Thank you for all the amazing work that you're doing.

The article says that no PWM has been detected in the device. I wonder whether you actually measured the led backlight for flicker? I've got the Palma and its yellow light tiggers a strong reaction (eye strain) as if it uses PWM for dimming. I saw other posts of users with a similar problem caused by the Palma's backlight (!).

I suspect Palma is using PWM to optimise battery usage for its backlight and it may be quite harsh. It's not something I noticed on Onyx Boox Note Air (I) which I also have.

Can you pls confirm you've actually measured the blue and yellow ranges of the device's backlight for PWM flicker? Thank you in advance.

Dear Notebookcheck,

Your test report shows that the minimum brightness is 0.2 cd/m².
Does it mean it's impossible to disable the frontlight COMPLETELY on Onyx Boox Palma (i.e. to set the brightness to 0 cd/m²)??

Thank you.

Michael Bradley

A test to check how long it lasts while reading books might have been nice. My 4+ years old Kindle Paperwhite 3 which is significantly less power efficient than the PW4/5 regularly lasts 60-70 hours with the backlight and Wifi disabled. With a - 3x capacity battery if the Onyx lasts as much it would be really good as Android and the much more demanding SoC exact a toll on battery life.