On Sun, 21 Apr 2002, Leonard Sitongia wrote: > I'm trying to get my laptop to display on both the LCD and an external CRT. > > Often the setting will cause the LCD to start rapidly brightening, with it > appearing to burn in. I don't know what to call this. It looks bad, so I > immediately power it off (ctrl-alt-backspace doesn't kill it, so X probably > isn't running far enough along to do that). > > What causes this? Is it really as bad as it seems? :-) > > I'm tempted to hypothesize that this is caused by driving the LCD at a higher > res/rate than it supports, but it's not clearly the case, because I can > sometimes get it to work (it=driving the CRT at a higher res than the LCD), > but it seems to depend on whether the LCD and CRT are both initially on (via > Fn-F8).
In my experience (#9 Ticket To Ride IV, Permedia-3 1600SW, SGI 1600SW), the incorrect polarity of the hsync and/or vsync causes the *exact* effect you mention. In my case, it had _nothing_ to do with the rate at which the LCD was being driven. That said, LCDs can be fried, and your case may be different. I didn't wait to see how a prolonged exposure to this effect affected the LCD. :-) Ctrl-Alt-Backspace always killed the X server and cleared the effect. ======================================================================== Nikola Miljanic [Nick] | | Metro Link, Inc. [EMAIL PROTECTED] | | http://www.metrolink.com ======================================================================== progress [n.] 1. In computing; advancing from one error message to the next _______________________________________________ Xpert mailing list [EMAIL PROTECTED] http://XFree86.Org/mailman/listinfo/xpert
