Thanks Jacob. I tested the latest mainline stable build, v7.1.3
(7.1.3-070103-generic), on the same hardware.
Note: the mainline image initially panicked at boot with "VFS: Unable to mount
root fs on unknown-block(0,0)" because no initramfs was generated on install. I
generated one with:
sudo update-initramfs -c -k 7.1.3-070103-generic
sudo update-grub
after which 7.1.3 boots normally.
Result: I could NOT reproduce the boot stall on 7.1.3. I tried 15+
different cases and times, including the specific conditions that
reliably reproduce it on 7.0.0-27 (rebooting from a second user session,
and repeated reboots to try to trigger the latched state). On 7.1.3 the
initramfs phase was consistently fast every time and the usb 1-8
enumeration retry cycle did not occur.
For reference, on the same machine:
7.0.0-27-generic: initrd ~65s when the stall is present
7.1.3-070103-generic: initrd 2.119s, stall never observed (total boot
18.4s)
So whatever the cause, it appears to be resolved somewhere between 7.0.0
and 7.1.3 upstream. The broken/phantom USB port and the (likely faulty)
controller are physically unchanged, only the kernel differs.
Happy to test a specific intermediate build or provide any further logs
if that would help narrow down which change fixed it.
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https://bugs.launchpad.net/bugs/2158569
Title:
7.0.0 kernel spends ~63s in initramfs retrying a non-enumerable USB
port while 6.19.10 doesn't (same hardware)
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