I've got a bit confused about the behavior of the system so I restarted
the process to check what's happening. Here the steps I performed:
1. Install clean image on SD card.
2. Block internet access of the RPI, so no updates to be installed on first
boot.
3. Reboot
4. Remove 50-cloud-init.yaml from /etc/netplan
5. Create eth0-dhcp.yaml in /etc/netplan with the following content:
network:
version: 2
ethernets:
eth0:
dhcp4: true
dhcp6: false
optional: true
6. Create wlan0-dhcp.yaml in /etc/netplan with the following content:
network:
version: 2
wifis:
wlan0:
optional: true
access-points:
"SSID":
password: "PASS"
dhcp4: true
dhcp6: false
7. Execute "netplan try" and "netplan apply"
8. Reboot
9. At that point the kernel is "linux-image-5.3.0-1007-raspi2" and both
adapters are connected, have their IPs and SSH is possible to both.
10. Remove ethernet cable from RPI.
11. SSH over wlan0 IP is possible.
12. Reboot
13. Check SSH over wlan0 IP - still possible.
14. Unblock internet access of the RPI and run "sudo apt-get update"
15. Install newest kernel "linux-image-5.3.0-1012-raspi2": sudo apt install
linux-image-5.3.0-1012-raspi2
16. Reboot
17. SSH over wlan0 IP - NOT possible (connection time out)
18. Connect ethernet cable.
19. Check again SSH over wlan0 IP - NOT possible (connection time out)
20. Check SSH over eth0 IP - connection possible, but after 5-10 minutes of
waiting.
21. Install net tools: "sudo apt install net-tools"
22. ifconfig show that only eth0 is connected. wlan0 is up, but don't have IP.
23. Reboot
24. SSH possible over eth0 and wlan0. ifconfig confirm that both adapters have
their IPs.
25. Remove ethernet cable from RPI.
26. SSH not possible to wlan0.
27. Connect ethernet cable - SSH still not possible to either eth0, nor wlan0.
28. Hard reset of the RPI to reboot it - remove power supply.
29. SSH over eth0 possible. ifconfig show that wlan0 is up, but don't have IP.
I performed the same steps with "linux-image-5.3.0-1013-raspi2" and the results
are the same.
As a summaryI would say that "linux-image-5.3.0-1007-raspi2" have no
issues with plug-in, pulg-out of the ethernet cable. wlan0 and eth0
seem to work independently and together without issues.
With kernels above the before mentioned, plug-in/pulg-out of the
ethernet cable disrupt wlan0 and without the cable, SSH (or ping) is not
possible to wlan0.
Tried to revert the kernel to 1007 (on another clean image) as you
suggested, but after reboot I no longer can establish SSH to RPI. And as
I'm running headless, I don't know if the RPI actually booted or it's a
connection issue.
--
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/1853030
Title:
No connection through SSH over WIfi after kernel update
Status in linux-raspi2 package in Ubuntu:
Incomplete
Bug description:
After updating from kernel "linux-image-5.3.0-1007-raspi2" to "linux-
image-5.3.0-1012-raspi2" I no longer can establish SSH connection to
Raspberry over Wifi.
When it is on wired connection, SSH works and initial screen shows
that both adapters (eth0 and wlan0) are connected and have their IPs.
"ifconfig" confirms that both adapters are up and have their IPs.
Establishing SSH session with both IPs is successful.
When I disconnect the network cable, SSH is no longer possible
(connection time out). In the same time the router is showing that the
Raspberry is connected to the Wifi network.
Plugging back the wire does not make the SSH possible. A restart of
the Raspberry is required with plugged in network cable in order to
establish SSH again.
The system is Raspberry Pi 4, 4GB with Ubuntu server X64 image - clean
install.
Wifi was enabled by editing /etc/netplan/50-cloud-init.yaml and
running "sudo netplan apply"
Reference info for what is done so far:
https://answers.launchpad.net/ubuntu/+question/685941
Output of "ubuntu-bug linux":
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu8.2
Architecture: arm64
Date: Mon Nov 18 16:46:39 2019
Dependencies:
adduser 3.118ubuntu1
apt 1.9.4
apt-utils 1.9.4
binutils 2.33-2ubuntu1
binutils-aarch64-linux-gnu 2.33-2ubuntu1
binutils-common 2.33-2ubuntu1
busybox-initramfs 1:1.30.1-4ubuntu4
ca-certificates 20190110
coreutils 8.30-3ubuntu2
cpio 2.12+dfsg-9ubuntu0.1
debconf 1.5.73
debconf-i18n 1.5.73
device-tree-compiler 1.4.7-3ubuntu2
devio 1.2-1.2
dpkg 1.19.7ubuntu2
e2fsprogs 1.45.3-4ubuntu2
fdisk 2.34-0.1ubuntu2
flash-kernel 3.98ubuntu5.1
gcc-9-base 9.2.1-9ubuntu2
gpgv 2.2.12-1ubuntu3
initramfs-tools 0.133ubuntu10
initramfs-tools-bin 0.133ubuntu10
initramfs-tools-core 0.133ubuntu10
klibc-utils 2.0.6-1ubuntu3
kmod 26-1ubuntu1
libacl1 2.2.53-4
libapt-pkg5.90 1.9.4
libattr1 1:2.4.48-4
libaudit-common 1:2.8.5-2ubuntu1
libaudit1 1:2.8.5-2ubuntu1
libbinutils 2.33-2ubuntu1
libblkid1 2.34-0.1ubuntu2
libbz2-1.0 1.0.6-9.2
libc6 2.30-0ubuntu2
libcap-ng0 0.7.9-2
libcom-err2 1.45.3-4ubuntu2
libdb5.3 5.3.28+dfsg1-0.6ubuntu1
libext2fs2 1.45.3-4ubuntu2
libfdisk1 2.34-0.1ubuntu2
libffi6 3.2.1-9
libgcc1 1:9.2.1-9ubuntu2
libgcrypt20 1.8.4-5ubuntu2
libgmp10 2:6.1.2+dfsg-4
libgnutls30 3.6.9-5ubuntu1
libgpg-error0 1.36-7
libgpm2 1.20.7-5
libhogweed4 3.4.1-1
libidn2-0 2.2.0-2
libklibc 2.0.6-1ubuntu3
libkmod2 26-1ubuntu1
liblocale-gettext-perl 1.07-3build3
liblz4-1 1.9.1-1
liblzma5 5.2.4-1
liblzo2-2 2.10-0.1
libmount1 2.34-0.1ubuntu2
libncursesw6 6.1+20190803-1ubuntu1
libnettle6 3.4.1-1
libp11-kit0 0.23.17-2
libpam-modules 1.3.1-5ubuntu1
libpam-modules-bin 1.3.1-5ubuntu1
libpam-runtime 1.3.1-5ubuntu1
libpam0g 1.3.1-5ubuntu1
libpcre2-8-0 10.32-5
libseccomp2 2.4.1-0ubuntu0.19.10.3
libselinux1 2.9-2
libsemanage-common 2.9-3
libsemanage1 2.9-3
libsepol1 2.9-2
libsmartcols1 2.34-0.1ubuntu2
libss2 1.45.3-4ubuntu2
libssl1.1 1.1.1c-1ubuntu4
libstdc++6 9.2.1-9ubuntu2
libsystemd0 242-7ubuntu3
libtasn1-6 4.14-3
libtext-charwidth-perl 0.04-9
libtext-iconv-perl 1.7-6
libtext-wrapi18n-perl 0.06-9
libtinfo6 6.1+20190803-1ubuntu1
libudev1 242-7ubuntu3
libunistring2 0.9.10-2
libuuid1 2.34-0.1ubuntu2
libzstd1 1.4.3+dfsg-1
linux-base 4.5ubuntu2
linux-modules-5.3.0-1012-raspi2 5.3.0-1012.14
login 1:4.5-1.1ubuntu4
logsave 1.45.3-4ubuntu2
lsb-base 11.0.1ubuntu1
lz4 1.9.1-1
mtd-utils 1:2.0.1-1ubuntu3
openssl 1.1.1c-1ubuntu4
passwd 1:4.5-1.1ubuntu4
perl-base 5.28.1-6build1
sensible-utils 0.0.12
tar 1.30+dfsg-6
u-boot-tools 2019.07+dfsg-1ubuntu3
ubuntu-keyring 2018.09.18.1
ucf 3.0038+nmu1
udev 242-7ubuntu3
util-linux 2.34-0.1ubuntu2
uuid-runtime 2.34-0.1ubuntu2
zlib1g 1:1.2.11.dfsg-1ubuntu3
DistroRelease: Ubuntu 19.10
Package: linux-image-5.3.0-1012-raspi2 5.3.0-1012.14
PackageArchitecture: arm64
ProcCpuinfoMinimal:
processor : 3
BogoMIPS : 108.00
Features : fp asimd evtstrm crc32 cpuid
CPU implementer : 0x41
CPU architecture: 8
CPU variant : 0x0
CPU part : 0xd08
CPU revision : 3
Hardware : BCM2835
Revision : c03111
Serial : 10000000352e9f36
Model : Raspberry Pi 4 Model B Rev 1.1
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
XDG_RUNTIME_DIR=<set>
LANG=C.UTF-8
SHELL=/bin/bash
ProcVersionSignature: Ubuntu 5.3.0-1012.14-raspi2 5.3.7
SourcePackage: linux-raspi2
Tags: eoan uec-images
Uname: Linux 5.3.0-1012-raspi2 aarch64
UpgradeStatus: No upgrade log present (probably fresh install)
_MarkForUpload: True
---
ProblemType: Bug
AlsaDevices:
total 0
crw-rw---- 1 root audio 116, 1 Apr 11 2019 seq
crw-rw---- 1 root audio 116, 33 Apr 11 2019 timer
AlsaVersion: Advanced Linux Sound Architecture Driver Version
k5.3.0-1012-raspi2.
AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay'
ApportVersion: 2.20.11-0ubuntu8.2
Architecture: arm64
ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord':
'arecord'
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq',
'/dev/snd/timer'] failed with exit code 1:
CRDA: N/A
DistroRelease: Ubuntu 19.10
Package: linux (not installed)
PciMultimedia:
ProcEnviron:
TERM=xterm
PATH=(custom, no user)
LANG=C.UTF-8
SHELL=/bin/bash
ProcFB:
ProcKernelCmdLine: coherent_pool=1M 8250.nr_uarts=1 cma=64M cma=256M
smsc95xx.macaddr=DC:A6:32:1C:19:7B vc_mem.mem_base=0x3ec00000
vc_mem.mem_size=0x40000000 net.ifnames=0 dwc_otg.lpm_enable=0
console=ttyS0,115200 console=tty1 root=LABEL=writable rootfstype=ext4
elevator=deadline rootwait
ProcVersionSignature: Ubuntu 5.3.0-1012.14-raspi2 5.3.7
RelatedPackageVersions:
linux-restricted-modules-5.3.0-1012-raspi2 N/A
linux-backports-modules-5.3.0-1012-raspi2 N/A
linux-firmware 1.183.2
RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill'
StagingDrivers: vc_sm_cma bcm2835_v4l2 bcm2835_mmal_vchiq
Tags: eoan uec-images staging
Uname: Linux 5.3.0-1012-raspi2 aarch64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:
_MarkForUpload: True
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https://bugs.launchpad.net/ubuntu/+source/linux-raspi2/+bug/1853030/+subscriptions
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