Hi LEE KUAN-YING, The ticket can be closed. Unfortunately, it turns out that my thunderbolt controller is definitely dead :-(
Best regards, Luc Chauvin *Luc Chauvin **Consultant IT / DEVOPS* [email protected]http://www.digital2real.net+33 (0) 677 153 321PRENDRE UN RDV <https://calendar.app.google/TicY6Gd9EjCd32sJ6> Le lun. 8 déc. 2025 à 03:40, LEE KUAN-YING <[email protected]> a écrit : > The next step is to fully commit bisect from the most recent kernel > version that worked, followed immediately by the next kernel version > that did not work. This will allow for a direct review of the offending > commit for either reverting, or further improvements. Could you please > do this following https://wiki.ubuntu.com/Kernel/KernelBisection ? This > article was written for folks who don't know anything about linux, so > it's easy to follow. > > Please note, finding adjacent kernel versions, or providing a commit > without testing it and reverting it is not fully commit bisecting. > > Also, the kernel release names are irrelevant for the purposes of > bisecting. > > It is most helpful that after the bad commit (not kernel version) has > been confirmed via testing, you then mark this report Status Confirmed. > > Thank you for your help. > > -- > You received this bug notification because you are subscribed to the bug > report. > https://bugs.launchpad.net/bugs/2134339 > > Title: > Kernel 5.15.0-163: Display detection broken on NVIDIA Quadro T2000 > with two external monitors > > Status in linux package in Ubuntu: > New > > Bug description: > Description: > After upgrading from Linux kernel 5.15.0-161 to 5.15.0-163, two external > monitors connected to an NVIDIA Quadro T2000 GPU are no longer detected by > the system. > System Information: > > Kernel: 5.15.0-163-generic > GPU: NVIDIA Quadro T2000 (TU117GL-A) > Driver: nvidia 580.95.05 > Display Manager: GDM (GNOME Display Manager) > > Observed Behavior: > With kernel 5.15.0-163, the journalctl logs show that display ports > DFP-0 and DFP-2 are marked as disconnected, while the two monitors were > previously working correctly on kernel 5.15.0-161. > Current detection status in 5.15.0-163: > > DFP-0: disconnected (Internal DisplayPort) > DFP-1: disconnected (Internal DisplayPort) > DFP-2: disconnected (Internal TMDS) > DFP-3: connected (RTK J560J10 - TMDS) ✓ > DFP-4: connected (BOE Technology Group - DisplayPort) ✓ > DFP-5: disconnected (Internal DisplayPort) > > Regression: > Kernel 5.15.0-161 detects all displays correctly. The issue appears to > be a kernel regression between these two versions. > Workaround: > Reverting to kernel 5.15.0-161-generic resolves the issue completely. > > ProblemType: Bug > DistroRelease: Ubuntu 22.04 > Package: linux-image-5.15.0-163-generic 5.15.0-163.173 > ProcVersionSignature: Ubuntu 5.15.0-163.173-generic 5.15.193 > Uname: Linux 5.15.0-163-generic x86_64 > NonfreeKernelModules: nvidia_modeset nvidia > ApportVersion: 2.20.11-0ubuntu82.10 > Architecture: amd64 > CasperMD5CheckResult: unknown > CurrentDesktop: ubuntu:GNOME > Date: Sun Dec 7 16:42:45 2025 > InstallationDate: Installed on 2020-03-10 (2098 days ago) > InstallationMedia: Ubuntu-Server 18.04.4 LTS "Bionic Beaver" - Release > amd64 (20200203.1) > MachineType: LENOVO 20QNCTO1WW > ProcFB: 0 EFI VGA > ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.15.0-163-generic > root=/dev/mapper/vg0-lv--0 ro > RelatedPackageVersions: > linux-restricted-modules-5.15.0-163-generic N/A > linux-backports-modules-5.15.0-163-generic N/A > linux-firmware > 20220329.git681281e4-0ubuntu3.40 > SourcePackage: linux > UpgradeStatus: No upgrade log present (probably fresh install) > dmi.bios.date: 10/27/2020 > dmi.bios.release: 1.26 > dmi.bios.vendor: LENOVO > dmi.bios.version: N2NET41W (1.26 ) > dmi.board.asset.tag: Not Available > dmi.board.name: 20QNCTO1WW > dmi.board.vendor: LENOVO > dmi.board.version: SDK0J40697 WIN > dmi.chassis.asset.tag: No Asset Information > dmi.chassis.type: 10 > dmi.chassis.vendor: LENOVO > dmi.chassis.version: None > dmi.ec.firmware.release: 1.9 > dmi.modalias: > dmi:bvnLENOVO:bvrN2NET41W(1.26):bd10/27/2020:br1.26:efr1.9:svnLENOVO:pn20QNCTO1WW:pvrThinkPadP53:rvnLENOVO:rn20QNCTO1WW:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_20QN_BU_Think_FM_ThinkPadP53: > dmi.product.family: ThinkPad P53 > dmi.product.name: 20QNCTO1WW > dmi.product.sku: LENOVO_MT_20QN_BU_Think_FM_ThinkPad P53 > dmi.product.version: ThinkPad P53 > dmi.sys.vendor: LENOVO > > To manage notifications about this bug go to: > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2134339/+subscriptions > > -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2134339 Title: Kernel 5.15.0-163: Display detection broken on NVIDIA Quadro T2000 with two external monitors To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2134339/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
