NOT fixed in 5.4.0; it just recurred here on cold start from battery
power.
OS: Ubuntu 20.04 focal
Kernel: x86_64 Linux 5.4.0-37-generic
Uptime: 17m
Packages: 2908
Shell: bash 5.0.16
Resolution: 5360x1440
DE: GNOME 3.36.2
WM: BudgieWM
WM Theme: Pocillo
GTK Theme: Pocillo-dark [GTK2/3]
At the time of my first comment, and the occurrences, the kernel
installed was 5.4.0.33.38 on Ubuntu. On Jun 10 this was updated to
5.4.0.37.40 and so far I did not observe any recurrence. Note however
that the effect was intermittent. If it does not recur until end of the
month I guess it can be
Seen on ThinkPad E495. Updated BIOS to 1.16 -- good but did NOT solve
this particular issue. Still getting the boot-to-black issue on battery
power, on a random basis.
Attempting the workaround from Alexander in #3 and #5.
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