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@xxxxxxxxxxxxxxx Reporter: imre.deak@xxxxxxxxx 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). -- You are receiving this mail because: You are the assignee for the bug.-- To unsubscribe from this list: send the line "unsubscribe linux-bluetooth" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
