From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: MIME-Version: 1.0 Date: Fri, 13 Nov 2009 19:47:43 +0100 Message-ID: Subject: Getting/setting Inquiry trasmit power level unsolved From: Natale Vinto To: linux-bluetooth@vger.kernel.org Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-bluetooth-owner@vger.kernel.org List-ID: Hi all, I've this issue: while trying to get/set inquiry transmit power level from a bluetooth usb dongle on 2.6 kernels I got always this error: Can't read inquiry transmit power level on hci0: Input/output error (5) I've tried with any bluetooth usb dongle class (1.1, 2 and 2.1) from many vendors (ex. Sitecom, Trust, D-Link, Belkin, etc), in many 2.6.x kernels ( 2.6.{27,31} ) on Debian and Ubuntu machines using BlueZ 3.x and 4.x stack and I got always that error while trying to get the TPL with: hciconfig inqtpl I searched a lot in mailing list archives and I haven't seen any solution for this issue, I've found maybe useful only this old email http://osdir.com/ml/bluez.devel/2003-06/msg00140.html where is suggested a CSR chipset based hardware. Also looking in sources I found that the problem comes from this pieces of code: int8_t level;         if (hci_read_inquiry_transmit_power_level(dd, &level, 1000) < 0) {             fprintf(stderr, "Can't read inquiry transmit power level on hci%d: %s (%d)\n",                         hdev, strerror(errno), errno);             exit(1);         } My question is : how can I have the inqtpl option working? Should I buy only CSR hardware dongle? I'm considering usb dongle because they are the most common in the market, although it could be a linux-usb issue I wonder how to try to fix it! I'm working as sys admin (part-time, do the evolution baby!) for embedded devices for a company that deal with proximity marketing using linux and they would be very pleased to make you a donation if you could suggest us a solution in order to have this issue fixed cause it would optimize inquiries so fine, this is a primary goal for the development team itself. Thank you Best Regards -- Natale Vinto http://www.hictech.com http://bluesman.gotext.org