Nokia N900, PostMarketOS and automatically turning off the screen

Oct 08, 2017 in #development #infosec

The Nokia N900[1] has to be my favorite handheld device of all time, even more so than the Nintendo Gameboy ;)

I recently discovered PostmarketOS[2], based on Alpine Linux[3] that intends to be a replacement phone OS with a 10 year lifespan. This also led me to discover that the N900 has mostly mainline Linux Kernel Support.

The one thing I wanted to happen was that the screen powers off when the keyboard slides closed. Which is done by editing /etc/acpi/ as such:

    adjust_keypad_bl 255    
    echo 0 > /sys/devices/platform/omapdrm.0/graphics/fb0/blank
    adjust_keypad_bl 0
    echo 1 > /sys/devices/platform/omapdrm.0/graphics/fb0/blank

This looks like it would also be the place to do things with the other hardware buttons on the device. More to come on this device!

[1] [2] [3]