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Scattercatt avatar Scattercatt commented on August 16, 2024

I have run into this issue as well. I'm writing my program in python, and it seems like instantiating the RGBMatrix object does something to screw up privileges. Whenever I comment out the line, the keyboard.read_key() runs fine with no error. If I have it not commented out, I get the error OP is getting.

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hzeller avatar hzeller commented on August 16, 2024

The privileges are dropped by default to not run as root afterwards.

rpi-rgb-led-matrix/include/led-matrix.h

Lines 422 to 426 in a3eea99

// Drop privileges from 'root' to drop_priv_user/group once the hardware is
// initialized.
// This is usually a good idea unless you need to stay on elevated privs.
// -1, 0, 1 similar meaning to 'daemon' above.
int drop_privileges; // -1 disabled. 0=off, 1=on. flag: --led-drop-privs

So you can change that by setting a different runtime option (there is an analog in the Python API).

Setting back the privileges should not really be a problem as you only need to be root in the beginning when you set up everything.

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Scattercatt avatar Scattercatt commented on August 16, 2024

Ah perfect thank you!

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