I am trying to set the (inquiry) transmit power of Bluetooth dongles with both Broadcom and CSR chipsets using
hciconfig hci0 inqtpl 3
But whatever valid parameter I pass, reading the value afterwards always yields 0, like so:
hci0: Type: BR/EDR Bus: USB BD Address: 00:02:72:D6:6B:25 ACL MTU: 1021:8 SCO MTU: 64:1 Inquiry transmit power level: 0
When I pass invalid values, I get an error message:
Can't set inquiry transmit power level on hci0: Input/output error (5)
So obviously the parameter is checked for validity. I am pretty sure it's checked by the chipsets, as I get the same results when sending the appropriate HCI commands manually.
Both chipsets also state they support this feature:
# hciconfig hci0 features hci0: Type: BR/EDR Bus: USB BD Address: 00:02:72:D6:6B:25 ACL MTU: 1021:8 SCO MTU: 64:1 Features page 0: 0xbf 0xfe 0xcf 0xfe 0xdb 0xff 0x7b 0x87 [...] <err. data report> <non-flush flag> <LSTO> <inquiry TX power> [...]
Am I getting something wrong, or is it just by occasion that both chipsets I'm using do not support this feature?