This bug was fixed in the package linux - 5.0.0-7.8
---------------
linux (5.0.0-7.8) disco; urgency=medium
* linux: 5.0.0-7.8 -proposed tracker (LP: #1818519)
* Packaging resync (LP: #1786013)
- [Packaging] update helper scripts
* unnecessary request_queue freeze (LP: #1815733)
- block: avoid setting nr_requests to current value
- block: avoid setting none scheduler if it's already none
* Miscellaneous Ubuntu changes
- SAUCE: selftests: net: Don't fail test_vxlan_under_vrf on xfail
- update dkms package versions
[ Upstream Kernel Changes ]
* Rebase to v5.0
-- Seth Forshee <seth.fors...@canonical.com> Mon, 04 Mar 2019 08:46:10
-0600
** Changed in: linux (Ubuntu Disco)
Status: Fix Committed => Fix Released
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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:
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.
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