It appears the freeze was due to a crash mentioned in your kernel:
[ 551.339814] gnome-shell[1798]: segfault at 4400 ip 00007f29b593b9e1 sp
00007ffe617a1710 error 4 in libmutter-2.so.0.0.0[7f29b58b0000+158000]
[ 551.339837] Code: 00 4c 89 e2 48 89 ee 48 89 df e8 fa 04 fc ff 85 c0 74 5e
4c 8b 74 24 18 e8 4c b0 01 00 4d 85 f6 74 df 49 8b 0e 48 85 c9 74 05 <48> 39 01
74 0f 48 89 c6 4c 89 f7 e8 4f 14 fc ff 85 c0 74 c3 41 f6
therefore...
Thank you for taking the time to report this bug and helping to make
Ubuntu better. It sounds like some part of the system has crashed. To
help us find the cause of the crash please follow these steps:
1. Look in /var/crash for crash files and if found run:
ubuntu-bug YOURFILE.crash
Then tell us the ID of the newly-created bug.
2. If step 1 failed then look at https://errors.ubuntu.com/user/ID where
ID is the content of file /var/lib/whoopsie/whoopsie-id on the machine.
Do you find any links to recent problems on that page? If so then please
send the links to us.
3. If step 2 also failed then apply the workaround from bug 994921,
reboot, reproduce the crash, and retry step 1.
Please take care to avoid attaching .crash files to bugs as we are
unable to process them as file attachments. It would also be a security
risk for yourself.
** Package changed: xorg (Ubuntu) => mutter (Ubuntu)
** Also affects: gnome-shell (Ubuntu)
Importance: Undecided
Status: New
** Tags added: nouveau
** Summary changed:
- Gnome shell/Xorg freeze after remote connection with monitor unplugged
+ [nouveau] Gnome shell/Xorg freeze after remote connection with monitor
unplugged
** Changed in: gnome-shell (Ubuntu)
Status: New => Incomplete
** Changed in: mutter (Ubuntu)
Status: New => Incomplete
--
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to mutter in Ubuntu.
https://bugs.launchpad.net/bugs/1845076
Title:
[nouveau] Gnome shell/Xorg freeze after remote connection with monitor
unplugged
Status in gnome-shell package in Ubuntu:
Incomplete
Status in mutter package in Ubuntu:
Incomplete
Bug description:
I was trying to have a remote connection on a Ubuntu 18.04 pc with nomachine
(but the behavior with Anydesk is the same) AFTER I unplugged the monitor form
that pc.
Once connected the output on the client freeze by just opening the Activities
panel. If I plug the monitor back in on the server, the gnome shell is glitched
and the only way to gain back control is by doing ALT F2 and then r.
If I keep the monitor plugged in but turned off everything will work as it
should.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: xorg 1:7.7+19ubuntu7.1
ProcVersionSignature: Ubuntu 5.0.0-29.31~18.04.1-generic 5.0.21
Uname: Linux 5.0.0-29-generic x86_64
ApportVersion: 2.20.9-0ubuntu7.7
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Tue Sep 24 00:24:03 2019
DistUpgraded: Fresh install
DistroCodename: bionic
DistroVariant: ubuntu
ExtraDebuggingInterest: I just need to know a workaround
GraphicsCard:
NVIDIA Corporation GP107 [GeForce GTX 1050 Ti] [10de:1c82] (rev a1) (prog-if
00 [VGA controller])
Subsystem: ZOTAC International (MCO) Ltd. GP107 [GeForce GTX 1050 Ti]
[19da:2454]
InstallationDate: Installed on 2019-07-16 (69 days ago)
InstallationMedia: Ubuntu 18.04.2 LTS "Bionic Beaver" - Release amd64
(20190210)
MachineType: Gigabyte Technology Co., Ltd. GA-78LMT-USB3 6.0
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.0.0-29-generic
root=UUID=dfa66545-9ac3-41fa-817b-433d8a61bd78 ro quiet splash vt.handoff=1
SourcePackage: xorg
Symptom: display
Title: Xorg freeze
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/25/2014
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: F2
dmi.board.name: GA-78LMT-USB3 6.0
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.board.version: x.x
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.modalias:
dmi:bvnAwardSoftwareInternational,Inc.:bvrF2:bd11/25/2014:svnGigabyteTechnologyCo.,Ltd.:pnGA-78LMT-USB36.0:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnGA-78LMT-USB36.0:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
dmi.product.name: GA-78LMT-USB3 6.0
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.97-1ubuntu1~18.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 19.0.8-0ubuntu0~18.04.1
version.libgl1-mesa-glx: libgl1-mesa-glx 19.0.8-0ubuntu0~18.04.1
version.xserver-xorg-core: xserver-xorg-core N/A
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
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