Hello,

Same here:

MacBookPro12,1
BCM43602 [14e4:43ba], driver brcmfmac
Working kernel: 7.0.0-38-generic. Failing kernel: 7.3.0-9-generic 
Ubuntu 26.10 upgraded from 26.04 lts
The key dmesg symptoms: firmware loads (version 7.35.177.61), then:

ieee80211 phy0: brcmf_msgbuf_query_dcmd: Timeout on response for query command. 
ieee80211 phyO: brcmf_cfg80211_get_channel: chanspec failed (-5)

Tried (pcie_aspm=off, power cycle) but problem persists.

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https://bugs.launchpad.net/bugs/2169339

Title:
  [iMac18,2] BCM43602 Wi-Fi (brcmfmac) cannot associate on 7.3 kernels:
  DMAR DMA Read faults, firmware hangs; works with intel_iommu=off

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