First of all you need to figure out which sensor this even is. On my nct6687, there’s a sensor on the PCIe slot that is constantly >90° and that appears to be totally normal.

Could you post the output of sensors?

Here is how it looks like on my machine:

nct6687-isa-0a20
Adapter: ISA adapter
+12V:           12.26 V  (min = +12.14 V, max = +12.46 V)
+5V:             5.06 V  (min =  +5.00 V, max =  +5.08 V)
+3.3V:           0.00 V  (min =  +0.00 V, max =  +3.40 V)
CPU Soc:         1.02 V  (min =  +1.02 V, max =  +1.04 V)
CPU Vcore:       1.27 V  (min =  +0.91 V, max =  +1.40 V)
CPU 1P8:         0.00 V  (min =  +0.00 V, max =  +0.00 V)
CPU VDDP:        0.00 V  (min =  +0.00 V, max =  +0.00 V)
DRAM:            1.11 V  (min =  +1.10 V, max =  +1.11 V)
Chipset:       202.00 mV (min =  +0.18 V, max =  +0.36 V)
CPU SA:          1.08 V  (min =  +0.61 V, max =  +1.14 V)
Voltage #2:      1.55 V  (min =  +1.53 V, max =  +1.57 V)
AVCC3:           3.39 V  (min =  +3.32 V, max =  +3.40 V)
AVSB:            0.00 V  (min =  +0.00 V, max =  +3.40 V)
VBat:            0.00 V  (min =  +0.00 V, max =  +2.04 V)
CPU Fan:        730 RPM  (min =  718 RPM, max = 1488 RPM)
Pump Fan:         0 RPM  (min =    0 RPM, max =    0 RPM)
System Fan #1:    0 RPM  (min =    0 RPM, max =    0 RPM)
System Fan #2:  490 RPM  (min =  421 RPM, max =  913 RPM)
System Fan #3:    0 RPM  (min =    0 RPM, max =    0 RPM)
System Fan #4:  472 RPM  (min =  458 RPM, max =  939 RPM)
System Fan #5:    0 RPM  (min =    0 RPM, max =    0 RPM)
System Fan #6:    0 RPM  (min =    0 RPM, max =    0 RPM)
CPU:            +37.0°C  (low  = +30.0°C, high = +90.0°C)
System:         +25.0°C  (low  = +22.0°C, high = +48.0°C)
VRM MOS:        +22.0°C  (low  = +20.5°C, high = +66.0°C)
PCH:            +21.5°C  (low  = +18.5°C, high = +49.0°C)
CPU Socket:     +21.0°C  (low  = +19.0°C, high = +56.5°C)
PCIe x1:        +92.0°C  (low  = +76.5°C, high = +97.0°C)
M2_1:            +0.0°C  (low  =  +0.0°C, high =  +0.0°C)

Note that I use the https://github.com/Fred78290/nct6687d/ kernel module though. The upstream one doesn’t label many temps.

the Kobo Libra 2 or Colour or the Kobo Sage (B&W) are solid options

Only the latter is available here sadly.

The main downside would be screen size, which is only 7” or 8” compared to your Sony’s 6” screen. Better, but probably not quite manga-sized.

8" is edging it really close, I’d have to test it somehow. Ideally it’d be 10" diagonally as that’d be about as large a manga page is IRL.

The only Kobo I’ve found available here that is 10" diagonal is the Kobo Elipsa E2. Is that one any good?

The hardest thing for me to judge is image quality; whether it’s any good at displaying greyscale images and whether there’s any residual artifacts when turning full-screen greyscale image pages.

If size is the most important factor, you’ll probably have to sacrifice ergonomics and physical buttons. I don’t know of a >8” screen that also has physical buttons.

I may have to backtrack on the buttons if it’s really that uncommon. I’d have expected most devices to have physical buttons because it just seems so obvious to me to have them.

If you do end up going down the Kobo path, I expect you’d be quite happy.

Do I need any account or accept any sort of human rights abuse consent formprivacy policy in order to use Kobo devices?

Vastly more consumer-friendly than Amazon.

That’s not a particularly high bar :D

Edit: re: enshittification: Kobo devices do have a native store, but between built-in library access, Dropbox support, and a web browser that I use to connect to a Calibre server, I don’t know if I’ve ever read a Kobo store book on either of my devices. They’re very easy to use how you want.

Yeah the greatest risk for me is that that can change overnight and history has shown that eventually greed will eventually win out unless explicitly mitigated against through effective means.

How would you rate the likelyhood to enshittify or otherwise turn into an adverse contract partner given your past experiences with Kobo/Rakuten?

Edit edit: since you mention FOSS, steer clear of the company called Onyx that makes devices branded as Boox. They have been wantonly violating GPL for years.

Thanks for the warning, will steer clear of those fuckers.

I’ve also heard of KOreader before which now I realise the KO might refer to Kobo?