Ok, turns out it's not a version issue but a config issue:
CONFIG_INTEL_IOMMU_DEFAULT_ON=y is what causes the problem. The reason
that 6.6.18 from the mainline ppa is good while 6.6.19 is bad is that
the former has this disabled while the later has it enabled:
% diff -u0 /boot/config-6.6.1*-generi
Got my hands on a beefier machine where I was able to build a config of
6.6.19 that (once installed on my laptop) exhibits the same problem as
the one from the mainline ppa.
Compared to may previous attempt:
1. Kept the config unchanged.
2. Instead did apt install linux-buildinfo-6.8.0-48-generic
For what it's worth, the problem persists with the 6.8.0-48-generic
kernel.
Also, I've tried building the kernel locally in order to hopefully
commit-bisect the issue. Turns out my locally compiled 6.6.19 does not
exhibit the problem, while 6.6.19 from the mainline kernel ppa does.
I've done the
apport information
** Tags added: apport-collected
** Description changed:
After a routine upgrade which installed the 6.8 kernel, my laptop
(Lenovo Thinkpad E460) stopped resuming from suspend. I press keys, hit
the power button, but nothing works and I have to hard reboot in the
end.
** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Changed in: linux (Ubuntu)
Assignee: (unassigned) => Vinicius Peixoto (vpeixoto)
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Hi Manuel,
Thanks for taking the time to open this bug report. Can you run
apport-collect 2080693
in order to collect relevant system logs + hw info so that we can look
into this further?
Thanks,
Vinicius
** Package changed: linux-signed-hwe-6.8 (Ubuntu) => linux (Ubuntu)
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