From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.0 required=3.0 tests=BAYES_00,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 25BC0C433E0 for ; Fri, 22 Jan 2021 13:26:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D939523433 for ; Fri, 22 Jan 2021 13:26:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727756AbhAVN0a convert rfc822-to-8bit (ORCPT ); Fri, 22 Jan 2021 08:26:30 -0500 Received: from mail.kernel.org ([198.145.29.99]:53132 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727022AbhAVN00 (ORCPT ); Fri, 22 Jan 2021 08:26:26 -0500 Received: by mail.kernel.org (Postfix) with ESMTPS id A2F8023A9A for ; Fri, 22 Jan 2021 13:25:45 +0000 (UTC) From: bugzilla-daemon@bugzilla.kernel.org To: linux-bluetooth@vger.kernel.org Subject: [Bug 60824] [PATCH][regression] Cambridge Silicon Radio, Ltd Bluetooth Dongle unusable Date: Fri, 22 Jan 2021 13:25:42 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Drivers X-Bugzilla-Component: Bluetooth X-Bugzilla-Version: 2.5 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: mirh@protonmail.ch X-Bugzilla-Status: REOPENED X-Bugzilla-Resolution: X-Bugzilla-Priority: P1 X-Bugzilla-Assigned-To: linux-bluetooth@vger.kernel.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: cc Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8BIT X-Bugzilla-URL: https://bugzilla.kernel.org/ Auto-Submitted: auto-generated MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-bluetooth@vger.kernel.org https://bugzilla.kernel.org/show_bug.cgi?id=60824 mirh (mirh@protonmail.ch) changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |mirh@protonmail.ch --- Comment #166 from mirh (mirh@protonmail.ch) --- So.. I hate to bring yet another variable (and probably yet another scenario) to the equation, but have people in here tried to also consider electrical interference? I had been using my fake CSR (lsusb is identical to comment 77, except bcdUSB=2.00 and MaxPower=0mA) for months on my old Core 2 Quad PC with WH-1000XM2. Arguably I was getting even a better run with A2DP and LDAC than windows itself, which is quite the achievement considering how infamous the linux wireless audio stack is. I changed to a more modern Z97 system, and lo and behold I was getting all kinds of crazy errors, disconnections, stuttering, failures to connect.. you name it. After bisecting all my software I eventually turned to the hardware, and see yourself: https://www.intel.com/content/dam/www/public/us/en/documents/white-papers/usb3-frequency-interference-papers.pdf Now, with an USB extension cord (or the USB 2.0 port on my laptop *very* far from all the others), I can get a rock solid signal.. at least up to the distance of literally a finger from the antenna inside the headphones. More than that, and anything goes. Sometimes I can listen to an entire album with a normal posture and position, others I have almost to touch the bluetooth receiver. A long cry from when I could even go to the bathroom meters, a wall, and a wooden door away (which is more or less what the AR3012 built-in in my laptop can still score instead). Something is rotten here electromagnetically but I cannot figure out anything more (reported RSSI in btmgmt looks indeed like shit). I tried to disable some of the usb power saving stuff, to no avail. And I wonder if the "hci0: unexpected event for opcode 0x0000" error that I'm only getting on the the first connect on the new Intel southbridges is in any way related. -- You may reply to this email to add a comment. You are receiving this mail because: You are the assignee for the bug.