From: bugzilla-daemon@bugzilla.kernel.org
To: linux-bluetooth@kernel.org
Subject: [Bug 199125] New: Suspending to mem hangs the machine without the BT driver loaded
Date: Thu, 15 Mar 2018 09:29:32 +0000 [thread overview]
Message-ID: <bug-199125-62941@https.bugzilla.kernel.org/> (raw)
https://bugzilla.kernel.org/show_bug.cgi?id=199125
Bug ID: 199125
Summary: Suspending to mem hangs the machine without the BT
driver loaded
Product: Drivers
Version: 2.5
Kernel Version: 4.16.0-rc5
Hardware: x86-64
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Bluetooth
Assignee: linux-bluetooth@vger.kernel.org
Reporter: imre.deak@intel.com
Regression: No
On an Intel GLK NUC machine suspending to memory (S3) hangs if the BT driver is
not enabled. Specifically the following kconfig options need to be enabled to
avoid the hang:
CONFIG_BT
CONFIG_BT_INTEL
CONFIG_BT_HCIBTUSB
An alternative is to disable the Bluetooth onboard device in BIOS.
The hang happens after execution transfers to BIOS code during suspend, after
the very last ACPI register write to entry S3 in
drivers/acpi/acpica/hwsleep.c:
after the following call in acpi_hw_legacy_sleep():
/* Write #2: Write both SLP_TYP + SLP_EN */
status = acpi_hw_write_pm1_control(pm1a_control, pm1b_control);
In general not loading the BT driver may be a useful thing to work-around
potential BT driver bugs, or during isolation of a bug without a known reason
(by unloading drivers one-by-one and seeing if the problem re-occurs).
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