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4

This happens because you have mount helpers which mount the storage devices with the identity of the user holding the current session on your machine. If you have a GUI and log in as pi, that's the user who will own the mounted devices. Changing permissions on /media/pi will not achieve anything as the mount helpers will either reset the permissions or ...


2

Here's the relevant part of the official docs. Min and max: GPU memory in megabytes, sets the memory split between the CPU and GPU; the CPU gets the remaining memory. The minimum value is 16; the technical maximum value 944 [for the RPi 4]. The default value is 64, values above 512 will not provide increased performance and should not be used. ...


1

You shouldn't need to set it beyond the default value in the plain Raspbian /boot/config.txt. Max value is 128M. Setting it beyond 128M can leave your Raspberry Pi 4B unbootable. GPU memory on a RPi4B isn't used in the same way as on earlier Raspberries.


1

I also use VLC on the latest Buster and RPi4. I remember getting some screen blinking when I used a crappy HDMI cable which I have since replaced. One easy test you can do is changing the screen resolution to a lower one, e.g. 1280x720. You can do this e.g. by editing /boot/config.txt, running raspi-config (those two require a reboot), by going to ...


1

Sometimes, Screen flickering is attributed due to low power supply. Please check at the top right of your screen you will see a yellow thunder icon if that is the case.


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