*** This bug is a duplicate of bug 1848790 *** https://bugs.launchpad.net/bugs/1848790
I have a PI 4 (4GB) I loaded and installed the arm64 eoan USB didn't work, ssh did I set total_mem=1024 USB worked I set total_mem=3072 USB failed I set total_mem=1024 and loaded the linux image: wget https://people.canonical.com/~hwang4/rpiv2/arm64/linux-image-5.3.0-1008-raspi2_5.3.0-1008.9+newupdate_arm64.deb wget https://people.canonical.com/~hwang4/rpiv2/arm64/linux-modules-5.3.0-1008-raspi2_5.3.0-1008.9+newupdate_arm64.deb sudo dpkg -i linux-modules-5.3.0-1008-raspi2_5.3.0-1008.9+newupdate_arm64.deb sudo dpkg -i linux-image-5.3.0-1008-raspi2_5.3.0-1008.9+newupdate_arm64.deb sudo reboot USB Worked I commented out the total_mem=3072 USB failed I believe the following will help: In the raspberry pi git (4.19.y) https://github.com/raspberrypi/linux/issues/3093 hitmoon commented on 12 Aug "I've created a trivial patch to add bounce buffers on ARM64 for pcie-bcrmstb. pcie-brcmstb-bounce64.patch.zip I tried this patch, it works for me! All 4G memory is alive now, COOL !! :-) Thanks @yaroslavros ! This fixed my linux image for my home rolled 19.04 ubuntu so I hope it fixes yours -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1848703 Title: Raspberry Pi 4 - USB Bus not detecting any devices To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-raspi2/+bug/1848703/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs