Root Cause Identified: Outdated Firmware The issue is confirmed to be caused by an outdated board-2.bin file in the current Ubuntu linux-firmware package. The kernel driver logic is correct; it was correctly filtering out channels because the old firmware reported incorrect capabilities.
The Fix: Updating the firmware manually to the latest upstream snapshot resolves the issue completely. Request for Ubuntu Maintainers: Please update the linux-firmware package (if not updated yet) to include the following upstream commit (or a newer snapshot): Upstream Repo: linux-firmware.git Commit: 1d588f106ceea113c4c650b43d948da5746e704c Date: Sep 18, 2025 Subject: ath12k: WCN7850 hw2.0: update board-2.bin -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2138754 Title: [ath12k wcn7850] 5 GHz Wi-Fi broken in kernel 6.17+ due to broken frequency range filtering To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2138754/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
