Red Hat Bugzilla – Bug 468746
Bluetooth modem connection fails after suspend
Last modified: 2009-07-14 10:23:58 EDT
Description of problem:
I use a bluetooth phone as a modem. When I suspend and resume, I get the error "
Device Cingular: The serial port could not be locked." when trying to open a connection. I am also no longer able to browse the device via the bluetooth menu in my system tray.
Version-Release number of selected component (if applicable):
Fedora 9, updated as of 10/27/08
Suspend my thinkpad, resume, /sbin/ifup ppp0
Steps to Reproduce:
2. /sbin/ifup ppp0
Device Cingular: The serial port could not be locked.
Connection to the internet via cellphone modem
I noticed this problem after the wireless driver for my ath5k chipset was integrated into the kernel, they may be competing for the radio in some way. Also, rfcomm tells me that channel 8 is closed after the suspend. I'm using a Lenovo thinkpad x60s.
How do you create the rfcomm connection in the first place?
I'm not sure what level of detail you're after.
Aside from the actual device address, my rfcomm.conf file looks like
# # Automatically bind the device at startup
# bind no;
# # Bluetooth address of the device
# device 11:22:33:44:55:66;
device <my device address removed>
# # RFCOMM channel for the connection
# # Description of the connection
comment "LG CU400";
does that help?
Created attachment 328046 [details]
messages log when problem occurs
I have also this problem, I've attached the dmesg relative to the problem.
The log is relative to a boot, ppp 3g connection over an rfcomm bluetooth serial port, suspend, resume and then a reload of the bluetooth init script.
After reloading the bluetooth init script the rfcomm serial port starts to work again.
Here is my quick and dirty workaround to the problem:
Place in /etc/pm/sleep.d/bt-suspendfix.sh and make it executable (chmod +x).
case $1 in
echo "Unloading bt for suspend"
/usr/bin/rfcomm release /dev/rfcomm0
echo "Reloading bt after suspend"
/usr/bin/rfcomm bind /dev/rfcomm0
*) echo "somebody is calling me totally wrong."
There is obviously something wrong in the bluetooth stack kernel code for suspend handling.
(In reply to comment #3)
> There is obviously something wrong in the bluetooth stack kernel code for
> suspend handling.
There's nothing wrong in the Bluetooth kernel code. Your TCP connections will also die when they timeout due to your computer being suspended. Same thing here.
I don't believe the serial service in bluetoothd has that sort of problems.
Though those errors are kernel problems, and are most likely already fixed in newer kernels.
Dec 31 15:38:24 puffopc kernel: pm_op(): usb_dev_resume+0x0/0xa returns -19
Dec 31 15:38:24 puffopc kernel: PM: Device 3-1 failed to resume: error -19
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