** Changed in: linux (Ubuntu)
Importance: Undecided => Medium
** Changed in: linux (Ubuntu)
Status: Confirmed => Triaged
** Also affects: linux (Ubuntu Disco)
Importance: Medium
Status: Triaged
** Tags added: disco
** Tags removed: disco
** Tags added: kernel-da-key
** Tags added: disco
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https://bugs.launchpad.net/bugs/1803206
Title:
Please enable CONFIG_DMA_CMA=y on arm64
Status in linux package in Ubuntu:
Triaged
Status in linux source package in Disco:
Triaged
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.
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