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Date: Fri, 2 Feb 1996 16:11:59 +0100
From: Thomas Graichen <graichen@omega.physik.fu-berlin.de>
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Subject: kern/987: syscons problems with mono vga
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>Number:         987
>Category:       kern
>Synopsis:       the syscons driver has problems with mono vga monitors
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Feb  2 09:20:01 PST 1996
>Last-Modified:
>Originator:     Thomas Graichen
>Organization:
thomas graichen    graichen@mail.physik.fu-berlin.de    graichen@FreeBSD.org

  perfection is reached, not when there is no longer anything to add, but when
      there is no longer anything to take away    antoine de saint-exupery
>Release:        FreeBSD 2.1-STABLE i386
>Environment:
		kernel with syscons (sc0) compiled in and a mono vga monitor
attached, Xfree86-3.1.2S, various graphics cards (trident, s3, avance logic),
various monitors
		
	

>Description:
		if you switch back to a virtual console from x it is blank -
it is still there, reacting still to input - but you can't see anything there
- it happens for all monochrome vga monitors which are detected as <VGA Mono>
but _not_ for monochrome vga monitors which are detected as <VGA Color> - i've
tested it with 3 different monochrome monitors (3 mono - 2 of them were
detected as <VGA Mono> and show the bug ans 1 was detected as <VGA Color> and
did'nt show the bug) - i've also tried it with 3 differen graphics-cards
(trident 8900cl, miro 10sd, miro 10ad) and different x-servers (SVGA, S3,
VGA16, VGA2) - all the same - thus the bug must be somethere in the syscons.*
code for monochrome vga monitors - i think it's the same behaviour as kern/927
- if anybody has an idea - please send me a patch and i can try it directly
(by the way: pcvt works fine in that situation)
	

>How-To-Repeat:
		boot a syscons kernel, start x and switch back to a virtual
console - you will only see a black screen

	

>Fix:
		use pcvt :-( - but that's no solution i think

	

>Audit-Trail:
>Unformatted: