Re: regression suspend/resume on Lenovo T420

On 0506T1103, Manuel Stühn wrote:
> On Sat, May 06, 2017 at 10:52:56AM +0200, Manuel Stühn wrote:
> >On Wed, 03 May 2017 22:28:41 +0200, Freebsdnewbie wrote
> >>
> >>> Von: Adrian Chadd
> >>> Gesendet: Mo. 01.05.2017 23:31
> >>> An: Manuel Stühn ,
> >>> Kopie: freebsd-current ,
> >>> Betreff: Re: regression suspend/resume on Lenovo T420
> >>>
> >>> There were lots of commits that could break things. :-)
> >>>
> >>>
> >>> Can you compile up some intermediary versions between 315141 and
> >>> r317559 to find which commit range broke things? That'll make chasing
> >>> it down much quicker!
> >>>
> >>
> >> I'm following your advice and building some intermediary versions. This will take some time...
> >
> >So, after keep building some more worlds i've discovered the commit
> >after which resume does not work anymore. r316736 is the last working
> >one, r316737 breaks it for me (There is also no mouse cursor on the
> >console anymore after this commit).
> 
> Sorry, my fault: r316734 was the last working revision!!

I've tried to verify that, and sadly it wasn't it for me.  The commit
that does break resume for me is r316767.  The current -CURRENT with
this one commit reverted ("svn merge -c -r316767 .") suspends and resumes
correctly, at least in VT; I decided to take X out of the picture for
now.

There is still the issue of backlight being off after resume in VT; one
needs to switch consoles to restore it, but it's 1. minor and 2. broken
for a really long time now.  There's also another problem, which kind
of looks like an inability to resume if the machine is hot (as in,
thermally), but this might be just because of its age.