Public bug reported:
Hardware:
- Laptop: Dell Inspiron 15-3520
- Wi-Fi Adapter: Intel AX201 (CNVi)
- Driver: iwlwifi
- OS: Ubuntu Linux (latest stable)
Summary:
On Intel AX201 hardware, Linux does not support simultaneous Wi-Fi clients
(managed mode)
and access point (AP mode) operation when the client and AP require different
channels.
This works transparently on Windows on the same hardware.
Observed Behavior
- Only one channel can be active at a time.
- Simultaneous AP + Client works only if both are forced to the same channel.
- NetworkManager/iwlwifi does not perform automatic channel synchronisation.
Expected / Reference Behavior
- On Windows, the Intel AX201 driver supports simultaneous AP + Client operation
- on different channels via firmware-level channel timeslicing / virtualization.
- This behavior is not exposed on Linux.
Technical Details
iw list reports the following valid interface combinations:
#{ managed } <= 1
#{ AP, P2P-client, P2P-GO } <= 1
#channels <= 1
This effectively prevents Multi-Channel Concurrency (MCC) on Linux.
It appears that:
- iwlwifi firmware provided for Linux does not expose MCC
- mac80211 enforces single-channel constraints
- Windows drivers use proprietary firmware functionality
I would like to work on this issue by myself. I have been trying to find
the appropriate place to raise it, and while searching on GitHub, I was
unable to determine where to submit it. In the end, I decided to post it
here.
** Affects: network-manager (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/2137120
Title:
Intel AX201 (iwlwifi): No support for simultaneous AP + Client on
different channels (MCC) on Linux
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