Libra eInk screen drastically slowing down when exposed to not-so-cold temps

NiMa · 08-22-2020, 01:26 AM

Hi,
I was wondering if this was normal : I got a Libra H2O working OK and all, but the thing is: the eInk screen drastically slows down when exposed not so cold-temperatures, e. g. 58-60 °F / 16 °C.
For example, when I refresh the screen when reading a book at room temp (71 °F / 22 °C, normally it takes about 1/8th of a second. At 59 °F / 15 °C, it takes one second or even more. If the temperature drops even below things don't improve.

So... should I return my Kobo and ask for a new one without this problem (hopefully) or is it normal for that type of screen?

Thanks!

NiLuJe · 08-22-2020, 08:20 AM

Cold = slower, warm = faster (until it gets so very much slower again ;D).

That said, I'd check if it's actually the *refresh* getting slower, or something else (CPU failing to clock up fast enough?).

It feels a bit too extreme, though, as I remember using a Forma at high altitude (so ~0°C, possibly below, which is technically out of specs ^^) with no extreme results.

You could check dmesg to see if the thermistor is borked or something, part of the usual dmesg spam is the battery & EPDC temp.

NiMa · 08-22-2020, 08:27 AM

Quote:

Originally Posted by NiLuJe

Cold = slower, warm = faster (until it gets so very much slower again ;D).

That said, I'd check if it's actually the *refresh* getting slower, or something else (CPU failing to clock up fast enough?).

It feels a bit too extreme, though, as I remember using a Forma at high altitude (so ~0°C, possibly below, which is technically out of specs ^^) with no extreme results.

You could check dmesg to see if the thermistor is borked or something, part of the usual dmesg spam is the battery & EPDC temp.

OK thanks for that I'll try it in a fridge or something like that!

Deskisamess · 08-22-2020, 08:36 AM

A fridge? Why?

NiMa · 08-22-2020, 08:43 AM

Quote:

Originally Posted by Deskisamess

A fridge? Why?

Well... to try the stuff from dmesg and all... or am I wrong? It's summer in my place right now and I discovered that when I went for camping to a colder region of my country.
So fridge is the only way to recreate that, I think (I know it's 4-5°C, I'll try not to leave it too much time so it doesn't get too cold)

geek1011 · 08-22-2020, 10:49 AM

Quote:

Originally Posted by NiMa

OK thanks for that I'll try it in a fridge or something like that!

I don't recommend doing that due to condensation.

Edit: Actually, you might be fine since you said you have an H2O.

NiLuJe · 08-22-2020, 10:56 AM

Also, battery chemistry probably doesn't like it all that much either (there's a reason the only two things spamming temp readings are the PMU and the EPDC ^^).

Quoth · 08-22-2020, 03:39 PM

At least down to 10°C has been fine on all my eink, inc Kindle PW3, Kindle DXG,Sony PRS350, original H2O and Libra.
We don't waste energy on heating, so we have little heat at night and house day time is 18 to 20 except in hot weather. Air con is virtually unknown here except in larger shops. I've used it outdoors at 10°C to 16°C.

It sounds like something is broken.

08-22-2020, 01:26 AM	#1
NiMa Fanatic Posts: 507 Karma: 2390534 Join Date: Jun 2020 Location: Somewhere in the Universe Device: Kobo Libra, Glo HD, Touch C/B, Mini, Glo, Aura SE, Clara HD, KT	eInk screen drastically slowing down when exposed to not-so-cold temps Hi, I was wondering if this was normal : I got a Libra H2O working OK and all, but the thing is: the eInk screen drastically slows down when exposed not so cold-temperatures, e. g. 58-60 °F / 16 °C. For example, when I refresh the screen when reading a book at room temp (71 °F / 22 °C, normally it takes about 1/8th of a second. At 59 °F / 15 °C, it takes one second or even more. If the temperature drops even below things don't improve. So... should I return my Kobo and ask for a new one without this problem (hopefully) or is it normal for that type of screen? Thanks!

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Library View Screen Drastically Reduced Font Size	RoverMaelstrom	Library Management	1	07-13-2020 10:42 PM
Brightness of Eink screen on PE	stevesr0	enTourage eDGe	2	07-16-2011 11:11 PM
Problem with my eink screen	cheyennedonna	enTourage Archive	11	03-28-2011 07:14 PM
Looking on opinions on the best eInk screen out there	roebeet	Which one should I buy?	17	10-29-2010 07:29 PM
iLiad Is the startup screen slowing the boot?	scotty1024	iRex Developer's Corner	4	12-14-2006 04:44 AM

08-22-2020, 08:20 AM	#2
NiLuJe BLAM! Posts: 13,506 Karma: 26047202 Join Date: Jun 2010 Location: Paris, France Device: Kindle 2i, 3g, 4, 5w, PW, PW2, PW5; Kobo H2O, Forma, Elipsa, Sage, C2E	Cold = slower, warm = faster (until it gets so very much slower again ;D). That said, I'd check if it's actually the refresh getting slower, or something else (CPU failing to clock up fast enough?). It feels a bit too extreme, though, as I remember using a Forma at high altitude (so ~0°C, possibly below, which is technically out of specs ^^) with no extreme results. You could check dmesg to see if the thermistor is borked or something, part of the usual dmesg spam is the battery & EPDC temp.

08-22-2020, 08:36 AM	#4
Deskisamess Wizard Posts: 2,752 Karma: 45301087 Join Date: Sep 2012 Location: Ohio Device: iPhone 13 Pro, iPad mini, iPad Pro 12.9",Paperwhite 6.8", Scribe 2022	A fridge? Why?

08-22-2020, 10:56 AM	#7
NiLuJe BLAM! Posts: 13,506 Karma: 26047202 Join Date: Jun 2010 Location: Paris, France Device: Kindle 2i, 3g, 4, 5w, PW, PW2, PW5; Kobo H2O, Forma, Elipsa, Sage, C2E	Also, battery chemistry probably doesn't like it all that much either (there's a reason the only two things spamming temp readings are the PMU and the EPDC ^^).

08-22-2020, 03:39 PM	#8
Quoth Still reading Posts: 13,937 Karma: 103895653 Join Date: Jun 2017 Location: Ireland Device: All 4 Kinds: epub eink, Kindle, android eink, NxtPaper	At least down to 10°C has been fine on all my eink, inc Kindle PW3, Kindle DXG,Sony PRS350, original H2O and Libra. We don't waste energy on heating, so we have little heat at night and house day time is 18 to 20 except in hot weather. Air con is virtually unknown here except in larger shops. I've used it outdoors at 10°C to 16°C. It sounds like something is broken.

Advert

Advert