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Date: Wed, 11 Oct 2000 21:07:29 -0500
From: Laurence Berland <stuyman@confusion.net>
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To: Dan Yergeau <yergeau@gloworm.Stanford.EDU>
Cc: freebsd-mobile@FreeBSD.ORG
Subject: Re: safety issues creating modelines for laptop displays
References: <200010112345.QAA17684@gloworm.Stanford.EDU>
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AFAIK all of this is just sort of compatibility emulation stuff to make
it easy to use LCDs, since they don't have a tube that scans across the
screen the way a CRT does.  However, I'm not 100% positive so don't take
my word as fact.

Laurence

Dan Yergeau wrote:
> 
> Maybe I'm just being paranoid, but I definitely don't want to fry
> the tft display by "overdriving" it.
> 
> I've got a Dell Inspiron 5000e, with the rather new "ATI Rage 128
> Mobility LF (AGP)" and a 1400x1050 display (Samsung LTN150P1-L01).
> I've managed to get X to work (use the r128 driver built from the
> current source code in the XFree86 project's cvs repository), but
> I'm concerned about the about the vertical refresh rates of the
> modelines that I've seen.
> 
> I can't find any frequency specs on the display, at least not via
> Dell or Samsung
> (http://www.intl.samsungsemi.com/AM_LCD/LCD_Applications/Note_PC/notepc_LTN150P1L01.htm),
> and two of the modelines that I've seen on the linux-dell-laptops forum
> on www.egroups.com are:
> 
> # 86.1 Hz
> ModeLine "1400x1050" 155.00 1400 1464 1784 1912 1050 1052 1064 1090
> # 91 Hz
> ModeLine "1400x1050" 189.65 1400 1464 1784 1912 1050 1052 1064 1090
> 
> Windows 2000 reports a 60Hz refresh rate for the "monitor".
> 
> I've reduced the clock to 108.00 to get 60HZ for my config, but what
> I really want to know is if there is any potential for harm to the
> built-in display with higher frequencies (e.g. if I want to
> simultaneously drive an external monitor).
> 
> Thanks,
> 
> Dan
> 
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-- 
Laurence Berland
Intern, Flooz.com
Northwestern '04
stuyman@confusion.net


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