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 [thread overview]
Message-ID: <bug-60824-62941-IrnVnUZtXA@https.bugzilla.kernel.org/> (raw)
In-Reply-To: <bug-60824-62941@https.bugzilla.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.
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[not found] <bug-60824-62941@https.bugzilla.kernel.org/>
2019-06-24 14:43 ` [Bug 60824] [PATCH][regression] Cambridge Silicon Radio, Ltd Bluetooth Dongle unusable bugzilla-daemon
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