The first thing I'd suggest is to vary the tx_power and
rx_sensitivity parameters to the stir4200 kernel module.
Considering that the devices appear to be interoperable to
some extent, this really looks like a signal quality issue.
Also, you can try to vary the distance between the phone and
the dongle. About 6 inches to a foot is ideal -- closer
doesn't necessarily mean better signal quality. See if
either of these help.
After intalling the module, to try out these settings do:
insmod stir4200 rx_sensitivity=3 tx_power=2
rx_sensitivity, the seceiver sensitivity, varies from 0-7; 0
is most sensitive. tx_power, the transmitter power, varies
from 0-3, 0 is highest power.
The best settings depend on which physical transceiver is on your
particular str4100-based hardware. This is indeed why there is a
settable parameter. Unfortunately, there is no programmatic way
to detect what transceiver is attached. In fact, the only way
Windows gets this parameter correct is that the ".inf" in the
windows driver that was shipped with the dongle presumably had a
value correctly preset. Alas it's not in a form that I could
translate directly for you into sensitivity/power values.
Download Driver Pack
After your driver has been downloaded, follow these simple steps to install it.
Expand the archive file (if the download file is in zip or rar format).
If the expanded file has an .exe extension, double click it and follow the installation instructions.
Otherwise, open Device Manager by right-clicking the Start menu and selecting Device Manager.
Find the device and model you want to update in the device list.
Double-click on it to open the Properties dialog box.
From the Properties dialog box, select the Driver tab.
Click the Update Driver button, then follow the instructions.
Very important: You must reboot your system to ensure that any driver updates have taken effect.
For more help, visit our Driver Support section for step-by-step videos on how to install drivers for every file type.