Comment 2 for bug 1987036

Package: libkf5idletime5 5.92.0-0ubuntu1

I'm seeing the same segfault and symptoms without using any backports, after upgrading from Lubuntu 21.10 to 22.04.1 LTS. A third user has also reported the crash after a similar upgrade on an upstream bug: https://github.com/lxqt/lxqt/discussions/2219#discussioncomment-3285033 That bug includes developer comments for Arch, which would imply a bug in libkf5idletime5 5.92.0-0ubuntu1.

Steps to reproduce:
0) upgrade Lubunutu from 21.10 to 22.04.1
1) in Power Management Settings, go to Idle, tick 'Enable Backlight Change'. Set idle time to 00:30 (30 seconds), and close.
2) wait 10 seconds

Expected behaviour:
Backlight dims until keystroke or pointer movement, then returns to previous value, and lxqt-powermanagment continues to function.

Experienced behaviour:
Backlight dims, segmentation fault and icon disappears from Status Notifier. Backlight remains dimmed on keystroke and requires manual brightening. Eventually popup that 'Power Management has crashed too many times.'

Sep 6 16:35:38 laptop kernel: [ 4614.857616] lxqt-powermanag[5907]: segfault at 126c ip 00007f958f3d1059 sp 00007ffd4d569b68 error 4 in libQt5Core.so.5.15.3[7f958f357000+30f000]
Sep 6 16:35:38 laptop kernel: [ 4614.857649] Code: 31 d2 f7 f1 49 8b 40 08 83 c2 01 48 63 f2 48 8d 04 f0 29 d1 74 d8 89 c9 48 8d 0c c8 eb 0c 0f 1f 00 48 83 c0 08 48 39 c8 74 c4 <48> 8b 10 49 39 d0 74 ef 49 89 d0 4c 89 c0 c3 0f 1f 84 00 00 00 00

Notes: bug 1987667 by the original reporter looks closely related in kidletime.