I install the pi-bluetooth on ubuntu 19.10.1, after reboot, the
bluetooth works automatically.
So pi-bluetooth could hide this issue.
[ 24.924485] Bluetooth: BNEP socket layer initialized
ubuntu@ubuntu:~$ hcitool dev
Devices:
hci0 B8:27:EB:24:02:02
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Packages, which is subscribed to linux-raspi2 in Ubuntu.
https://bugs.launchpad.net/bugs/1862831
Title:
hciattach on rpi4 times out on first attempt
Status in linux-raspi2 package in Ubuntu:
New
Status in linux-raspi2 source package in Eoan:
New
Bug description:
I've observed this in both armhf and arm64 on:
19.10.1-server
18.04.4-server
core18
It does not seem to happen on rpi3, only on rpi4.
If you want to use Bluetooth on rpi, one must first run:
$ sudo hciattach /dev/ttyAMA0 bcm43xx 921600 noflow
On RPI4, this results in a timeout on the first attempt. Reattempting
it right after will work though, 100% of the times I've tried it.
In the failed attempt, the output is:
bcm43xx_init
Initialization timed out.
And the following is the only new message to show up in dmesg when this fails:
[ 270.303691] uart-pl011 fe201000.serial: no DMA platform data
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