External display is detected and X believes it is OK as the desktop correctly extends to the 2nd monitor but said monitor remains blank. It used to work a couple of days ago but I guess some upgrade is the cause. I tried to downgrade amd64-microcode and linux-firmware, to no avail : dmesg still shows issues with drivers.
ProblemType: Bug
DistroRelease: Ubuntu 23.10
Package: xorg 1:7.7+23ubuntu2
ProcVersionSignature: Ubuntu 6.5.0-14.14-generic 6.5.3
Uname: Linux 6.5.0-14-generic x86_64
ApportVersion: 2.27.0-0ubuntu5
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckResult: pass
CompositorRunning: None
CurrentDesktop: XFCE
Date: Mon Dec 18 12:14:54 2023
DistUpgraded: 2023-12-18 10:58:52,052 DEBUG Running PostInstallScript: '/usr/lib/ubuntu-advantage/upgrade_lts_contract.py'
DistroCodename: mantic
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
Advanced Micro Devices, Inc. [AMD/ATI] Barcelo [1002:15e7] (rev c5) (prog-if 00 [VGA controller])
Subsystem: Hewlett-Packard Company Barcelo [103c:8b5c]
InstallationDate: Installed on 2023-08-08 (132 days ago)
InstallationMedia: Ubuntu 23.04 "Lunar Lobster" - Release amd64 (20230418)
MachineType: {report['dmi.sys.vendor']} {report['dmi.product.name']}
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.5.0-14-generic root=UUID=d29d3432-7c6f-4376-a050-c86365d7b922 ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to mantic on 2023-12-18 (0 days ago)
dmi.bios.date: 04/25/2023
dmi.bios.release: 2.1
dmi.bios.vendor: HP
dmi.bios.version: V78 Ver. 01.02.01
dmi.board.name: 8B5C
dmi.board.vendor: HP
dmi.board.version: KBC Version 53.1D.00
dmi.chassis.type: 10
dmi.chassis.vendor: HP
dmi.ec.firmware.release: 83.29
dmi.modalias: dmi:bvnHP:bvrV78Ver.01.02.01:bd04/25/2023:br2.1:efr83.29:svnHP:pnHPProBook44514inchG10NotebookPC:pvr:rvnHP:rn8B5C:rvrKBCVersion53.1D.00:cvnHP:ct10:cvr:sku852U8ES#UUZ:
dmi.product.family: 103C_5336AN HP ProBook
dmi.product.name: HP ProBook 445 14 inch G10 Notebook PC
dmi.product.sku: 852U8ES#UUZ
dmi.sys.vendor: HP
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.115-1
version.libgl1-mesa-dri: libgl1-mesa-dri 23.2.1-1ubuntu3.1
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:21.1.7-3ubuntu2.4
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-3
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20210115-1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.17-2build1
Indeed the kernel seems to be crashing in drm graphics code so I'd recommend trying some newer kernels such as https:/