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Mad Scientist
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#272310 18-Jun-2020 23:16
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Involuntary autocorrect in operation on mobile device. Apologies in advance.

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Mad Scientist
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  #2507797 18-Jun-2020 23:17
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something about colour profile and a single pixel bricking phone!


(yes i watched it but it's a bit tricky to fully understand)

Involuntary autocorrect in operation on mobile device. Apologies in advance.

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  #2507850 19-Jun-2020 08:36
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I killed a phone once with a wallpaper - it was a very-high-res (almost gigapixel, from memory) shot of the moon, which I rescaled to appropriate size for the phone, but it still died horribly.


The user interface kept crashing on reboot, so there was no way to reset the wallpaper back again - a factory reset from recovery mode fixed it, of course; and almost everything self-restored from "the cloud" with the exception of a couple of work-related 2FA tokens (which is pretty much what you'd expect).


I thought at the time I'd just not been careful enough with resizing the wallpaper and I'd blown the memory buffer size(s) or something; but who knows?


There are many, many cases on the internet with Android dying due to wallpaper - seems a little fragile if you ask me!


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  #2507942 19-Jun-2020 11:03
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I don't know if I buy the explanation. For a start (255, 255, 243) looks nothing like the pixel he's talking about (it would be pretty much a yellowish white). If what he's saying is true then, without knowing the details of the rounding, anything with (>254, 255, >236) would exhibit the same issue, surely?


It's possible he just dumbed down the explanation for his video but I'm still too scared to make it my wallpaper. :)

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  #2507963 19-Jun-2020 11:31
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Pretty much just a bug in android colour rendering

(Androids own rounding of colourspace values causes a "over maximum acceptable value")

It's exceedingly rare - because very few images have these extreme colours (only if they have been edited/tweaked) - & likely to occur only in 'artifacts' - so probably less than 0.000001% chance.

It will happen with 'any' image where this occurs.
(I could see malicious actors now specifically posting wallpapers with this error - to specifically brick people's phones 'just for fun'.....)
So we are likely to see an increase now.

The rendering error is 'compounded' when you set it as a wallpaper - because Androids 'default behavior' in this instance is to try rebooting to fix the problem (which it cant do - because it's a built-in design bug)

So the phone gets stuck in a endless bootloop.

Pretty sucky bug - but no different to many of Microsoft's BSOD's bootloops caused by bugs in their updates

They are fixing it in the next release of Android.
(& a patch likely be released for existing devices at some point)

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