Quote Originally Posted by Blackttulip View Post
I know that's not the best resolution for my tablet,but,is there a way to change it?
You are confusing the method Phildu has indicated to you, and that of changing the dpi in the sys. With the Phildu method you can change the size of the keyboard only, while varying the dpi values in the sys you get the variations of the whole screen.
The result you got was by chance, and now I'll explain why.

With a setting: dpi ="auto", the dpi value of your device adapts to the nearest "standard" dpi value.

Your tablet has 170 as a PPI value and has adapted to the standard value of 240, (+70), instead of 160, (-110).
When you set 270, (+30), it actually remained at 240, when instead you set 290, (+50), it adapted to the value 320, (-30), but closer.

I'll show you the proof I made for another user in another forum.
I have a Huawei P20 Lite with 432 as PPI value, (PPI and dpi actually represent different things but for practical purposes we can say that they match), so in my case the phone adapts to the standard value of 480 dpi, (+48).

Spoiler: image
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As you can see I also set the dpi = 560, (+80 from the value 480 and -80 from the value 640), but it has adjusted to the value closest to the real one.
Then I set dpi = 640 and the screen is enlarged, then I set the dpi = 600, (-40 from the standard 640 but +120 from the standard 480), and the screen remained the same. I have also tried to set dpi = 800, but it does not work, beyond dpi = 640 results are not obtained.

From this test we can also see that small variations in the dpi value do not result in small screen variations.

I have not tried with base_dpi = ....... but I believe that it does not work ...... or as Arimi writes in his sys; base_dpi = ??? ; maybe needed only for iGO Avicsync.