upgrade to hwe-16.04 kernel has broken hibernate/resume

[Martin Stechert]

Upgrading to hwe-16.04 (i.e. from 4.4.0-116-generic to 4.13.0-37-generic, amd64) has broken suspend to disk on my machine.
Suspend works fine, hibernation file is written to disk and system is powered off.
During resume kernel is started and and the hibernation file is loaded.
Immediately after 100% screen is blanked, fans are still running but no SSH possible, NumLock on keyboard is not working. So machine seems dead.
That happens for every suspend.
I could not read any error message before screen is blanked.
No messages from suspend found in syslog or kernel.log.
I tried to make it more verbose with "initcall_debug no_console_suspend ignore_loglevel", but I have not managed to make messages persistent till next boot.

[Martin Stechert (martin-stechert)]

Vanilla kernels (4.15.14 and 4.13.16, build with make-kpkg) suspend&resume without problems.

[Martin Stechert (martin-stechert)]

same problem with 4.13.0-38.

[Martin Stechert (martin-stechert)]

I switched to a vanilla 4.16 kernel (currently 4.16.6), so no issue for me any more.
Nevertheless is there info that I should contribute?