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Date:      Tue, 22 Nov 2005 12:46:16 +0100
From:      Tino Boss <tino.boss.1@student.unibe.ch>
To:        freebsd-questions@freebsd.org
Cc:        Eric Murphy <eam404@earthlink.net>
Subject:   Re: Im trying to find the H and V sync rates for the LCD in
Message-ID:  <43830508.7060700@student.unibe.ch>
In-Reply-To: <43827FFF.2040901@earthlink.net>
References:  <437A8847.7040101@earthlink.net> <43827015.1070003@students.unibe.ch> <43827FFF.2040901@earthlink.net>

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Eric Murphy wrote:

>>     Expect the problem is that if you dont know the H and V rates it 
>> wont generate them ;( 
>
If you put a modeline you tell the video chip exactly what to do. 
There's no H and V sync rates needed because they are implied*.
If you have a fixed resolution the only variable will be the clock which 
will determine the snync rates. Just take a reasonable value there.
As Ted pointed out TFT's shouldn't be too picky about sync rates; so 
don't worry too much and give it a go.

An easy alternative: boot up a Live-CD (Knoppix, Freesbie) with X and 
check the xorg log (probably in /var/log). There you can find some 
values that work.

regards
Tino

* There may be needed an hsync/vsync entry in xorg.conf though. Just 
specify a range big enough.



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