Pi3 bluetooth audio stutters with Wifi enabled
Nobody has claimed this yet.
Assessment
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Newbie friendliness
- 25/100
- Issue type
- Bug
- Clarity
- Needs clarification
- Activity status
- Stale
- Tech stack
- c, linux, raspberry-pi
- Domain
- audio-video-rtc, networking, operating-systems
Research direction
No source files, tests, or entry points are named. Start by reproducing A2DP playback with WiFi enabled on a Pi 3, then compare PulseAudio buffer underruns and throughput with wlan0 disabled. Done means identifying the WiFi/Bluetooth interaction and documenting or implementing a confirmed kernel-level resolution.
Written by the indexing model from the issue text.
Description
Hello,
I'm testing with streaming music using a2dp over bluetooth on the Pi3. When Wifi is enabled, I get constant buffer underruns wit Pulseaudio (Blueman shows a downstream of around 34kB/s). As soon as I disable the Wifi interface (ifdown wlan0), the audio starts to play normally and the downstream is around 42kB/s (which is correct high quality stereo audio if I see http://soundexpert.org/news/-/blogs/bluetooth-audio-quality-a2dp).
Also tried making the buffer much larger, changing resampling type, realtime-scheduling etc. Also tried latest Pulseaudio, no difference. Seems like it is a Raspberry problem.
First thought it was because the Wifi and Bluetooth both use UART, but the is not true (and would be too slow if Wifi was over the 921600 baud if I see it correctly). They still share the same chip (BCM43438). Is there a known reason why I (and also heard others) have this problem?
- Dominant language
- C
- Stars
- 13.2k
- Forks
- 5.5k
- Avg merge
- 2d 21h
- Merged PRs (30d)
- 21
Contributor guide
No contributing guide indexed for this repository
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
More from raspberrypi/linux
-
Difficulty 2/5 1-3 hours Newbie friendliness 68/100
raspberrypi/linux#7415 · 2 comments · 1 reaction ·
-
rp1-cfe doesn't forward V4L2_EVENT_SOURCE_CHANGE event from csi-2 sensor driver to userspace app Open
Difficulty 2/5 1-3 hours Newbie friendliness 72/100
raspberrypi/linux#7399 · 1 comment ·
-
Difficulty 1/5 Under an hour Newbie friendliness 82/100
raspberrypi/linux#7357 · 1 comment ·
-
Difficulty 2/5 1-3 hours Newbie friendliness 68/100
raspberrypi/linux#7054 · 2 comments ·
-
Difficulty 4/5 3-5 days Newbie friendliness 48/100
raspberrypi/linux#7634 · 8 comments · 1 reaction ·
All issues in raspberrypi/linux
Similar issues
-
Difficulty 2/5 1-3 hours Newbie friendliness 88/100
zephyrproject-rtos/zephyr#119726 ·
-
[Bounty proposal] fix(web): memory insights count an evening memory on the next day ($25 proposed) Open
Difficulty 2/5 1-3 hours Newbie friendliness 84/100
BasedHardware/omi#15320 ·
-
[adam] AdamNet network read doesn't cap to MAX_ADAM_PACKET_LEN, overflows client receive buffers Open
Difficulty 2/5 1-3 hours Newbie friendliness 88/100
FujiNetWIFI/fujinet-firmware#1649 · 2 comments ·
-
Difficulty 2/5 1-3 hours Newbie friendliness 68/100
HarbourMasters/Shipwright#7229 ·
-
Difficulty 2/5 1-3 hours Newbie friendliness 72/100
riscv-software-src/riscv-isa-sim#2435 · 1 comment ·