On Fri, Mar 14, 2003 at 11:37:12AM +0200, shlomo solomon wrote:
> On Friday 14 March 2003 10:15, Shachar Shemesh wrote:
> > shlomo solomon wrote:
> > >It's a new monitor and cable - and yes, of course you're right about DDC.
> >
> > Can you define custom and manually enter horizontal and vertical rates?
> > They should be documented in your monitor's manual. If not, you can send
> Not necessary - the values for the Generic 1600x1200 (as detected by Mandrake)
> seemed OK, but to be on the safe side, I did change them - using info from
> the manual. Here's what I have in XF86Config-4:
>
> Section "Monitor"
> Identifier "monitor1"
> VendorName "Generic"
> ModelName "1600x1200 @ 70 Hz"
> ## replaced 2 lines with data from Proview DX997 manual - shlomo - 12/3/03
> ## HorizSync 31.5-88.0
> ## VertRefresh 50-90
> HorizSync 30.0-98.0
> VertRefresh 50-160
What you did was not "on the safe side" - you put values higher than MDK's.
If they are from the monitor's reference, fine. Yours does, I think,
1600x1200 @ 75Hz (maybe a bit more).
>
> But my change didn't make any improvement. As Yedidyah pointed out, the
> modeline was the problem. But after GOOGLING quite a bit, I still have no
> idea what the various paramaters of the new modeline (created using xvidtune)
> are, or how to optimize it even more - as I already write, the changed
> modeline greatly improved the display, but it could still be better.
>
> BTW - I found a site that has a utility to compute the modeline, but not only
> didn't it work, but it made the display much worse - so I won't post the
> address here.
>
> Here's the modeline I added (after playing with svidtune). Can someone explain
> what it means.
> "1024x768" 94.50 1024 1072 1168 1376 768 769 772 820 +hsync +vsync
>
Yes. Read the excellent "XFree86 Video Timings HOWTO". In short -
the first is the rate in which pixels are drawn (Mhz), the second is the
X resolution, the three next are something about when to start/stop a
line, the four next are the same for vertical axis. You can get a very
good feeling about them by shrinking to the maximum the picture with
the monitor controls, turning to the maximum the brightness and contrast,
and then playing with xvidtune. When I say maximum I mean you should
clearly see a difference between a really black border, and the area
where the monitor does light a bit, but a "noise", not the real picture.
To get a semi-perfect picture, choose the highest dotclock (the first
number) possible - this is computable in theory, but it's easier to
simply try and see if X will accept it, and then play with xvidtune until
you are satisfied. BTW, you should rename the modeline to something of
your own (say "my1024x768") and use it in the screen section. This way
you make sure X uses it and does not fallback to some builtin.
BTW, (this paragraph written after actually looking at the modeline)
Y res 768 with the next number 769, means, IIRC, that you only have
one pixel between where the monitor starts to send stuff (in very
inaccurate words) and when it actually has to draw. You might want to
increase this ("Down", "Shorter" in xvidtune). And another - with
your monitor specs you should be able to get much higher dotclocks,
meaning, in the end, higher refresh rate (which is important for your
eyes). I think you can safely increase it to 120-125, and play with
xvidtune - you should get around 90Hz refresh rate.
>
> > them email and ask for info. I should warn you, however, that I searched
> > their site and couldn't find your model mentioned anywhere. They don't
> > even carry a "DX" series.
> Yes, I know - I guess the model number is different in Israel (just as some
> cars have different names in different countries -- Opel in most of Europe =
> Vauxhaul in England).
If/When you manage to find the "abroad" name, google again - good chances
to find a modeline. If not, you can contribute yours by sending to a
relevant place (some X ML, MDK, etc.).
>
>
> --
> Shlomo Solomon
> http://come.to/shlomo.solomon
> Sent by KMail (KDE 3.0.5a) on LINUX Mandrake 9.0
>
>
>
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