On Fri, 17 Jul 2020 at 17:15, Ed Greshko <ed.gres...@greshko.com> wrote:
> On 2020-07-18 03:59, Paul Smith wrote: > > On Fri, Jul 17, 2020 at 7:14 PM Samuel Sieb <sam...@sieb.net> wrote: > >>> I would like to buy a cheap Bluetooth receiver/transmitter for my > >>> desktop computer running Fedora 32. I have searched eBay for that, but > >>> meanwhile learned that most of them do not work on Linux. So, could > >>> you please advise me on that? > >> Where did you see that most don't work? I think it's the opposite. As > >> far as I know, they all work. It's USB wifi devices that you're more > >> likely to have trouble with (at least 5GHz ones). I recently needed a > >> bluetooth dongle for BLE and picked one of the cheaper ones I could find > >> and it just worked. > > Thanks, Samuel and George. I found issues of compatibility with Linux at: > > > > https://www.thetechlounge.com/best-bluetooth-adapter/ > > > > Meanwhile, I bought the following Bluetooth dongle, which was very > > cheap and therefore the risk is low: > > > > https://www.ebay.com/itm/143581114516 > > Well, I was like Samuel and thought that all BT dongles work fine under > Linux. > > However, I just bought one to replace a failed device. It is a newer > model which is > marked CSR 5 in support of BT version 5. It fails to be recognized by > bluez as adapter. > CSR <https://en.wikipedia.org/wiki/CSR_(company)> was formerly Cambridge Silicon Radio, now owned by Qualcomm and qualified under the name "Qualcomm Technologies International, Ltd. (QTIL)". It may not be easy to see technical documentation: Qualcomm Technologies International, Ltd. Confidential and Proprietary - Qualcomm Technologies International, Ltd. (formerly known as Cambridge Silicon Radio Ltd.) NO PUBLIC DISCLOSURE PERMITTED: Please report postings of this document on public servers or websites to: docctrlag...@qualcomm.com. Restricted Distribution: Not to be distributed to anyone who is not an employee of either ... Did the packaging have the bluetooth logo <https://www.bluetooth.com/develop-with-bluetooth/marketing-branding/>? To get the logo your device has to pass the Bluetooth Qualification Process. Can you find your device <https://launchstudio.bluetooth.com/Listings/Search>? I did find https://launchstudio.bluetooth.com/ListingDetails/48853. > > btmon shows... > > > HCI Event: Command Complete (0x0e) plen 6 #62 [hci0] > 12.841706 > Delete Stored Link Key (0x03|0x0012) ncmd 1 > Status: Unsupported Feature or Parameter Value (0x11) > Num keys: 0 BT has lots of features, you may be able to configure around this or your device may need "quirks" support in a driver. > > So, I would stay away from Version 5 products for the time being. > > Side note: The bluez maintainers didn't respond to my query about support > for this adapter. :-( > >From a youtube comment: "I bought some generic CSR V5, and my PC detected them, but they would not connect to any devices. All 5 of them don't work." Some cheap USB rf devices were designed to be bundled with a particular external device (keyboard, mouse, headphone, etc) and lack capabilities expected from a general purpose device. I expect the maintainers have enough work just keeping up with requests from manufacturers. One way to get their attention is to send them a couple devices, but I doubt they are interested in devices that weren't qualified. Try a USB 2 port -- some bt5 dongles don't work with USB 3 ports (not surprising, due to the RF interference problems of USB 3). -- George N. White III
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