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
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