Hi, On 17/12/20 at 09:24 +0900, Ryutaroh Matsumoto wrote: > (1) CONFIG_DRM_V3D has no effect, as > https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=977441#18 > > (3) /dev/dri/render* does not appear unlike > > https://bugs.launchpad.net/ubuntu/+source/linux-raspi/+bug/1880125/comments/14 > https://bugs.launchpad.net/ubuntu/+source/linux-raspi2/+bug/1850876/comments/33 > > GPU/DRM acceleration remains unusable on RPi4, and bug 968181 > https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=968181 > remains open. 968181 seems blocked by 977441.
That's expected. The needed V3D changes have not been done upstream (in the vanilla kernel). Ubuntu uses the Raspberry Pi foundation kernel, from github.com/raspberrypi/linux. That's why it works on Ubuntu. I documented how to build such as kernel on Debian on https://wiki.debian.org/RaspberryPi4#Building_a_custom_kernel_from_github.com.2Fraspberrypi.2Flinux_sources Lucas
