While I can't replicate the actual suspend problem on my X201 running
current Natty, I confirm that the pm-utils hook doesn't immediately
release the module, as writing to the file in /proc is not synchronous.
Adding some debugging output to the hook reveals:
=== before ===-
--- /proc/acpi/ibm/bluetooth ----
status: enabled
commands: enable, disable
--- rfkill ---
0: tpacpi_bluetooth_sw: Bluetooth
Soft blocked: no
Hard blocked: no
1: tpacpi_wwan_sw: Wireless WAN
Soft blocked: no
Hard blocked: no
2: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
10: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
--- lsmod ---
btusb 18600 2
=== after ===-
--- /proc/acpi/ibm/bluetooth ----
status: disabled
commands: enable, disable
--- rfkill ---
0: tpacpi_bluetooth_sw: Bluetooth
Soft blocked: yes
Hard blocked: no
1: tpacpi_wwan_sw: Wireless WAN
Soft blocked: no
Hard blocked: no
2: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
10: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
--- lsmod ---
btusb 18600 2
=== after 0.5 s ===-
--- /proc/acpi/ibm/bluetooth ----
status: disabled
commands: enable, disable
--- rfkill ---
0: tpacpi_bluetooth_sw: Bluetooth
Soft blocked: yes
Hard blocked: no
1: tpacpi_wwan_sw: Wireless WAN
Soft blocked: no
Hard blocked: no
2: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
--- lsmod ---
btusb 18600 0
I. e. merely sleeping for 0.5 seconds after writing the proc file helps.
I'll write a better hook which waits for the module to get unused.
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https://bugs.launchpad.net/bugs/698331
Title:
thinkpad T410: Bluetooth not getting disabled on suspend
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