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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-mobile" in the body of the message
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