In my case I rarely have the monitor connected to the macmini, so I can't
say if this always happens or behaviour changed since I installed OpenBSD
on it.

In recent experiments, non-X related, I did have the monitor connected more
often and never had the video come back once it blanked.

I will do some more focused tests and try sthen's xset tweak.

.... Ken

On Fri, Mar 8, 2024, 5:18 PM Stuart Henderson <s...@spacehopper.org> wrote:

> On 2024/03/08 22:35, Mark Kettenis wrote:
> > > Date: Fri, 8 Mar 2024 20:29:35 +0000
> > > From: Stuart Henderson <s...@spacehopper.org>
> > >
> > > On 2024/03/08 14:34, Kenneth Westerback wrote:
> > > > I see the same/similar behaviour on my M1 MacMini. i.e. when sceen
> blanks
> > > > it won't come back until I reboot.
> > > >
> > > > Monitor is connected via HDMI. Happy to provide more
> details/info/tests if
> > > > same deemed useful.
> > >
> > > Just tried xset s off, which I think _may_ be helping.
> >
> > I haven't done a ton of testing myself.  Mostly just having machines
> > sit idle in xenodm.  There were some reports that quickly changing the
> > display brightness causes similar firmware hangs.  So I wonder if
> > doing something more complicated in X would trigger the issue.
> >
> > I think tobhe@ has spent a bit more time on his m2 macbook air.  But
> > maybe he doesn't have the automatic screen blanking enabled.
>
> I added 'xset s off' on top of the existing 'xset -dpms' 2 hours ago
> and the display is still on, so I think that's a winner.
>
> It didn't _always_ stay off after blanking, but did most of the time.
>

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