From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <381b243cd5e8491af8fad252219d464b@plan9.bell-labs.com>
From: jmk@plan9.bell-labs.com
To: 9fans@cse.psu.edu
Subject: Re: [9fans] suspending screens (was: rotzoomer)
In-Reply-To: <20030121120259.Q9171@fbsd.cpsc.ucalgary.ca>
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Date: Tue, 21 Jan 2003 14:18:14 -0500
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although i have't tried it on the t21, the t23 has a similar problem when used
in anything other that 8-bit mode. the bios apm code fails to set the depth bits
correctly in crt register 0x90, e.g. for 16-bit mode it should be 0x81, not 0x80
(see /sys/src/cmd/vga/virge.c). i have a dumb little programme ('adjust') for poking
registers directly when testing things and use this to reset the screen after
the lid has been opened:

	/usr/jmk/src/v/adjust crt 0x90 0x81

if i could be bothered i'd figure ou how to get that run automatically on
opening the lid. fyi, here's how to display on an external monitor on the t23:

	# turn on hsync/vsync to external monitor
	% adjust seq 0x0d 0
	0x3C4[0x0D]: 0x50->0x00

	# power up the DACs
	% adjust seq 0x18 0
	0x3C4[0x18]: 0x20->0x00

	# turn off the lcd
	% adjust seq 0x31 0
	0x3C4[0x31]: 0x10->0x00
	%