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This is a repost of something I found under a newsgroup. I didn't ask
the author to repost, so I hope it's okay. Sorry about the length.
The main drawback of dual scan, on both thinkpads and other machines, is that dual scan splits the video memory in half and stores duplicates of the image in each half (if you have the WD90C24[A,A2] chipset, which is the most commonly used -- others preva
lent are the C&T 65545 and Cirrus 6440).
This is a pain when you try to use an external monitor at resolutions higher than 800x600x256. Some machines have workaround programs (Twinhead 5100, HP 4000, Sharp PC-8700/8900, Altima Virage II) that you run under DOS, then boot linux. With other dual
scan machines, you are stuck effectively with only 512k of video ram. The fixes for Thinkpads don't work for other machines as far as we know.
Here's a HOWTO that I wrote on this subject. It's always on the web at http://www.castle.net/~darin
author: Darin Ernst (dernst@pppl.gov)
version: 0.91 5/16/95
Thanks to all those who have emailed me and posted messages on this topic!
Purpose:
To document trials and tribulations in getting X to run on the most popular video chipset used in recent notebook computers. This document gives instructions for configuring XFree86 3.1 on notebooks with the WD90C24A2 chipset. It also describes known bu
gs and workarounds if available. The content comes from communication with other users and my own experience, rather than looking at code or reading manuals.
The problems with Xfree86 3.1 XF86_SVGA and the WD90C24A2 chipset are:
1) Does XFree86 3.1.1 have a driver available?
There is really no driver available for this chipset.
2) How can I use the XF86_SVGA server then?
Most of us fake it by selecting the WD90C31 accelerated chipset
using the XF86_SVGA server. X -probeonly detects the WD90C24,
but this is not accelerated. The WD90C24A and A2 are accelerated,
and are sort of compatible with the WD90C31.
Most notebooks of 1994 use the WD90C24A2 with 1mb of video ram on the
local bus, and are capable of 1024x768x256 colors under Windows 3.1.
Some are capable of 65k colors at 640x480 using the Western Digital
windows driver wd2464_h.drv provided on an OEM disk. Other
very common chipsets not covered here are the Cirrus Logic 6440,
which is now fully supported by XFree86 3.1.1, and the
Chips and Technologies 65545, which appears in most Pentium
notebooks, especially those using the PCI bus. This chip is
partially supported with non-accelerated drivers (for the 65540).
3) Why do I only see 512k of VRAM?
A problem persists with the implementations of dual scan displays,
as well as with simultaneous display. Despite the fact that Windows 3.1
is able to use the full 1mb of video RAM to display externally
at 1024x768x256 colors, XF86_SVGA cannot, since it cannot use more
than 512k of the available 1024k. The best one can do on an external
monitor with the current XF86_SVGA server is 800x600x256.
However, workarounds exist for certain notebooks, such as the Twinhead 5
series and IBM Thinkpads.
The problem is that 512k is what X-probeonly detects, and that is all
you get. If you try to hand-enter 1024k, you will get duplicate images
on the upper and lower halves of the screen. Others (brad@npr.legent.com)
have reported that the Western Digital databook seems to confirm
that half the memory (one 256kx16bit bank) is reserved for a "frame buffer"
when a 16 bit dual-panel color STN display is used OR when simultaneous
display mode is selected.
Comparisons on active and passive versions of the AST Ascentia
(ewagner@imssys.imssys.com Evan Wagner) confirm that the 512k problem
does not rear its head on the active matrix implementation.
I observed that other things change (such as dotclocks) when
the external display is selected alone, as opposed to simultaneous
or internal display on my Twinhead 5100S (dual scan, A2 chip).
The Twinhead 5100 (aka Twinhead Slimnote 5, HP Omnibook 4000C,
Sharp PC-8700/8900, Altima Virage II) is capable of using the full
1mb of memory after one runs a DOS program called "CHGVRAM.EXE", which
is available from the Twinhead BBS. This program was written by
Ferdy Kuo of Twinhead Corp., and is copyrighted. The code is only
available from the Twinhead BBS as an executable. I would love to
give you the BBS number, but I don't want to assume responsibility
for misuse of it.
To use this program for Linux/X, boot DOS. Then hit alt-F5 until
the display is set to external-only. Then run CHGVRAM.EXE, which
will display a message something like "Video RAM changed to 1 MB".
Next, boot linux using the Linux Loader, lodlin15, which comes
in the /root directory of Slackware 2.1.0. The command is
simply "c:> linux". Linux will then boot normally. Then
use "startx" to start X-Windows. The full 1mb of video RAM
will be used by XFree86. I stick this all into a batch file
called "linux.bat".
Possible idea (haven't tried this yet): Run CHGVRAM.EXE from
a dosemu session within linux.
**** Fixes for the IBM Thinkpad (this could be the ANSWER!) ****
Michael Steiner has written a c program that runs under Linux and
allows one to set the video RAM of the WD90C24 family to either
512k or 1024k. This program seems to work on the Twinhead also,
but I have yet to verify that it works for using an external
monitor. If you test it on various machines, please email me.
/* T P D U A L S C A N . C
Author: Michael Steiner
<steiner@acm.org> <sti@zurich.ibm.com>
http://www.zurich.ibm.com/pub/sti/www/info.html
This program allows you to set videoram for dualscan equipped thinkpads
(at least for the 750Cs but probably also for others) to allow running
XFree86 without patching it. (normally you got all twice if the upper 512K
of videoram are not disabled)
*/
I have tried this on the Twinhead 5100S and it seems to work, but
I have not been able to test it on an external monitor.
Michael also makes available (on his web page) a patched XF86_SVGA
server!
4) How can I make my LCD screen sync correctly on starting/exiting X?
There is a bug that results in scrambled virtual consoles upon
exiting X. The cure for this is to reset the video modes in some way.
Many notebooks have a hot-key for lcd, crt, or simultaneous display.
Cycling this hot-key restores the virtual consoles. For others,
close and open the cover, or suspend/resume. This problem does
not occur when using the external display.
5) How can I fix the weird patches-of-black problem?
There is a problem using white window backgrounds. When windows
are scrolled with white bg, the scrolled part goes into reverse
video. The cure for this is not to use white backgrounds. Off-whites
are fine. This can be set as a default for all users in
/var/X11R6/lib/xinit/.Xresources with the following line (i.e., for xterm):
XTerm*Background: cornsilk
6) Should I configure X on the internal or external monitor first?
The dotclocks are different as detected by X-probeonly when the
lcd is selected versus when the crt is selected as the display. I
suggest using an external monitor while configuring X so that
all the necessary dotclocks appear. Otherwise, one gets
17 basically identical clocks that are useful only for 640x480.
7) My screen looks ok except for these funny little patterns...
The lcd display looks different depending on whether or not
simultaneous display is turned on (waves, flicker, dim, patterns). I
suspect this is due to a lack of termination of the external
monitor connection when the external monitor is not plugged in. The
fix is to set the display to lcd-only.
8) How do I set up XF86Config (example for Twinhead 5100S dualscan below)?
aa) read /var/X11R6/lib/doc/README.Config, VideoModes.doc
a) Select XF86_SVGA server with WD90C31 chipset.
b) Select "generic monitor" with the 25 Mhz dotclock and the
standard 640x480 VESA modeline. Begin with a video
bandwidth around 30 Mhz.
c) X -probeonly >& /tmp/x.out with external monitor connected
and selected (be careful with fixed frequency, non-multisync
monitors).
d) Edit XF86Config and paste in the 17 dotclocks found in /tmp/x.out
put one of the 25-28 Mhz dotclocks in place of the first
number in the VESA 640x480 modeline. This should work
for the LCD display to give 640x480x256. Now select the lcd
display.
e) Go to step (c). Repeat, this time pasting in the HorizSync
frequency or the VertRefresh frequency. Go to step
(c) again and repeat until both of these and the bandwidth
are filled in.
f) Now the lcd display should work.
g) To configure the external monitor, start with the standard
VESA modelines that match the dotclocks you have. I got
four basic dotclocks with a lot of nearby duplicates:
28.32 => 640x480 @63 Hz NI VESA
36.00 => 800x600 @56 Hz NI VESA
44.26 => 1024x768i @43.5 Hz Interlaced
64.97 => 1024x768 @ 60 Hz NI VESA
Of course, one cannot do the 1024 modes because without a
workaround, as one can only use 512k of video ram of the available
1024k VRAM as discussed above.
I think it is possible to get an 800x600 mode with very high
refresh rate. This depends on your monitor.
h) Send me info on what you find and post it to newsgroups
so I can develop this mini-HOWTO.
9) How do I get more info?
Useful (?) web sites and email addresses
This mini-HOWTO (latest version) and other links on
the WD90C24A2
http://www.castle.net/~darin/
Western Digital Web Site
http://www.wdc.com/
IBM Thinkpad video patches
http://www.zurich.ibm.com/pub/sti/www/info.html
(seem to have disappeared - but I have some
where this HOWTO is stored)
Twinhead Computer Corp. 1-800-995-8946
to ask for BBS #
As a shortcut to configuration, look into the program vgaset. This allows you to optimize the timings for each monitor interactively and dynamically within X.
Hope this is useful. I also hope that eventually someone gets a real driver going for the WD90C24A2 chipset so commonly used. I would be willing to help a little if I can. It would also be desireable to make up a patch for XFree86 3.1.1 to perform the
same function as does the DOS program CHGVRAM.EXE, or test tpdualscan.c on notebooks other than Thinkpads.
Darin Ernst
dernst@pppl.gov
=========================================================================== /var/X11R6/lib/XF86Config
=========================================================================== # $XFree86: xc/programs/Xserver/hw/xfree86/XF86Conf.cpp,v 3.6 1994/09/26 15:30:19 dawes Exp $ #
# Copyright (c) 1994 by The XFree86 Project, Inc.
#
# ********************************************************************** # Refer to the XF86Config(4/5) man page for details about the format of # this file. This man page is installed as /usr/X11R6/man/man5/XF86Config.5x # *******************************
***************************************
# ********************************************************************** # Files section. This allows default font and rgb paths to be set # **********************************************************************
Section "Files"
RgbPath "/usr/X11R6/lib/X11/rgb"
# Multiple FontPath entries are allowed (which are concatenated together), # as well as specifying multiple comma-separated entries in one FontPath # command (or a combination of both methods)
FontPath "/usr/X11R6/lib/X11/fonts/misc/" # XCOMM FontPath "/usr/X11R6/lib/X11/fonts/Type1/" # XCOMM FontPath "/usr/X11R6/lib/X11/fonts/Speedo/"
FontPath "/usr/X11R6/lib/X11/fonts/75dpi/"
FontPath "/usr/X11R6/lib/X11/fonts/100dpi/"
EndSection
# ********************************************************************** # Server flags section.
# **********************************************************************
Section "ServerFlags"
# Uncomment this to cause a core dump at the spot where a signal is # received. This may leave the console in an unusable state, but may # provide a better stack trace in the core dump to aid in debugging
# NoTrapSignals
# Uncomment this to disable the <Crtl><Alt><BS> server abort sequence
# DontZap
EndSection
# ********************************************************************** # Input devices
# **********************************************************************
# ********************************************************************** # Keyboard section
# **********************************************************************
Section "Keyboard"
Protocol "Standard"
# when using XQUEUE, comment out the above line, and uncomment the # following line
# Protocol "Xqueue"
AutoRepeat 500 5
ServerNumLock
# Specifiy which keyboard LEDs can be user-controlled (eg, with xset(1))
Xleds 1 2 3
# To set the LeftAlt to Meta, RightAlt key to ModeShift, # RightCtl key to Compose, and ScrollLock key to ModeLock:
# LeftAlt Meta
# RightAlt ModeShift
# RightCtl Compose
# ScrollLock ModeLock
EndSection
# ********************************************************************** # Pointer section
# **********************************************************************
Section "Pointer"
Protocol "PS/2"
Device "/dev/mouse"
# When using XQUEUE, comment out the above two lines, and uncomment # the following line.
# Protocol "Xqueue"
# Baudrate and SampleRate are only for some Logitech mice
BaudRate 9600
SampleRate 150
# Emulate3Buttons is an option for 2-button Microsoft mice
Emulate3Buttons
# ChordMiddle is an option for some 3-button Logitech mice
# ChordMiddle
EndSection
# ********************************************************************** # Monitor section
# **********************************************************************
# Any number of monitor sections may be present
Section "Monitor"
Identifier "LCD Screen"
VendorName "Sharp"
ModelName "Unknown"
# Bandwidth is in MHz unless units are specified
Bandwidth 90 # changed from 29
# HorizSync is in kHz unless units are specified.
# HorizSync may be a comma separated list of discrete values, or a # comma separated list of ranges of values.
# NOTE: THE VALUES HERE ARE EXAMPLES ONLY. REFER TO YOUR MONITOR'S # USER MANUAL FOR THE CORRECT NUMBERS.
HorizSync 35.36 # X -probeonly says
# HorizSync 30-64 # multisync # HorizSync 31.5, 35.2 # multiple fixed sync frequencies # HorizSync 15-25, 30-50 # multiple ranges of sync frequencies
# VertRefresh is in Hz unless units are specified.
# VertRefresh may be a comma separated list of discrete values, or a # comma separated list of ranges of values.
# NOTE: THE VALUES HERE ARE EXAMPLES ONLY. REFER TO YOUR MONITOR'S # USER MANUAL FOR THE CORRECT NUMBERS.
VertRefresh 67.36 # X -probeonly says
# VertRefresh 50-100 # multisync # VertRefresh 60, 65 # multiple fixed sync frequencies # VertRefresh 40-50, 80-100 # multiple ranges of sync frequencies
# Modes can be specified in two formats. A compact one-line format, or # a multi-line format.
# A generic VGA 640x480 mode (hsync = 31.5kHz, refresh = 60Hz) # These two are equivalent
# ModeLine "640x480" 25.175 640 664 760 800 480 491 493 525
Mode "640x480"
DotClock 28.29 # 25.175
HTimings 640 664 760 800
VTimings 480 491 493 525
EndMode
# These two are equivalent
# ModeLine "1024x768i" 45 1024 1048 1208 1264 768 776 784 817 Interlace
# Mode "1024x768i"
# DotClock 45
# HTimings 1024 1048 1208 1264
# VTimings 768 776 784 817
# Flags "Interlace"
# EndMode
EndSection
Section "Monitor" #------------------------- 2nd monitor section
Identifier "DX17F"
VendorName "MAG"
ModelName "DX17F"
Bandwidth 100 # changed; from manual
HorizSync 30-64 # multisync; also from manual
VertRefresh 50-100 # multisync; also from manual
# A generic VGA 640x480 mode (hsync = 31.5kHz, refresh = 60Hz)
ModeLine "640x480" 28.32 640 664 760 800 480 491 493 525
# VESA 1024x768@60Hz Non-Interlaced mode # Horizontal Sync = 48.4kHz
# Timing: H=(0.12us, 2.22us, 2.58us) V=(0.06ms, 0.12ms, 0.60ms)
ModeLine "1024x768" 65 1024 1032 1176 1344 768 771 777 806 -hsync -vsync
# 1024x768 Interlaced mode
ModeLine "1024x768i" 45 1024 1048 1208 1264 768 776 784 817 Interlace
# VESA 800x600@56Hz Non-Interlaced mode # Horizontal Sync = 35.1kHz
# Timing: H=(0.67us, 2.00us, 3.56us) V=(0.03ms, 0.063ms, 0.70ms) #
# name clock horizontal timing vertical timing flags
ModeLine "800x600" 36 800 824 896 1024 600 601 603 625
EndSection
############################################################################### #
# OFFICIAL VESA Monitor timings + IBM Standards + other generic modes - # TRY THESE FIRST # Contributor: Thomas Roell [roell@xinside.com] # Contributor: David Wexelblat [dwex@xfree86.org] # Last Edit Date: 10/7/93
#
# Mode Refresh Hor. Sync Dot-clock Interlaced? VESA?
# ------------------------------------------------------------ # 640x480 60Hz 31.5k 25.175M No No # 640x480 60Hz 31.5k 25.175M No No # 640x480 63Hz 32.8k 28.322M No No #
640x480 70Hz 36.5k 31.5M No No # 640x480 72Hz 37.9k 31.5M No Yes # 800x600 56Hz 35.1k 36.0M No Yes # 800x600 56Hz 35.4k 36.0M No No # 80
0x600 60Hz 37.9k 40.0M No Yes # 800x600 60Hz 37.9k 40.0M No No # 800x600 72Hz 48.0k 50.0M No Yes # 1024x768i 43.5Hz 35.5k 44.9M Yes No # 1024x
768 60Hz 48.4k 65.0M No Yes # 1024x768 60Hz 48.4k 62.0M No No # 1024x768 70Hz 56.5k 75.0M No Yes # 1024x768 70Hz 56.25k 72.0M No No # 1024x768
76Hz 62.5k 85.0M No No # 1280x1024i 44Hz 51kHz 80.0M Yes No # 1280x1024i 44Hz 47.6k 75.0M Yes No # 1280x1024 59Hz 63.6k 110.0M No No # 1280x1024
61Hz 64.24k 110.0M No No # 1280x1024 74Hz 78.85k 135.0M No No #
############################################################################### #
# 640x480@60Hz Non-Interlaced mode
# Horizontal Sync = 31.5kHz
# Timing: H=(0.95us, 3.81us, 1.59us), V=(0.35ms, 0.064ms, 1.02ms) #
# name clock horizontal timing vertical timing flags # "640x480" 25.175 640 664 760 800 480 491 493 525 #
# Alternate 640x480@60Hz Non-Interlaced mode # Horizontal Sync = 31.5kHz
# Timing: H=(1.27us, 3.81us, 1.27us) V=(0.32ms, 0.06ms, 1.05ms) #
# name clock horizontal timing vertical timing flags # "640x480" 25.175 640 672 768 800 480 490 492 525 #
# 640x480@63Hz Non-Interlaced mode (non-standard) # Horizontal Sync = 32.8kHz
# Timing: H=(1.41us, 1.41us, 5.08us) V=(0.24ms, 0.092ms, 0.92ms) #
# name clock horizontal timing vertical timing flags # "640x480" 28.322 640 680 720 864 480 488 491 521 #
# 640x480@70Hz Non-Interlaced mode (non-standard) # Horizontal Sync = 36.5kHz
# Timing: H=(1.27us, 1.27us, 4.57us) V=(0.22ms, 0.082ms, 0.82ms) #
# name clock horizontal timing vertical timing flags # "640x480" 31.5 640 680 720 864 480 488 491 521 #
# VESA 640x480@72Hz Non-Interlaced mode # Horizontal Sync = 37.9kHz
# Timing: H=(0.76us, 1.27us, 4.06us) V=(0.24ms, 0.079ms, 0.74ms) #
# name clock horizontal timing vertical timing flags # "640x480" 31.5 640 664 704 832 480 489 492 520 #
# VESA 800x600@56Hz Non-Interlaced mode # Horizontal Sync = 35.1kHz
# Timing: H=(0.67us, 2.00us, 3.56us) V=(0.03ms, 0.063ms, 0.70ms) #
# name clock horizontal timing vertical timing flags # "800x600" 36 800 824 896 1024 600 601 603 625 #
# Alternate 800x600@56Hz Non-Interlaced mode # Horizontal Sunc = 35.4kHz
# Timing: H=(0.89us, 4.00us, 1.11us) V=(0.11ms, 0.057ms, 0.79ms) #
# name clock horizontal timing vertical timing flags # "800x600" 36 800 832 976 1016 600 604 606 634 #
# VESA 800x600@60Hz Non-Interlaced mode # Horizontal Sync = 37.9kHz
# Timing: H=(1.00us, 3.20us, 2.20us) V=(0.03ms, 0.106ms, 0.61ms) #
# name clock horizontal timing vertical timing flags # "800x600" 40 800 840 968 1056 600 601 605 628 +hsync +vsync #
# Alternate 800x600@60Hz Non-Interlaced mode # Horizontal Sync = 37.9kHz
# Timing: H=(1.20us, 3.80us, 1.40us) V=(0.13ms, 0.053ms, 0.69ms) #
# name clock horizontal timing vertical timing flags # "800x600" 40 800 848 1000 1056 600 605 607 633 #
# VESA 800x600@72Hz Non-Interlaced mode # Horizontal Sync = 48kHz
# Timing: H=(1.12us, 2.40us, 1.28us) V=(0.77ms, 0.13ms, 0.48ms) #
# name clock horizontal timing vertical timing flags # "800x600" 50 800 856 976 1040 600 637 643 666 +hsync +vsync #
# 1024x768@43.5Hz, Interlaced mode (8514/A standard) # Horizontal Sync = 35.5kHz
# Timing: H=(0.54us, 1.34us, 1.25us) V=(0.23ms, 0.23ms, 0.93ms) #
# name clock horizontal timing vertical timing flags # "1024x768i" 44.9 1024 1048 1208 1264 768 776 784 817 Interlace #
# VESA 1024x768@60Hz Non-Interlaced mode # Horizontal Sync = 48.4kHz
# Timing: H=(0.12us, 2.22us, 2.58us) V=(0.06ms, 0.12ms, 0.60ms) #
# name clock horizontal timing vertical timing flags # "1024x768" 65 1024 1032 1176 1344 768 771 777 806 -hsync -vsync #
# 1024x768@60Hz Non-Interlaced mode (non-standard dot-clock) # Horizontal Sync = 48.4kHz
# Timing: H=(0.65us, 2.84us, 0.65us) V=(0.12ms, 0.041ms, 0.66ms) #
# name clock horizontal timing vertical timing flags # "1024x768" 62 1024 1064 1240 1280 768 774 776 808 #
# VESA 1024x768@70Hz Non-Interlaced mode # Horizontal Sync=56.5kHz
# Timing: H=(0.32us, 1.81us, 1.92us) V=(0.05ms, 0.14ms, 0.51ms) #
# name clock horizontal timing vertical timing flags # "1024x768" 75 1024 1048 1184 1328 768 771 777 806 -hsync -vsync #
# 1024x768@70Hz Non-Interlaced mode (non-standard dot-clock) # Horizontal Sync=56.25kHz
# Timing: H=(0.44us, 1.89us, 1.22us) V=(0.036ms, 0.11ms, 0.53ms) #
# name clock horizontal timing vertical timing flags # "1024x768" 72 1024 1056 1192 1280 768 770 776 806 -hsync -vsync #
# 1024x768@76Hz Non-Interlaced mode
# Horizontal Sync=62.5kHz
# Timing: H=(0.09us, 1.41us, 2.45us) V=(0.09ms, 0.048ms, 0.62ms) #
# name clock horizontal timing vertical timing flags # "1024x768" 85 1024 1032 1152 1360 768 784 787 823 #
# 1280x1024@44Hz, Interlaced mode
# Horizontal Sync=51kHz
# Timing: H=(0.02us, 2.7us, 0.70us) V=(0.02ms, 0.24ms, 2.51ms) #
# name clock horizontal timing vertical timing flags # "1280x1024i" 80 1280 1296 1512 1568 1024 1025 1037 1165 Interlace #
# Alternate 1280x1024@44Hz, Interlaced mode (non-standard dot-clock) # Horizontal Sync=47.6kHz
# Timing: H=(0.42us, 2.88us, 0.64us) V=(0.08ms, 0.12ms, 0.96ms) #
# name clock horizontal timing vertical timing flags # "1280x1024i" 75 1280 1312 1528 1576 1024 1028 1034 1080 Interlace #
# 1280x1024@59Hz Non-Interlaced mode (non-standard) # Horizontal Sync=63.6kHz
# Timing: H=(0.36us, 1.45us, 2.25us) V=(0.08ms, 0.11ms, 0.65ms) #
# name clock horizontal timing vertical timing flags # "1280x1024" 110 1280 1320 1480 1728 1024 1029 1036 1077 #
# 1280x1024@61Hz, Non-Interlaced mode
# Horizontal Sync=64.25kHz
# Timing: H=(0.44us, 1.67us, 1.82us) V=(0.02ms, 0.05ms, 0.41ms) #
# name clock horizontal timing vertical timing flags # "1280x1024" 110 1280 1328 1512 1712 1024 1025 1028 1054 #
# 1280x1024@74Hz, Non-Interlaced mode
# Horizontal Sync=78.85kHz
# Timing: H=(0.24us, 1.07us, 1.90us) V=(0.04ms, 0.04ms, 0.43ms) #
# name clock horizontal timing vertical timing flags # "1280x1024" 135 1280 1312 1456 1712 1024 1027 1030 1064 ###############################################################################
# ********************************************************************** # Graphics device section
# **********************************************************************
# Any number of graphics device sections may be present
#Section "Device"
# Identifier "Generic VGA"
# VendorName "Unknown"
# BoardName "Unknown"
# Chipset "generic"
# VideoRam 256
# Clocks 25.2 28.3
#EndSection
Section "Device"
# SVGA WD90c24a2 in Twinhead Slimnote with simultaneous display
Identifier "WD90C24A2"
VendorName "Western Digital"
BoardName "RocketChip"
Chipset "wd90c31"
# begin first config with lcd only display # VideoRam 512
# Clocks 28.29 28.32 28.30 28.29 28.30 28.32 28.29 28.30 # Clocks 28.30 28.31 28.29 28.30 28.30 28.31 28.30 28.30 # Clocks 49.79
# end first config with lcd only display
# begin second config with crt only display; let it detect VRAM # VideoRam 1024
Clocks 25.15 28.32 64.97 35.96 25.15 28.30 64.92 36.00
Clocks 25.15 28.30 64.92 35.96 25.17 28.41 64.97 35.96
Clocks 44.26
# end second config with crt only display
EndSection
# ********************************************************************** # Screen sections
# **********************************************************************
# The colour SVGA server
Section "Screen"
Driver "svga"
Device "WD90C24A2"
# Monitor "LCD Screen"
Monitor "DX17F"
Subsection "Display"
Depth 8
Modes "640x480" "800x600" "1024x768" # "1024x768i"
ViewPort 0 0
# Virtual 1024 768
EndSubsection
EndSection
# The 16-colour VGA server
#Section "Screen"
# Driver "vga16"
# Device "Generic VGA"
# Monitor "Generic Monitor"
# Subsection "Display"
# Modes "640x480"
# ViewPort 0 0
# Virtual 800 600
# EndSubsection
#EndSection
# The Mono server
#Section "Screen"
# Driver "vga2"
# Device "WD90C24A2"
# Monitor "LCD Screen"
# Subsection "Display"
# Modes "640x480"
# ViewPort 0 0
# Virtual 1024 768
# EndSubsection
#EndSection
see ya. --Conrad
Conrad Albrecht-Buehler Northwestern University conrada-b@nwu.edu