WARNING: This image is OVERSIZED. This should never happen during milestone testing.
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Test-case Live Session Start
Test-case Live Session Usage
If all actions produce the expected results listed, please submit a 'passed' result. If an action fails, or produces an unexpected result, please submit a 'failed' result and file a bug. Please be sure to include the bug number when you submit your result.
As ItzSwirlz suggested, filing my testing on a desktop install as a 'live session' test. Ran through the manual tests ( https://github.com/ubuntu-mate/qa/tree/master/manual-tests ) for About Me, About MATE, and (most of) Atril on Ubuntu MATE 21.04 on my PackardBell iMedia S1710. Gave up after the lock screen / desktop failed to come up after leaving the computer for a while, and then rebooting threw me into longstanding bug 1522976 which I haven't kernel bisected yet. Whilst I was testing filed 1921582 which I'm not sure is reproducible but hopefully the logs are helpful, and 1921588 which is a known issue (probably Won't Fix) but which I couldn't find a bug filed for, so filed it.