On the flip side, I am able to use dtoverlay=vc4-kms-v3d,cma-256 to boot my 3B+ on the disco kernel, which appears to allow me to use hardware accelerated decoding on the RPI.
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1803206 Title: Please enable CONFIG_DMA_CMA=y on arm64 Status in linux package in Ubuntu: Fix Released Status in linux source package in Disco: Fix Released Bug description: Using the generic arm64 kernel on my raspberry pi 3 it seems impossible to use any apps that require 3D graphics. The X session crashes and a reboot is needed to make it bootable again. Inspecting dmesg, there are a lot of "failed to allocate CMA" messages. Adding cma=256M to the kernel command line has no effect. Dropping resolution allows firefox to start, but 3D apps still fail. I believe the vc4 driver needs CONFIG_DMA_CMA=y, which currently the generic kernel does not set. The raspi2 kernel has this and 3D graphics works. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1803206/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
