** Changed in: linux-raspi2 (Ubuntu Eoan)
Assignee: (unassigned) => huihui (huihui321)
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-raspi2 in Ubuntu.
https://bugs.launchpad.net/bugs/1848790
Title:
USB not working under arm64 on Pi4
Status in linux-raspi2 package in Ubuntu:
Confirmed
Status in linux-raspi2 source package in Eoan:
Fix Released
Bug description:
Ubuntu 19.10 arm64 on a Raspberry Pi 4 does not recognize a keyboard
which works successfully on the same Raspberry Pi 4 with Ubuntu 19.10
armhf. Both USB hubs (2 and 3) were tested, without the OS seeing the
keyboard on either. Booting the arm64 image on a Raspberry Pi 3, the
keyboard worked successfully.
Output of lsusb under arm64 on a Pi 3:
ubuntu@ubuntu:~$ lsusb
Bus 001 Device 007: ID 413c:2106 Dell Computer Corp. Dell QuietKey Keyboard
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp. SMSC9512/9514
Fast Ethernet Adapter
Bus 001 Device 002: ID 0424:9514 Standard Microsystems Corp. SMC9514 Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Output of lsusb under armhf on a Pi 4 (same keyboard attached):
ubuntu@ubuntu:~$ lsusb
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 003: ID 413c:2106 Dell Computer Corp. Dell QuietKey Keyboard
Bus 001 Device 002: ID 2109:3431 VIA Labs, Inc. Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Output of lsusb under arm64 on the same Pi 4 (same keyboard attached):
ubuntu@ubuntu:~$ lsusb
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
The fact even the VIA Labs hub doesn't show up (which is built in)
suggests the kernel is (for some reason) unable to enumerate anything
against the USB hubs.
== Temporary Workaround ==
As noted by various people below, the following line can be added to
the "usercfg.txt" file on the boot partition:
total_mem=3072
This will limit the available RAM to 3Gb, but otherwise things should
operate normally. Note that this bug does not affect Pi 4Bs with less
than 4Gb of RAM.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux-raspi2/+bug/1848790/+subscriptions
--
Mailing list: https://launchpad.net/~kernel-packages
Post to : kernel-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~kernel-packages
More help : https://help.launchpad.net/ListHelp
