Date: Wed, 11 Oct 2000 21:07:29 -0500 From: Laurence Berland <stuyman@confusion.net> To: Dan Yergeau <yergeau@gloworm.Stanford.EDU> Cc: freebsd-mobile@FreeBSD.ORG Subject: Re: safety issues creating modelines for laptop displays Message-ID: <39E51CE1.225C37A9@confusion.net> 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 > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-mobile" in the body of the message -- Laurence Berland Intern, Flooz.com Northwestern '04 stuyman@confusion.net To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-mobile" in the body of the message
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