In a more pure development environment, I can confirm this bug without
needing hybrid GPUs, or gdm3.
Just the Nvidia driver and Xorg results in no outputs/monitors detected:
$ xrandr
Screen 0: minimum 8 x 8, current 640 x 480, maximum 16384 x 16384
To work around the problem I need to run Xorg
** Tags added: nvidia-drm.modeset
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Title:
gdm3, hybrid nvidia with modeset=1, no external monitors detected
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This works. Thanks. What does gdm3 do that requires this?
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Title:
gdm3, hybrid nvidia with modeset=1, no external monitors
The solution to this is to run X11 as root, so it can use VGA arbiter
and detect displays on both the NVIDIA and modesetting drivers.
Add this to /etc/X11/Xwrapper.config :
needs_root_rights = yes
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I'm on Ubuntu 19.04 as well and having issues with this.
I have an i7-8750h paired with a gtx 1050ti in a Dell G515.
I don't exactly what I did, but I can give a general idea:
I decided this morning that battery life was important to me, so I
tinkered around with TLP. After I did that
Still present in 19.04, although as a workaround, the nvidia drivers
have reverted to installing without modeset=1, so external monitors
work, and Optimus users get dreadful tearing on their laptop's internal
screen.
With modeset=1 (which in my case was a setting preserved during the update to
After adding the line "/usr/bin/xinit" to gdm3.service I get this in
every boot:
ProblemType: Crash
Architecture: amd64
Date: Mon Mar 25 19:17:11 2019
DistroRelease: Ubuntu 18.04
ExecutablePath: /usr/lib/xorg/Xorg
ExecutableTimestamp: 1543339632
ProcCmdline: /usr/lib/xorg/Xorg :0
...
Did you
Forgot to add: Ubuntu 18.04.2
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Title:
gdm3, hybrid nvidia with modeset=1, no external monitors detected
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I confirm the bug exists and workarounds work, both with lightdm and
ExecStartPre line. Also, adding xinit to ExecStartPre messes up suspend
functionality. That is a pity...
Laptop: Thinkpad P1 with nvidia graphics
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Personally, I have not encountered that when using ubuntu or fedora and
simply swapping gdm3 for lightdm but it's good that the other bug report
has a fix. It looks like a hidpi bug; none of my monitors are hidpi.
On Thu, 21 Feb 2019 at 12:50, Stefano <1716...@bugs.launchpad.net>
wrote:
> The
The problem with the lightdm workaround is that many had this cursor
issue:
https://bugs.launchpad.net/ubuntu/+source/xfce4-settings/+bug/1770948
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Yes I was talking about the gdm3 workaround
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Title:
gdm3, hybrid nvidia with modeset=1, no external monitors detected
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There are two workarounds mentioned: swap to lightdm and manipulate gdm3
start. I think you refer to the gdm3 startup changes when you say it causes
problems with suspend/resume (which I didn't try).
The other workaround is changing display manager to lightdm (or sddm, the
KDE display manager).
Yes but this workaround is going to create others issue for suspend and
resume.
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Title:
gdm3, hybrid nvidia with modeset=1, no
Running Ubuntu 18.10 here. Wanted to do a presentation with my Notebook, but it
failed me cause of this bug.
I can confirm that it works "Out of the box" with lightdm and that it also
works with gdm3 if you modify /lib/systemd/system/gdm3.service, changing the
"ExecStartPre" line to the above
Same issue in here on Ubuntu 18.04.1 LTS. I have a Dell G3 3579 with Nvidia
Geforce 1050TI. I've tried to use a Samsung SmartTV as a secondary display
connected to HDMI port but Gnome settings only shows laptop display. I've
tested drivers 390, 396, 410, and 415 without success. This issue
sddm works too: I just put kde plasma on my ThinkPad P50 with ubuntu
18.10, it works well.
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Title:
gdm3, hybrid nvidia with
18.10 Lightdm works but GDM works only with the mentioned
hack/workaround (but with slowdowns):
ExecStartPre=/usr/bin/xinit /usr/share/gdm/generate-config
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** Tags removed: artful
** Tags added: cosmic
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Title:
gdm3, hybrid nvidia with modeset=1, no external monitors detected
To
** Also affects: mutter (Ubuntu)
Importance: Undecided
Status: New
** Changed in: mutter (Ubuntu)
Status: New => Confirmed
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The current 18.10 nvidia packages have this problem too. That is, out of
the box, the nvidia driver defaults to KMS now (first time on any
distro) but the nvidia driver does not detect external screens. Probably
should be a new bug I guess.
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** Tags added: artful bionic
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gdm3, hybrid nvidia with modeset=1, no external monitors detected
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I re-confirm this. Stock 18.04 has no graphics in pure nvidia mode (on a
Thinkpad W520 in discrete graphics).
lightdm works.
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Same on Thinkpad P51 (Nvidia Quadro M2200), Ubuntu 18.04, Nvidia 390
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gdm3, hybrid nvidia with modeset=1, no external
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: gdm3 (Ubuntu)
Status: New => Confirmed
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However with this change I'm seeing very long pauses on
restart/shutdown, i haven't found any iclue why in the logs.
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Title:
Daniel, yes that one line fixes the bug. It's not a proper fix but a
work-around for GDM3.
There's something about gdm-xsession being run that's different from
LightDM that's not triggering the nvidia modeset drivers to turn detect
external monitors and enabling PRIME sync. I discovered the
Let me clarify: the problem exists in Fedora too. Until a few hours ago, I
had never got prime sync and gdm3 working in any distribution.
This one line fix works, believe it or not. It's really a half a line fix.
I have only tried it in ubuntu 17.10 so far. Fedora is not a focus for me,
and I have
Actually the offending line is directly from Debian:
http://http.debian.net/debian/pool/main/g/gdm3/gdm3_3.26.2.1-2.debian.tar.xz
** Also affects: gdm3 (Debian)
Importance: Undecided
Status: New
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Tim, are you really saying just that one-line change fixed it?...
I can confirm at least that /usr/share/gdm/generate-config is introduced
only by Debian/Ubuntu packaging. It's not part of the upstream GDM
project. So if Fedora's approach of running under xinit works then we
should probably do
Celebratory fireworks from me.
It seems to work. For ubuntu the only difference is
[Service]
ExecStartPre=/usr/share/gdm/generate-config
becomes
[Service]
ExecStartPre=/usr/bin/xinit /usr/share/gdm/generate-config
I have a proper ubuntu gnome session running with gdm, an external
monitor
ubuntu user Hon Weng Chong has emailed me as he continues to investigate the
problem.
He believes he has proof that it is is GDM configuration issue and has provided
the following fix
Hey Tim,
I figured out a hack solution to the GDM prime issue. If you replace
** Tags added: nvidia
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