KPW flashing issue --every single page arghhh

[NullNix]

Originally Posted by mgrimace

I was wondering if other people noticed any relation to heat as well?

Well, yes. That is "working as designed": e-ink hardware even includes temperature measurement for precisely this reason. As I understand it, the 'waveforms' the Kindle uses to adjust the screen display without flashing are tuned to a particular range of viscosities in the e-ink, and thus to a particular range of temperatures: if the temperature goes above or below that range, it has to fall back to a full dark/light reset on every change. (If you go too hot, even that fails and you start seeing screen misbehaviour, but as this requires you to stick your Kindle over a steamer and raise it to 60C or thereabouts, this is unlikely to be a problem. If you get too cold, of course, the screen freezes and is ruined.)

[mgrimace]

Originally Posted by NullNix

Well, yes. That is "working as designed": e-ink hardware even includes temperature measurement for precisely this reason. As I understand it,

Thank you, I appreciate the explanation , I was worried it might be defective but that makes sense

[Rosie-Posie]

I noticed my kindle refreshes every page if I slide to turn the page, and if I just tap, then it refeshes every 6th page or so - didn't count, but I guess it's 6 if everyone says so.


edit: hmmm, scratch that, I just tried again now, and it's refreshing every 6th page no matter how I turn the pages... but I swear it was doing it before

[NullNix]

Originally Posted by Rosie-Posie

edit: hmmm, scratch that, I just tried again now, and it's refreshing every 6th page no matter how I turn the pages... but I swear it was doing it before

This may be timing-based. I haven't looked at the code (ask ixtab, ixtab knows everything!) but from observation, I suspect that the Kindle can only go from one page to the next without flashing if it can prerender the current and next pages in some sort of double-buffer so as to figure out what pixels need flipping in advance (and it can only do that if neither page has any images on). It looks like this will suffice for turning in both directions, from A->B and also from B->A. This happens in the background for a bunch of future page transitions and takes a few seconds, so if you move forward too fast, you'll eventually 'run out' and go back to flashing every time, until you wait a few seconds for the prerendering to catch up again. (Of course, if the Kindle is also busy indexing, sizing screensaver images for the screensaver hack &c it could take longer). As you move forward, it throws away pages you went past a while back (surely to save memory), so if you go more than a few pages backwards it has to start flashing again.

This is old behaviour, as old as the non-flashing update: the K3 and K4 worked the same way.