Package: lightdm Version: 1.32.0-6+b1 Severity: normal On a number of systems with separate render-only gpu, for example everything with a Mali GPU, the graphics output will be the regular /dev/dri node, but for accelerated loads via mesa will render on the separate render-node - /dev/dri/renderD128 for example.
Installing and starting lightdm on such an ARM device with a Mali GPU using standard MESA will result in a black screen and a log like $ cat /var/log/lightdm/seat0-greeter.log [...] failed to open /dev/dri/renderD128: Permission denied glx: failed to create dri3 screen failed to load driver: rockchip Adding the lightdm-user to group render, solves this issue and allows lightdm to start.
