Public bug reported:
It appears that on my laptop (see below for hardware specs), if the
system starts up with the Bluetooth LED turned off (the asus_laptop
kernel mode is configured not to "touch" the LED by default), the
Bluetooth adapter hardware is NOT detected at all. This, in turn, leads
to inability to turn on the adapter by regular means, as neither the
hardware rfkill switch, nor the Fn-F2 hotkey have any effect (they DO
however both work for the WiFi adapter).
If I manually turn the LED on by typing the following command in the terminal:
sudo sh -c "echo '1' > /sys/devices/platform/asus_laptop/bluetooth"
then the hardware gets detected, works as expected and CAN be controlled
by the rfkill interface.
According to the Wiki pages of the acpi4asus project, it _could_ be the
case that the sysfs file for the LED also controls the power state of
the adapter (which is being attributed to DSDT specifics). However, what
I would NOT expect is that setting the adapter's power state to "DOWN"
prevents the very detection of the adapter hardware - that is, I would
expect that if the BT adapter is turned off, I can still see it in the
hciconfig output, just marked as "DOWN".
I am pretty sure it is a kernel driver issue, as there are no such
problems on Windows 7 with proprietary Asus drivers running on the very
same laptop (no insult meant, just an attempt to do some differential
diagnosis).
OS Version:
Description: Ubuntu 11.04
Hardware:
Asus M51Sr Laptop
Custom module configuration:
/etc/modprobe.d/asus_laptop.conf:
options asus_laptop wapf=1 wlan_status=-1 bluetooth_status=-1
(tried different wapf values as per the acpi4asus "WAPF" Wiki page with no
effect)
NOTE: The following info can be obtained ONLY if I forcibly turn on the BT
adapter on by typing
sudo sh -c "echo '1' > /sys/devices/platform/asus_laptop/bluetooth"
in the terminal:
ubuntu@ubuntu:~$ lsusb
Bus 007 Device 003: ID 0b05:1712 ASUSTek Computer, Inc. BT-183 Bluetooth
2.0+EDR adapter
ubuntu@ubuntu:~$ hciconfig -a hci0
hci0: Type: BR/EDR Bus: USB
...
UP RUNNING
...
Features: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00
Packet type: DM1 DH1 HV1
Link policy:
Link mode: SLAVE ACCEPT
Name: 'ASUS BT183'
Class: 0x000000
Service Classes: Unspecified
Device Class: Miscellaneous,
HCI Version: 2.0 (0x3) Revision: 0x77b
LMP Version: 2.0 (0x3) Subversion: 0x77b
Manufacturer: Cambridge Silicon Radio (10)
** Affects: ubuntu
Importance: Undecided
Status: New
** Tags: acpi bluetooth laptop
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https://bugs.launchpad.net/bugs/782935
Title:
bluetooth adapter is not detected on Asus M51Sr if the asus-laptop
package is configured not to turn the Bluetooth LED on startup
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