Re: powerbook wakeup/boot display issue
I've seen this issue quite often..
My PB5,7 do have the same symptoms... The whole thing corrects itself by
changing back and forth from console(running radeonfb) and X, this is often
corrected by making the switch once, however... twice and more is know to be
needed at times of need ;)
If it boots with the problem... it normally corrects itself when X starts...
here to I've been forced to switch back and forth till it corrects itself.
To me, it is bright an flickering.
Never happens is X starts normal, an do occur if switched to console(fb)
On Wednesday 17 January 2007 15:19, Johannes Berg wrote:
> On Wed, 2007-01-17 at 22:49 +0900, Joseph Sanger wrote:
> > http://forums.gentoo.org/viewtopic-t-473838.html
> >
> > What do you think?
>
> I don't think that makes sense. The higher the applied voltage is, the
> more twisted the crystals become and the pixel is black. So how can a
> white display have any adverse effect when that means that there is no
> voltage on the pixels?
>
> To me, the other explanation (backlight on, lcd off) makes more sense
> because I imagine that if you turn off the lcd then it'll stop
> refreshing and start losing voltage in the pixels meaning it'll slowly
> go to white, probably from the edges to the center since the electrons
> have to flow out the edges...
>
> The cite you linked is actually taken from
> http://tstotts.net/linux/gentoopb.html but that has no explanation of
> what should cause this "process of frying the video card and panel
> permanently!"
>
> But keep in mind that I don't have any idea about electronics. Maybe we
> should bring this question to someone more knowledgeable.
>
> > BTW I forgot to mention, it sometimes happens on boot as well (maybe 1
> > in 10?). Once it happened just before the penguin appears at the top of
> > the screen, but usually just before the debian login window.
>
> The first instance is when the kernel driver initialises the panel, and
> the second when X starts up, so those points clearly make sense. I
> haven't seen the effect in a long time though I did see it a few times.
>
> johannes
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