Although this issue is widely discussed, but I didn't find a way to solve it.
My access point provides both 2.4 GHz and 5 GHz bands, and I'd like my WiFi
adapter chose 5 GHz over 2.4.
To accomplish this, I reduced the AP's TX power for 2.4 GHz, and increased
that for 5 GHz. The point is that when the 2.4 GHz signal is higher than 5
GHz, my WiFi adapter prefers the 2.4 channel, even though usually the 5 GHz
channel is less crowded and has less interference and therefore its
performance would likely be better.
Another way would be to configure two separate SSIDs, one for 2.4 GHz, the
other for 5 GHz. However, neither option is viable when I have no control on
the APs, like in a university wireless campus.
Is there some tweak I can do on the kernel module, so that the choice doesn't
rely on any specific configuration on the AP?
My laptop features a Broadcom BCM43602 802.11ac WiFi adapter, supported by the
brcmfmac driver:
$ sudo lspci -vnn |grep BCM43602 -A17
03:00.0 Network controller [0280]: Broadcom Limited BCM43602 802.11ac Wireless
LAN SoC [14e4:43ba] (rev 01)
Subsystem: Apple Inc. BCM43602 802.11ac Wireless LAN SoC [106b:0133]
Flags: bus master, fast devsel, latency 0, IRQ 55
Memory at c1400000 (64-bit, non-prefetchable) [size=32K]
Memory at c1000000 (64-bit, non-prefetchable) [size=4M]
Capabilities: [48] Power Management version 3
Capabilities: [58] MSI: Enable+ Count=1/16 Maskable- 64bit+
Capabilities: [68] Vendor Specific Information: Len=44 <?>
Capabilities: [ac] Express Endpoint, MSI 00
Capabilities: [100] Advanced Error Reporting
Capabilities: [13c] Device Serial Number 0f-bd-a7-ff-ff-9d-98-01
Capabilities: [150] Power Budgeting <?>
Capabilities: [160] Virtual Channel
Capabilities: [1b0] Latency Tolerance Reporting
Capabilities: [220] #15
Capabilities: [240] L1 PM Substates
Kernel driver in use: brcmfmac
Kernel modules: brcmfmac
I found this patch that seems relevant:
brcmfmac: Give priority to 5GHz band in selecting target BSS
https://patchwork.kernel.org/patch/4156831/
but it seems it wasn't ever applied.
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