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https://bugs.launchpad.net/bugs/1810636
Title:
QCA6174 doesn't utlise btcoex - Ubuntu 18 Bluetooth Audio
Skip/Stutter/Delay WiFi bandwidth conflict Dell XPS 9570
Status in linux package in Ubuntu:
Incomplete
Bug description:
I'm running Linux 4.20.0-042000-generic #201812232030 x64 on a Dell
XPS 9570 with QCA6174 chipset, and have had the problem with Bluetooth
audio choppiness ever since I have owned this laptop. This problem has
persisted for me with previous kernels.
It started with Ubuntu 18.04 and continues with 18.10. I'm running .
It's particularly noticeable when the when saturating the WLAN
connection with throughput, i.e. copying a large file sequentially
across from a samba share, but also streaming video online results in
the audio progressively delaying over-time. Re-establishing the
Bluetooth audio sync restores the sync, but slowly creeps out again.
I've upgraded my linux-firmware package to disco 176 to match v4.20
kernel drivers ref: https://launchpad.net/ubuntu/+source/linux-
firmware/1.176
The ath10k_core driver that supports this device has a reference for
btcoex: ref
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/net/wireless/ath/ath10k/core.c?h=v4.20#n2598
It's possible that the Bluetooth component firmware is not supporting
or communicating btcoex compatibility, but this is starting to reach
the edge of my ability to diagnose the problem.
This btcoex support in ath9k has resolved/improved the Bluetooth
bandwidth problem as shown in
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1746164
As a troubleshooting step, I've also tried the very latest firmware-6
file from, but I'm continuing to experience the problem ref:
https://github.com/kvalo/ath10k-
firmware/tree/master/QCA6174/hw3.0/4.4.1
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