Public bug reported: I installed ddcutil and I was successfully able to detect my HDMI monitor and change its brightness. It also detects my laptops builtin display but does not detect my secondary dell monitor.
The dev of ddcutil said > ...the problem is either in the docking station hardware, or the i915 driver. see ddcutil-interrogate(1).log for the verbose ddcutil information This is the ddcutil github issue https://github.com/rockowitz/ddcutil/issues/491 Here is some context of my setup. Both my primary and secondary monitors are connected directly to my dell WD22TB4 dock and the dock is connected directly to my dell xps 13. os: Ubuntu 24.04.1 LTS (Noble Numbat) kernel: 6.8.0-52-generic dock: Dell Thunderbolt Dock - WD22TB4 (connected to thunderbolt port on laptop) laptop: Dell XPS 13 9310 monitor primary: cord_type=HDMI con=DP-7 model=DELL S2725DS monitor secondary: cord_type=DP con=DP-5 model=DELL S2725DS (not detected by ddcutil) ddcutil version: 2.1.4 (installed using apt) ProblemType: Bug DistroRelease: Ubuntu 24.04 Package: i2c-tools 4.3-4build2 ProcVersionSignature: Ubuntu 6.8.0-52.53-generic 6.8.12 Uname: Linux 6.8.0-52-generic x86_64 ApportVersion: 2.28.1-0ubuntu3.3 Architecture: amd64 CasperMD5CheckResult: unknown CurrentDesktop: ubuntu:GNOME Date: Tue Feb 11 14:21:42 2025 DistributionChannelDescriptor: # This is the distribution channel descriptor for the OEM CDs # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor canonical-oem-somerville-focal-amd64-20200502-85 InstallationDate: Installed on 2021-06-11 (1342 days ago) InstallationMedia: Ubuntu 20.04 "Focal" - Build amd64 LIVE Binary 20200502-05:58 ProcEnviron: LANG=en_US.UTF-8 PATH=(custom, no user) SHELL=/bin/bash TERM=xterm-ghostty XDG_RUNTIME_DIR=<set> SourcePackage: i2c-tools UpgradeStatus: Upgraded to noble on 2024-12-17 (56 days ago) ** Affects: i2c-tools (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug noble wayland-session ** Attachment added: "ddcutil-interrogate(1).log" https://bugs.launchpad.net/bugs/2098032/+attachment/5856599/+files/ddcutil-interrogate%281%29.log -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2098032 Title: i2cdetect has trouble communicating with external monitor plugged into dell dock To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/i2c-tools/+bug/2098032/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
