Public bug reported:
[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.
** Affects: linux (Ubuntu)
Importance: High
Assignee: dann frazier (dannf)
Status: In Progress
** Affects: linux (Ubuntu Zesty)
Importance: High
Assignee: dann frazier (dannf)
Status: In Progress
** Also affects: linux (Ubuntu Zesty)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Zesty)
Status: New => In Progress
** Changed in: linux (Ubuntu Zesty)
Importance: Undecided => High
** Changed in: linux (Ubuntu Zesty)
Assignee: (unassigned) => dann frazier (dannf)
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https://bugs.launchpad.net/bugs/1692783
Title:
arm64: mbigen updates
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