The_Handy_Andy
Posts: 37
Joined: Sun Jan 17, 2016 7:13 pm

Pi400 with 10.1" 2k screen running on powerbanks

Fri Apr 09, 2021 12:19 pm

My new Portable Raspberry Pi setup.
A Pi400.
A 10.1" 2k monitor.
2 10,000 mAh powerbanks!
The screen used a bit power than the Pi & I'd estimate that the power use for the Pi is about 8-10% an hour (just doing basic things).
At 2k resolution (2560*1600) the picture is so sharp but I did need to set the font size at 36!
At 1920*1080 the picture is still good but slightly squeezed.
The screen is an Elecrow SQ101.
The powerbanks have displays showing % left.
At this point the Pi imager is unusable (jumbled text over text).

Image

The above was a few days ago.

I now have a Screen update!
After a bit of experimentation with the 10.1" 2k screen I am using the following settings.
Appearance Settings:
Menu Bar - size large (32x32)
Defaults - medium screens
System - font 16
RPi Config:
Display - pixel doubling on

Image

The Pi imager is now usable!

Image

It should be noted that you need to apply the medium screens defaults BEFORE you set the font to 16 otherwise it goes back to 12 if you set it first.

Andrew

aBUGSworstnightmare
Posts: 3882
Joined: Tue Jun 30, 2015 1:35 pm

Re: Pi400 with 10.1" 2k screen running on powerbanks

Mon Apr 12, 2021 6:18 am

Hi, why not use your monitor on its native resolution and scale the image (in case you want to have bigger font size)?

Under KMS you can try the '--scale' option, below you can see the effect of this command. The pictures show the effect on a display which had a resolution of 1280x800. You can simply try the command at no risk!

Image
pi@raspberrypi:~ $ xrandr --output HDMI-1 --primary --scale 1.5x1.5

Image
pi@raspberrypi:~ $ xrandr --output HDMI-1 --primary --scale 0.5x0.5

Image
pi@raspberrypi:~ $ xrandr --output HDMI-1 --primary --scale 1x1

Be sure to test this on latest kernel with 'dtoverlay=vc4-kms-v3d' enabled in your config.txt (or optionally with FMKS enabled at least).

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