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Date:      Wed, 11 Oct 2000 16:45:11 -0700
From:      Dan Yergeau <yergeau@gloworm.Stanford.EDU>
To:        freebsd-mobile@freebsd.org
Cc:        yergeau@gloworm.Stanford.EDU
Subject:   safety issues creating modelines for laptop displays
Message-ID:  <200010112345.QAA17684@gloworm.Stanford.EDU>

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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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