From: Matan Ziv-Av (matan@svgalib.org)
Date: Thu 15 Aug 2002 - 18:50:00 IDT
On Thu, 15 Aug 2002, Glyn wrote:
> Hello,
> I've been using 1.4.3 for my Trident Cyber9385 for several months.
> It identifies the card as a tvga9680, so I had to tweak the contents of
> tvga9680.regs to access most of the modes.However, it can't cope with
> the 1024x768 16bit modes, so Idecided to try out the testing releases
> when I noticed that they had better support for my card.
>
> After installing 1.9.16, I've been running into problems with specifying
> the HorizSync values for use on different modes.If I specify 31-35 (or
> use the default) then 640x480 works fine, but 1024x768 is not available.
> If I use 31-48.3, then I can use 1024x768, but 640x480 and 800x600 are
> unuseable (flickering or blank most of the time)
It is possible that the vertical limit is the problem. At 31-35 kHz,
svgalib uses 640x480 at 60 Hz. At 31-48.3 KHz, svgalib uses 640x480 at
72 Hz, and 1024x768 at 60Hz. If your LCD is limited to (for
example) 55-65 Hz, this explains what you see. Setting
VertRefresh 55 65
Will force svgalib to use 640x480@60Hz, even with the wider horizontal
range. It is best to take the numbers from your screen's documentation,
rather than trying to guess them.
--
Matan Ziv-Av. matan@svgalib.org
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