svgalib screen sync once more...

[Daniel Reuter <reuter@Uni-Hohenheim.DE>]

Hi folks,

Some of you perhaps read the thread about my svgalib screen sync problems 
with the DSTN 640x480 screen of my laptop and ct65535 chipset.
One of the problems I could solve:
My console isn't scrumbled any more when I switch back from graphics to
textmode, I achieved this by using TextClockFreq 20.0 (strange to me, as
this is lower than in standard VESA modes - If someone could enlighten
me?), but it works.
The other problem grew even weirder:
When I switch to graphics mode with dvisvga or zgv, the LCD-screen is
scrumbled and shows very strange patterns. I can restore this with
LCD/CRT/LCD switch (also was like that in X).
When I switch to graphics mode with gs or gnuplot, I DON'T have this
problem.
So is this a problem with svgalib configuration or a bug in dvisvga/zgv?
(The latter would perhaps mean, that X has the same bug) (or even a bug in
the hardware?)
If I use the UseModeline option and change the modelines, I get absolutely
no effect, the screen looks exactly the same, no matter what kind of
modeline I specify (of course modesize always stays the same (640x480)).
TIA,
Regards,
Daniel