[Asus UX580] External HDMI display not working with Intel GPU, only works with Nvidia

[Pavel Deg]

I have Asus UX580 laptop with intel and nvidia 1050 video cards under Ubuntu 19.10.
For some reason dual monitor setup with external monitor via HDMI only works if I switch to Nvidia only. If I select Intel GPU or "on-demand" in Nvidia server settings HDMI out is not working at all - xrandr shows HDMI out disconnected.

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ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu8.2
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
DisplayManager: gdm3
DistroRelease: Ubuntu 19.10
InstallationDate: Installed on 2019-10-29 (38 days ago)
InstallationMedia: Ubuntu 19.10 "Eoan Ermine" - Release amd64 (20191017)
NonfreeKernelModules: nvidia_modeset nvidia
Package: gnome-shell 3.34.1+git20191024-1ubuntu1~19.10.1
PackageArchitecture: amd64
ProcEnviron:
 TERM=xterm-256color
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 5.3.0-23.25-generic 5.3.7
RelatedPackageVersions: mutter-common 3.34.1+git20191107-1ubuntu1~19.10.1
Tags: eoan
Uname: Linux 5.3.0-23-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo
_MarkForUpload: True

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/1854877/+editstatus and add the package name in the text box next to the word Package.

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]

[Daniel van Vugt (vanvugt)]

This might be related to the fact that some HDMI ports are only connected to the Nvidia GPU and others only connected to Intel. That's normal, but might not be the only factor here.

To help us diagnose it further please run this command to collect more system info:

  apport-collect 1854877

[Pavel Deg (paveldeg)]

apport information

[Pavel Deg (paveldeg)]

apport information

[Pavel Deg (paveldeg)]

apport information

[Pavel Deg (paveldeg)]

apport information

[Pavel Deg (paveldeg)]

apport information

[Pavel Deg (paveldeg)]

apport-collect sent.

Just FYI, under Windows on same laptop I can switch to Intel only, and still use my HDMI monitor.

[Daniel van Vugt (vanvugt)]

I'm not sure Windows is telling you the full truth there. Even if you tell it to prefer the Intel GPU it can't get around the fact that on most hybrid laptops if there's only one HDMI port then it will be physically wired to the secondary GPU, not Intel. Even if the Intel GPU was doing the work Nvidia would usually be handling the port itself.

[Daniel van Vugt (vanvugt)]

Can you please attach $HOME/.local/share/xorg/Xorg.0.log ?

[Pavel Deg (paveldeg)]

attached xorg.log.

Thanks for the explanation.
However I do think that since both Windows 10 and Ubuntu use same Nvidia driver, and Windows can handle HDMI with Intel GPU only, then Ubuntu should be able to do the same.