** Changed in: linux (Ubuntu)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1692783
Title:
arm64: mbigen updates
Status in linux package in Ubuntu:
Fix Committed
Status in linux source package in Zesty:
In Progress
Bug description:
[Impact]
TLDR; required for compatibility with current release firmware.
The hwe-z kernel includes a pre-upstream version of ACPI/mbigen
support (LP: #1669061). Before going upstream, the ACPI binding used
by the driver was changed. The firmware for the HiSilicon D05 board
has been updated to be compatible with the upstream code, so Ubuntu
will need to follow suit to support this system going forward. The
upstream version also suffered from a few issues that have since been
fixed that could lead to probing failures, NULL dereferences and
failures with newer (non-debug) firmware.
[Test Case]
Boot the HiSilicon D05 board w/ the hwe-z kernel and current firmware (>=
spc-b011-v1). If it gets up to a prompt w/ no crashes you're good :)
[Regression Risk]
The only implementation of the mbigen device supported by Ubuntu's kernel is
the HiSilicon D05 board, which is still under active development. Obviously the
ACPI change may regress existing users, but that userbase is limited and
actively testing w/ newer firmware/OS updates until we reach a certified Ubuntu
LTS release.
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