Paul, [EMAIL PROTECTED] said: >Hi, > >The LCD backlight on son's Wallstreet running 10.2.8 sometimes refuses >to illuminate, in spite of attempts to adjust it up using the >brightness button above the keyboard. > >It works fine under 9.2.2, illuminating over the full brightness range. > >It looks like a software problem. Does any one have any clues as to >what is going wrong and how to fix it? > Paul, if you mean that the display backlighting is totally turned off and that this happens after the powerbook was sleeping and lost power so it got turned off or similar situations, then that problem can to my knowledge only be cured by booting into OS 9 once, from disk or CD. I have normally have to do it twice as my computer crashes the first time I boot into OS 9, after I have this problem.
If you want to boot from OS 9 internally and the display backlighting is off you can see what you're doing by pointing a spotlight to the screen. Then choose to boot from the OS 9 system the normal way. You may find it more convenient to pop in a OS 9 CD and restart with the start button and press down "c". I suppose there's some PRAM setting for Quartz or something that goes bonkers when this problem occur (usually the display goes dark only when Quartz first kicks in). From your description I guess you're discovering the problem *after* one situation when the machine lost power and you have booted anew and then put it to sleep. In some situations pressing the light button back and forth may finally turn on the display until next time you set it to sleep or reboot. In my experience booting into OS 9 is the only thing that can reliably cure this to allow for normal restarts and sleep. If someone knows exactly why this problem occur and whether one can get to this setting in some other way, that would be interesting to know. I do seem to remember one can get rid off the ATI drivers and this problem will go away, but of course one wonders if that will make graphics slower. My guess it will not as Quartz graphics in a Wallstreet is typically calculated in the CPU and RAM anyway (as there is no QE support nor enough RAM to do hardware accelaration). I guess the driver can be taken offline by removing "Sys tem:Library:Extensions:ATIRagePro.kext", but I'm not completely positive this is the right file and I haven't verified that this problem actually goes away by removing it. Maybe someone else can fill in here. Or just try and see for yourself. -- G-Books is sponsored by <http://lowendmac.com/> and... Small Dog Electronics http://www.smalldog.com | Refurbished Drives | -- Check our web site for refurbished PowerBooks | & CDRWs on Sale! | Support Low End Mac <http://lowendmac.com/lists/support.html> G-Books list info: <http://lowendmac.com/lists/g-books.html> --> AOL users, remove "mailto:"; Send list messages to: <mailto:[EMAIL PROTECTED]> To unsubscribe, email: <mailto:[EMAIL PROTECTED]> For digest mode, email: <mailto:[EMAIL PROTECTED]> Subscription questions: <mailto:[EMAIL PROTECTED]> Archive: <http://www.mail-archive.com/g-books%40mail.maclaunch.com/> --------------------------------------------------------------- >The Think Different Store http://www.ThinkDifferentStore.com ---------------------------------------------------------------
