It looks like microcode update revision 0xd6 is still the officially
shipped version.
The often occurring hangs without the power cable plugged in, are still
happening.
Booting with `maxcpus=1` and adding
earlyprintk=efi earlycon=efifb debug
to the Linux command, the last messages are:
[…]
random: crng done (trusting CPU's manufacturer)
Console: colour dummy device 80x25
printk: console [tty0] enabled
printk: bootconsole [efifb0] disabled
So, it might indeed be related to bug 1862751.
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https://bugs.launchpad.net/bugs/1883065
Title:
Dell Latitude/Precision, sig=0x806ec/20090609: Linux hangs without
plugged in power cable
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