Public bug reported:
In a recent driver, Nvidia finally added Linux support for render
offload, where most graphics are rendered on the CPU-onboard GPU and
only certain applications are rendered on the discrete Nvidia GPU. I
know that Ubuntu 19.10 started shipping some updated Xorg packages to
support this. For the most part the mode seems to work great.
On my laptop, however, I have found that the "on demand" mode does not
detect external monitors (and the monitor says it is not receiving a
signal). Switching to "Nvidia" mode, where everything is rendered on the
discrete GPU, makes the external displays work. The laptop is a Lenovo
Thinkpad X1 Extreme (Gen 1). I have found this occurs both with nvidia-
graphics-drivers-435 and nvidia-graphics-drivers-440 in the "graphics-
drivers" ppa.
ProblemType: Bug
DistroRelease: Ubuntu 19.10
Package: nvidia-driver-435 435.21-0ubuntu2
ProcVersionSignature: Ubuntu 5.3.0-19.20-generic 5.3.1
Uname: Linux 5.3.0-19-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.11-0ubuntu8
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Mon Oct 21 13:17:38 2019
InstallationDate: Installed on 2019-09-04 (47 days ago)
InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
ProcEnviron:
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: nvidia-graphics-drivers-435
UpgradeStatus: Upgraded to eoan on 2019-10-21 (0 days ago)
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu8
Architecture: amd64
DistroRelease: Ubuntu 19.10
InstallationDate: Installed on 2019-09-04 (47 days ago)
InstallationMedia: Ubuntu 19.04 "Disco Dingo" - Release amd64 (20190416)
NonfreeKernelModules: nvidia_modeset nvidia
Package: nvidia-driver-435 435.21-0ubuntu2
PackageArchitecture: amd64
ProcEnviron:
TERM=xterm-256color
PATH=(custom, no user)
LANG=en_US.UTF-8
SHELL=/bin/bash
ProcVersionSignature: Ubuntu 5.3.0-19.20-generic 5.3.1
Tags: eoan third-party-packages
Uname: Linux 5.3.0-19-generic x86_64
UpgradeStatus: Upgraded to eoan on 2019-10-21 (0 days ago)
UserGroups:
_MarkForUpload: True
** Affects: nvidia-graphics-drivers-435 (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug apport-collected eoan third-party-packages
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https://bugs.launchpad.net/bugs/1849214
Title:
"nvidia on-demand" mode does not support external displays
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