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After updating to kernel linux-image-6.5.0-14-generic, IPv6 stopped working
with the MT7921 wifi card.
No errors are logged, but when using tcpdump / wireshark to capture traffic, I
can see the MT7921 card no longer appears to receive IPv6 Multicast (thus it
never receives the Router Advertisements, etc.).
Booting back to the previous kernel image (linux-image-6.2.0-39-generic)
resolves the issue and IPv6 Multicast works fine and IPv6 connectivity
works fine again.
The system is configured to use the 22.04 HWE kernel to better support
the AMD Advantage Platform hardware (ASUS ROG Strix G513QY).
Steps to reproduce:
1. Have Ubuntu 22.04 LTS installed on a laptop with MT7921 Wifi adapter and
connect it to a Dual-stack network leveraging Router Advertisements for IPv6.
2. Run it with HWE Kernel image linux-image-6.2.0-39-generic and observe the
following:
- IPv6 stateless autoconfiguration works and a public/global address is
assigned.
- Inbound IPv6 Multicast packets are seen when using tcpdump/wireshark.
3. Update the HWE Kernel to linux-image-6.5.0-14-generic and observe the
following:
- IPv6 only configures link-local address (fe80::) and no public/global address.
- No inbound IPv6 multicast packets are seen when using tcpdump/wireshark.
fludizz@pauwel:~$ lsb_release -rd
Description: Ubuntu 22.04.3 LTS
Release: 22.04
Network card in question:
05:00.0 Network controller: MEDIATEK Corp. MT7921 802.11ax PCI Express Wireless
Network Adapter
Subsystem: AzureWave Device 4680
Flags: bus master, fast devsel, latency 0, IRQ 83, IOMMU group 14
Memory at fc30300000 (64-bit, prefetchable) [size=1M]
Memory at fc30400000 (64-bit, prefetchable) [size=16K]
Memory at fc30404000 (64-bit, prefetchable) [size=4K]
Capabilities: [80] Express Endpoint, MSI 00
Capabilities: [e0] MSI: Enable+ Count=1/32 Maskable+ 64bit+
Capabilities: [f8] Power Management version 3
Capabilities: [100] Vendor Specific Information: ID=1556 Rev=1 Len=008
<?>
Capabilities: [108] Latency Tolerance Reporting
Capabilities: [110] L1 PM Substates
Capabilities: [200] Advanced Error Reporting
Kernel driver in use: mt7921e
Kernel modules: mt7921e
fludizz@pauwel:~$ apt-cache policy linux-image-6.5.0-14-generic
linux-image-6.5.0-14-generic:
Installed: 6.5.0-14.14~22.04.1
Candidate: 6.5.0-14.14~22.04.1
Version table:
*** 6.5.0-14.14~22.04.1 500
500 http://nl.archive.ubuntu.com/ubuntu jammy-updates/main amd64
Packages
500 http://security.ubuntu.com/ubuntu jammy-security/main amd64 Packages
100 /var/lib/dpkg/status
Note: The WiFi device is using the same firmware version on both
kernels.
** Affects: linux-signed-hwe-6.5 (Ubuntu)
Importance: Undecided
Status: New
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MT7921 - IPv6 no longer working (Not receiving Multicast)
https://bugs.launchpad.net/bugs/2049303
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