Subject: Re: DDB vs Freeze
To: None <firstname.lastname@example.org>
From: Michael C. Richardson <email@example.com>
Date: 01/28/2000 11:29:44
>>>>> "Jason" == Jason Thorpe <firstname.lastname@example.org> writes:
Jason> On Thu, 27 Jan 2000 15:09:30 -0800 Hal Murray <email@example.com>
>> Would it be reasonable for the code that gets into DDB to get linked
>> up with the display driver (if there is one on the box) and do
>> something simple but conspicuous like video reversal to indicate that
>> you are in DDB rather than hung?
Jason> If we were able to do that on a PC, we'd be able to drop you back
Jason> into text mode.
Jason> The problem is that the kernel hasn't any idea how to get PC video
Jason> cards into/out of graphics mode (because there are ... so many
Jason> different ways...)
My suggestion is that the X server (or svgalib, etc) that takes the
video card out of text mode should provide a recipe for putting it back
into text mode. A list of ports/values/memory locations that need to
be written to do the trick.
I don't know how long the list would be, but I can't imagine that it
is longer than 256 items or so.
>> or play a tune on the keyboard or ... Anything to provide a strong
>> hint that will indicate that the system isn't really hung.
Jason> A tune on the keyboard certainly couldn't hurt, actually....
:!mcr!: | Cow#1: Are you worried about getting Mad Cow Disease?
Michael Richardson | Cow#2: No. I'm a duck.
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