Subject: A call for help - _again_ - with X! From: 9128057f@levels.unisa.edu.au Date: 28 Nov 1992 22:59:54 +1030
Greetings all ...
Well, I posted a message a couple of weeks ago about problems running X and
got an absolute _zero_ response. Whether this was a problem with my news
server not spitting it out or with apathy within the group I don't know, but
what I do know is that if I don't get a response then I'll be forced into
dumping linux and X and switching to another os, such as o/s2. I just can't
accept a non-gui interface! So, a post of my problem follows - if anyone knows
of an answer or of somewhere to point me to i'd appriciate it. (and yes, i have
tried those "just run this to get your modes" programs, of which none worked
(obviously)) ...
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Ok, here's my problem: I ftp'ed down Linux from tsx-11 about a week ago
and set about installing it. I installed the complete base system including
compilers and X. The major problem that I am having now is with the Xconfig
file, mainly relating to monitor. I have determined that my graphics card
(an NT-200B, aka w/digital paradise) has clock rates of (at least) 25 and 28
mhz for 640x480x256. And so, I configured X with the pvga1 chipset, 640 480
virtual and 512k vram. This, for the moment, is fine for me. So, after a
while, it stopped complaining about my gfx setup. Great, or so I thought,
until I got to configuring the monitor ... <grimace> I tried the Vesa/ibm
standards for 640x480 in the different clock rates all to no avail, and I even
got to the stage of throwing in random changes to see if I would strike it
lucky (!) ... well, as you can see, I have failed.
The monitor I'm using is a total peripherals TP250P multiscan monitor. Its
pretty cheap, but has the following specs:
.29 dp
horizontal sync: 30.5 to 36 khz
vertical sync: 50 to 90 khz (automatically)
max rez: 1024x768
video band width : 40Mhz
Active display area: 248mm (h) by 186mm (v)
The manual also has a timing chart, and I tried feeding in what seemed like
near/similar values to those stated as "normal" but with no good result. It
gives a square wave like the following:
____________ ________
video: __________| |_______|
|C | D |E |
____ ___________________ _________
Horizontal: |__| |__|
|B |
| A |
____________ ________
video: __________| |_______|
| Q | R |S|
_ ____________________ ___________
Vertical: |__| |__|
|P |
| O |
Anyway, the ranges A,B,C,D,E and O,P,Q,R,S have the following listed times
- note that range 'D' lies between ranges 'C' and 'E', simillarly for 'R'.
(for 640x480 VGA, horiz. freq = 31.5khz, vert. freq = 60hz, -ve h & v sync
polarity):
A: 31.78 (micro secs)
B: 3.81
C: 1.91
D: 25.42
E: 0.64
O: 16.68 (milli secs?)
P: 0.06
Q: 1.05
R: 15.25
S: 0.32
The display that I have managed to get ranges between a large smear on the
screen to a static (non completely unreadable) vertical image with the horiz.
part "ripped" across a few screens.
If ANYONE can help me I'd be very gratefull!!! If any additional info is
required to help solve this, I can do my best! Reply via post or Email (please
use the @lux.levels account if possible) - many many thanks in advance! :-)
Neil.