I'm getting this when I try to change the width to 160 Mhz with AX and auto channel.
That, by itself, doesn't mean anything, as it can only show a value if there are (at least one) clients attached to this particular AP interface/ channel. Also keep in mind that your hardware will take longer to do a DFS survey with 160 MHz channel bandwidth, while at the same time being much more fragile towards DFS events (much more likely to find a radar, if you double the covered bandwidth.
Two additional issues to keep in mind:
- the wireless hardware of your e8450 does not support 6 GHz at all, only 2.4 GHz and 5 GHz
- the wireless hardware of your e8450 is not specified to support 160 MHz channel bandwidth, only 80 MHz max. The OEM firmware (and the proprietary drivers) don't offer this mode at all. OpenWrt and mt76 do not prevent this from being configured, but it is known to be 'problematic', after all the hardware was never meant to support it and may actually not do so
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