Date: Tue, 24 Feb 1998 10:58:56 +0100 (CET) From: Andrzej Bialecki <abial@nask.pl> To: Terry Lambert <tlambert@primenet.com> Cc: freebsd-current@FreeBSD.ORG Subject: Re: Proposed addition to panic() behaviour Message-ID: <Pine.NEB.3.95.980224105141.18610C-100000@korin.warman.org.pl> In-Reply-To: <199802240937.CAA04990@usr05.primenet.com>
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On Tue, 24 Feb 1998, Terry Lambert wrote:
> > Many people (including me) suffered from panic while their console was in
> > graphic mode (e.g. X Window). I don't know if this would be proper place
> > to do this, but in case of panic (where everything is lost anyway) just
> > add there the code to forcefully reset the video card to set it in
> > known (and useful) mode...
>
> See the numerous "DDX in the kernel" discussions in the -current list
> archives to see why "just add there the code to forcefully reset the
> video card" requires knowing how the video card got in the mode it's
> in, and specific knowledge of the card (hint: write-only hardware
> registers not shadoewed in RAM).
I see. But syscons driver _knows_ how to switch from X to text mode,
doesn't it? Even if it *sometimes* fails (because some obscure registers
are garbled), *most of the time* it produces useful result. This would be
enough...
Hmm... Or is it the X server who knows how to do it, not the syscons?
But I also vaguely recall something like dump of VGA registers
when booted with -v, so they are stored somewhere, right?
Andrzej Bialecki
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abial@warman.org.pl | if(halt_per_mth > 0) { fetch("http://www.freebsd.org") }
Research & Academic | "Be open-minded, but don't let your brains to fall out."
Network in Poland | All of the above (and more) is just my personal opinion.
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