Intel bluetooth regression in 5.15.3

From: Chris Clayton
Date: Fri Nov 19 2021 - 08:43:38 EST


I built and installed 5.15.3 this morning and found that my bluetooth devices no longer work. 5.15.2 and 5.10.80 are
both OK.

I've bisected it and landed on:

cfc1a472a8d89c0d0bbb3600501eeeebc5ec8039 is the first bad commit
commit cfc1a472a8d89c0d0bbb3600501eeeebc5ec8039
Author: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Date: Sat Oct 9 16:22:09 2021 +0200

ACPI: scan: Release PM resources blocked by unused objects

[ Upstream commit c10383e8ddf4810b9a5c1595404c2724d925a0a6 ]

On some systems the ACPI namespace contains device objects that are
not used in certain configurations of the system. If they start off
in the D0 power state configuration, they will stay in it until the
system reboots, because of the lack of any mechanism possibly causing
their configuration to change. If that happens, they may prevent
some power resources from being turned off or generally they may
prevent the platform from getting into the deepest low-power states
thus causing some energy to be wasted.

Address this issue by changing the configuration of unused ACPI
device objects to the D3cold power state one after carrying out
the ACPI-based enumeration of devices.

Reported-by: Mario Limonciello <mario.limonciello@xxxxxxx>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Tested-by: Mario Limonciello <mario.limonciello@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

drivers/acpi/glue.c | 25 +++++++++++++++++++++++++
drivers/acpi/internal.h | 1 +
drivers/acpi/scan.c | 6 ++++++
3 files changed, 32 insertions(+)

5.15.3 with that commit reverted works fine.

Let me know if you need any additional diagnostics or patches tested but please cc me as I'm not subscribed.