8.1-RELEASE: snd_hda works as module only, suspend/resume leaves display off

[Jung-uk Kim]

On Sunday 21 November 2010 05:37 am, Stefan Walter wrote:
> [Resent because I forgot to really cc jkim...sorry!]
>
> Ian Smith, 17.11.10, 04:20h CET:
> > On Tue, 16 Nov 2010, Bruce Cran wrote:
> >  > On Tue, 16 Nov 2010 21:46:44 +0100
> >  >
> >  > Lars Engels <lars.engels at 0x20.net> wrote:
> >  > > Download && compile the code (gcc -o chvt chvt.c).
> >  > > Add "$path/$to/chvt 1" to /etc/rc.suspend and
> >  > > "$path/$to/chvt 9" to /etc/rc.resume, so that your machine
> >  > > automatically changes to ttyv0 before going to sleep and
> >  > > changes back to X after waking up.
> >  >
> >  > The acpi code already does this: if you run acpiconf from
> >  > within X you'll see ttyv0 appear, the system turns off and
> >  > when resuming ttyv0 appears before X11.
>
> In my case, I don't see ttyv0 appear before suspend - neither from
> within X nor from another tty. But when suspending from another
> tty, I see ttyv0 briefly after resume before it switches back to
> the one I started acpiconf from, so I guess the automatic switching
> works at least between ttys.

Most cases, it happens too fast and users don't notice transition.

> When starting acpiconf from within X, I hear three beeps at
> intervals of about one second before the system suspends. As I
> wrote before, when the system resumes the screen turns on but
> remains black, the keyboard doesn't seem to do anything and I can
> only press the power button again to shut the system down
> completely. There have been cases where I've seen the console right
> before its powered down with lots of messages like this one (typed
> from memory):
>
> info: [drm] wait idle failed status

If you are using hw.acpi.reset_video=1, please load vesa.ko instead.  
hw.acpi.reset_video is an evil hack. ;-)

I don't know why X.org complains, though.

> > Perhaps this might be one of those machines (I have two) that
> > respond positively to setting sysctl
> > hw.syscons.sc_no_suspend_vtswitch=1 ?
>
> When I do that, the only difference I've noticed is that I don't
> hear the three beeps mentioned above.
>
> Can anyone tell me if there have been changes to the ACPI code in
> 8-STABLE since 8.1-RELEASE that might influence the suspend/resume
> behaviour in this case? (There has been an MFC recently, but I have
> no idea if that might change anything for me - cc'd jkim because he
> seems to know much about this stuff.)

Yes, I did several MFCs after 8.1-RELEASE, especially syscons(4), not 
ACPI.

Jung-uk Kim