On Tuesday 04 September 2001 17:06, Luca wrote:
> Hi,
> I'm a new Linux user and a new member of newbie discussion list.
>
> I installed the Linux Mandrake 8.0 version on my DUAL - ERA1000 notebook:
> Processor Intel 266 MHz MMX - 64 Mb RAM -
> LCD 14.1" TFT - VGA 1024x768 - graphic chip Chips and Technologies 65555 -
> PCI - CD-ROM Teac CD-220EA
>
> I set the following parameters:
> graphic board: Chips and Tecnologies CT65555
> monitor: generic LCD panel 1024 x 768
> resolution: 1024x768 - 16 bit
>
> but it doesn't work properly:
> the screen size doesn't fit all the LCD area and therefore, because the
> 1024x768 resolution is remapped into a smaller area, the characters and the
> icons aren't clear and well defined. There are also a lot of noise on LCD
> when I move the mouse and when there is video activity. I tried many others
> monitor settings but without solution.
>
> Please, is there someone who can help me ?
> Thank you and Best Regards !
>
> Luca Leopardi (Italy)
The C&T 65555 drivers were assembled at XFree.org without proper attentin
to modelines.
First of all, use expert mode to install and select XFree-3.3.6 the XFree-4
series does not support this one well at all.
Next, after you install, boot in console mode and use your favorite editor--I
recommend you install joe and set the .joerc in root's directory to the style
you want, either WordStar (stabdard) or copy /etc/joe/jmacs there for emacs
keys or /etc/joe/jpicorc for pico behavior--In any case, joe provides
on-screen help for cursor movement and edit commands--
Once that is done, use the su command to gain root access and edit the file
joe /etc/X11/XF86Config
browse down through the modelines and find those that correspond to 1024x768
at 60Hz refresh. Erase all the others.
Now on the modeline for 1024x768 at 60Hz, make sure of the following--it will
look like this:
# 1024x768 @ 60 Hz, 48.4 kHz hsync
Modeline "1024x768" 65 1024 1032 1176 1344 768 771 777 806 -hsync
-v
change that to values like this
# 1024x768 @ 60 Hz, 48.4 kHz hsync
Modeline "1024x768" 65 1022 1032 1176 1344 764 771 777 806 -hsync
-v
on the first two numbers for hsync and vsync respectively keep the largest
number yielded by subtracting to 15 on horizontal (first two numbers) and 7
on the vertical (fifth and sixth numbers after the 65)
Now the other problem--the 65555 doesn't really clock fast enough to support
this mode.
In the devices section of the file where the 65555 is identified and you see
the line
Option "sw_cursor"
(just search for sw_cur)
add the following
DACSpeed (Some number between 25.0 and 60.0)
Chipset "ct65555"
Example DACSpeed 53.1
That particular setting worked for a 1024x768 screen on a Panasonic CF-62
notebook that uses the same chip. You may have to experiment with that clock
and also watch the temperature of the chip. Take the lowest seting that
provides an acceptable screen.
Do not attempt higher refresh rates--most probably you are using a 70Hz
refresh rate now, and erasing that line will stop the system from trying to
use it.
Close your edit, try startx, bounce out with ctrl-alt-backspace and edit
again until you have it tuned satisfactorily--usually I like to halve the
ranges and try the opposite direction when I am obvioulsy going the wrong way.
When you have a display that suits, congratulate yourself--you have just
accomplished the same job the C&T engineers and your notebook builder
engineers did for windows (and could have done for linux if their managers
believed a market was there).
The 65555 is one of the most cranky chipsets to get running right, and it is
prone ot overheating if overdriven, so select the lowest frequencies that
give satisfactory display.
Civileme
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