Regression Resume Lenovo T450

[Manuel Stühn]

On Fri, May 04, 2018 at 08:07:17AM +0200, Manuel Stühn wrote:
>
>Since some time now CURRENT runs very smoothly on my Lenovo T450 in
>conjunction with drm-stable-kmod installed. WLAN, Suspense&Resume worked
>out of the box (at least ... until now). Due to pkg(8) complaining about
>wrong ABI of packages, I've made an update from r332385 (1200061) to
>r333091 (1200062), and now the T450 does not resume anymore; i have to
>hold the power button for some time to power it down. The
>ZFS-Boot-Environment I've made beforehand updating is still capable of
>resuming.
>
>I tried to find out which commit broke the resume for me by installing
>older kernels, but even installing r332385 kernel (into the actual
>r333091 userland) does not restore its capability to resume.
>

Some more testing has happened:

Since I have a BootEnvironment capable of suspend/resume, I've tried 
some combinations of kernels (in fact, whole boot-folders) and 
unserlands. I copied the boot-folder from the BE r332385 (which works) 
into the current BE and restarted. This combination was NOT able to 
resume. But the other way around is (current boot-folder (r333091) in 
the r332385 based BootEnvironment)

It seems to me, that not the kernel but either some change in userland 
or package broke the resume somehow. But I do not have a clue, which of 
those even can impact the resume procedure at all. Two packages came to 
my mind:

1. graphics/drm-stable-kmod, but the installed packages are identical 
for both, the "old" and the current BE. (both packages are installed 
from ports along with the respective buildworld+buildkernel)

2. The firmwares used by sysutils/cpupdate, but after replacing the 
firmware files with the firmwares from the old BE resume still doesn't 
work.

Any ideas?

--
Manuel