I've just experienced this problem (or very similar) on a fresh install
of Xubuntu 20.04, on a Thinkpad x240.
On wake, I could move the mouse, and switch to a virtual console with
ctrl-alt-f1. The session would sometimes animate for a moment (e.g. a
notification about change in wifi), before freezing completely (except
for mouse).
I did not try killing/restarting any sessions.
This happened both when selecting sleep then pressing the power button
to wake, and when sleeping by closing the laptop lid and opening to
wake. The laptop was plugged into AC power the entire time.
The problem persisted across reboots, but stopped occurring (seemingly)
when I rebooted, then unplugged the laptop from AC power. I can now wake
successfully with the laptop both plugged and unplugged. Haven't tried
rebooting again since. I have no proprietary drivers installed.
`sudo lshw -C display`:
*-display
description: VGA compatible controller
product: Haswell-ULT Integrated Graphics Controller
vendor: Intel Corporation
physical id: 2
bus info: pci@0000:00:02.0
version: 0b
width: 64 bits
clock: 33MHz
capabilities: msi pm vga_controller bus_master cap_list rom
configuration: driver=i915 latency=0
resources: irq:50 memory:e0000000-e03fffff memory:c0000000-dfffffff
ioport:3000(size=64) memory:c0000-dffff
Attached config files, which might contain relevant power manager
settings.
** Attachment added: "The contents of ~/.config/xfce4/xfconf"
https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1605813/+attachment/5360220/+files/xfconf.tar.gz
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https://bugs.launchpad.net/bugs/1605813
Title:
lock screen freezes while trying to wake from suspend
Status in lightdm package in Ubuntu:
Confirmed
Bug description:
Background:
I am running a fully updated 16.04.1 installation of Ubuntu using open
source nVidia drivers. When I press the power button on my PC to wake
the computer from suspend, the login screen appears and freezes. The
box around my username becomes somewhat opaque and no text box that
would allow me to enter my password appears. I have tried this many
times, and it always locks up in the same way.
Steps taken after issue occurs:
I have found, however, that the system is not completely locked up. I
can use CTL + ALT + F2 to switch to TTY2. From there I can login and
restart the computer without issue.
I also tried restarting lightdm via sudo service lightdm restart.
When I tried this and switched back to the GUI, the login screen was
loaded, and I could type my password. Once the login screen
disappeared, one of my monitors (dual-monitor setup) switched to my
user account's wallpaper, and then the system locked up. I had to
perform a hard restart.
Workaround:
I have found that using the proprietary 361.42 drivers provides a work
around for this issue. When using the proprietary drivers, the
computer resumes from suspend without issue.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: lightdm 1.18.2-0ubuntu1
ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
Uname: Linux 4.4.0-31-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: Unity
Date: Fri Jul 22 20:53:10 2016
EcryptfsInUse: Yes
InstallationDate: Installed on 2016-07-08 (14 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64
(20160420.1)
ProcEnviron:
LANGUAGE=en_US
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=en_US.UTF-8
SHELL=/bin/bash
SourcePackage: lightdm
UpgradeStatus: No upgrade log present (probably fresh install)
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https://bugs.launchpad.net/ubuntu/+source/lightdm/+bug/1605813/+subscriptions
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