing the Xorg.0.log files from using kernel 6.2 and 6.5, I don't
  see any errors or indications why the HDMI output isn't sending data.

  I've attached a tar.gz file with the 6.2 and 6.5 kernel results for
  the Xorg.0.log, the output of "inxi -Fxxxrz" and "xrandr -q".

  My current work around is to boot into kernel 6.2, but I would like to
  see the new kernel functioning properly.

  ProblemType: Bug
  DistroRelease: Ubuntu 22.04
  Package: xorg 1:7.7+23ubuntu2
  ProcVersionSignature: Ubuntu 6.5.0-18.18~22.04.1-generic 6.5.8
  Uname: Linux 6.5.0-18-generic x86_64
  NonfreeKernelModules: zfs
  ApportVersion: 2.20.11-0ubuntu82.5
  Architecture: amd64
  CasperMD5CheckResult: unknown
  CompizPlugins: No value set for 
  CompositorRunning: None
  CurrentDesktop: XFCE
  Date: Sat Feb 17 17:09:53 2024
  DistUpgraded: Fresh install
  DistroCodename: jammy
  DistroVariant: ubuntu
   virtualbox/6.1.50, 6.2.0-39-generic, x86_64: installed
   virtualbox/6.1.50, 6.5.0-18-generic, x86_64: installed
  ExtraDebuggingInterest: Yes
   Advanced Micro Devices, Inc. [AMD/ATI] Navi 23 [Radeon RX 6600/6600 
XT/6600M] [1002:73ff] (rev c7) (prog-if 00 [VGA controller])
     Subsystem: XFX Limited Navi 23 [Radeon RX 6600/6600 XT/6600M] [1eae:6505]
   Advanced Micro Devices, Inc. [AMD/ATI] Cezanne [1002:1638] (rev c8) (prog-if 
00 [VGA controller])
     Subsystem: ASUSTeK Computer Inc. Cezanne [1043:8809]
  InstallationDate: Installed on 2015-08-11 (3112 days ago)
  InstallationMedia: Xubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 
  MachineType: ASUS System Product Name
   PATH=(custom, no user)
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.5.0-18-generic 
root=UUID=e6fe56b0-c6a6-48fd-9203-44e7395670df ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  UpgradeStatus: No upgrade log present (probably fresh install)
  XorgLogOld: 02/25/2022
  dmi.bios.release: 5.17
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 2604
  dmi.board.asset.tag: Default string PRIME B550-PLUS
  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:bvnAmericanMegatrendsInc.:bvr2604:bd02/25/2022:br5.17:svnASUS:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnPRIMEB550-PLUS:rvrRevX.0x:cvnDefaultstring:ct3:cvrDefaultstring:skuSKU: To be filled by O.E.M. System Product Name
  dmi.product.sku: SKU
  dmi.product.version: System Version
  dmi.sys.vendor: ASUS
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.113-2~ubuntu0.22.04.1
  version.libgl1-mesa-dri: libgl1-mesa-dri 23.2.1-1ubuntu3.1~22.04.2
  version.libgl1-mesa-glx: libgl1-mesa-glx 23.0.4-0ubuntu1~22.04.1
  version.xserver-xorg-core: xserver-xorg-core 2:21.1.4-2ubuntu1.7~22.04.8
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.6-2build1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-2ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 

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