2010/6/8 Buck Pyland <b...@buckpyland.com>: > On Tue, Jun 8, 2010 at 2:04 AM, patrick keshishian <pkesh...@gmail.com>wrote: > >> On Mon, Jun 7, 2010 at 11:08 PM, Buck Pyland <b...@buckpyland.com> wrote: >> > Related to what you mentioned, I found another wsconsctl setting, >> > display.backlight. It apparently accepts a value from 0 to 100 with a >> value >> > of 0 to 99 treated as 0. Setting it to 0 causes the same effect I have >> been >> > getting with the screen blanker in wscons and X. Setting it to 100 puts >> it >> > back to normal. >> >> This is more for my own curiosity sake. I hope you don't mind. >> >> I have an ibook g4, and for me display.backlight settings 0-99 turn >> the back-light completely off, and 100 turns it on. It seems to behave >> like an on/off switch but with many values for the "off" setting. >> >> If I'm reading your posts correctly, you are saying your ibook's >> back-light never goes off, but rather has two levels of on: "normal" >> (display.backlight=100) and "full on" (display.backlight=0..99)? >> > > Well, I actually have a PowerBook G4 Titanium colloquially known as a > TiBook, but otherwise you're correct. If you set display.backlight to any > value from 0 to 99, it shows in wsconsctl as 0. Setting it to 100, or > higher, actually sets it to 100. > > >> If I've read you correctly, are you able to adjust display.brightness >> while in the "full on" position, and does it have any effect on the >> brightness? >> > > No, setting display.brightness has no visible effect while display.backlight > = 0. > > As an aside, setting display.brightness to 0 does not make the display > totally black. The display is dim, but still visible. I don't know for > certain if you can still get screen burn-in when it's like that, but I > believe it's unlikely. > > I'd like to find a utility, or write my own, to completely erase the screen > until you press a key. I know you can just send the terminal escape sequence > to move the cursor to home and clear to the end of the screen, but I'd still > need to turn the cursor off or something to get the same results. I'll work > on it when I get time. > > ... and if I've misread you, just ignore this post :) >> > > Not at all.
You can try a reset of the PMU which may solve your problem: http://support.apple.com/kb/HT1431?viewlocale=en_US > Buck
