I have the same problem with wi-fi in openwrt on dap-1620 b1. I flashed back stock d-link firmware. Wi-fi works fine both in 5 ghz and 2.4 ghz.
I have exactly the same model and problem. D-Link DAP-1620 B1, worked perfectly with stock firmware. After flashing OpenWRT 24, only 1 radio can be seen. Hope it can be solved in the next version.
Please attach the output of dmesg and hexdump -C /dev/mtd2 here.
Thanks. The outputs are below.
dmesg
[ 0.000000] Linux version 6.6.73 (builder@buildhost) (mipsel-openwrt-linux-musl-gcc (OpenWrt GCC 13.3.0 r28427-6df0e3d02a) 13.3.0, GNU ld (GNU Binutils) 2.42) #0 SMP Mon Feb 3 23:09:37 2025
[ 0.000000] SoC Type: MediaTek MT7621 ver:1 eco:3
[ 0.000000] printk: bootconsole [early0] enabled
[ 0.000000] CPU0 revision is: 0001992f (MIPS 1004Kc)
[ 0.000000] MIPS: machine is D-Link DAP-1620 B1
[ 0.000000] Initrd not found or empty - disabling initrd
[ 0.000000] VPE topology {2,2} total 4
[ 0.000000] Primary instruction cache 32kB, VIPT, 4-way, linesize 32 bytes.
[ 0.000000] Primary data cache 32kB, 4-way, PIPT, no aliases, linesize 32 bytes
[ 0.000000] MIPS secondary cache 256kB, 8-way, linesize 32 bytes.
[ 0.000000] Zone ranges:
[ 0.000000] Normal [mem 0x0000000000000000-0x0000000007ffffff]
[ 0.000000] Movable zone start for each node
[ 0.000000] Early memory node ranges
[ 0.000000] node 0: [mem 0x0000000000000000-0x0000000007ffffff]
[ 0.000000] Initmem setup node 0 [mem 0x0000000000000000-0x0000000007ffffff]
[ 0.000000] percpu: Embedded 12 pages/cpu s19136 r8192 d21824 u49152
[ 0.000000] pcpu-alloc: s19136 r8192 d21824 u49152 alloc=12*4096
[ 0.000000] pcpu-alloc: [0] 0 [0] 1 [0] 2 [0] 3
[ 0.000000] Kernel command line: console=ttyS0,57600 rootfstype=squashfs,jffs2
[ 0.000000] Dentry cache hash table entries: 16384 (order: 4, 65536 bytes, linear)
[ 0.000000] Inode-cache hash table entries: 8192 (order: 3, 32768 bytes, linear)
[ 0.000000] Writing ErrCtl register=00068000
[ 0.000000] Readback ErrCtl register=00068000
[ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 32480
[ 0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off
[ 0.000000] Memory: 117996K/131072K available (8363K kernel code, 653K rwdata, 1016K rodata, 1284K init, 229K bss, 13076K reserved, 0K cma-reserved)
[ 0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
[ 0.000000] rcu: Hierarchical RCU implementation.
[ 0.000000] Tracing variant of Tasks RCU enabled.
[ 0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 10 jiffies.
[ 0.000000] NR_IRQS: 256
[ 0.000000] rcu: srcu_init: Setting srcu_struct sizes based on contention.
[ 0.000000] clocksource: GIC: mask: 0xffffffffffffffff max_cycles: 0xcaf478abb4, max_idle_ns: 440795247997 ns
[ 0.000004] sched_clock: 64 bits at 880MHz, resolution 1ns, wraps every 4398046511103ns
[ 0.016056] Calibrating delay loop... 586.13 BogoMIPS (lpj=2930688)
[ 0.088327] pid_max: default: 32768 minimum: 301
[ 0.106329] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
[ 0.120749] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
[ 0.145035] RCU Tasks Trace: Setting shift to 2 and lim to 1 rcu_task_cb_adjust=1 rcu_task_cpu_ids=4.
[ 0.163948] rcu: Hierarchical SRCU implementation.
[ 0.173367] rcu: Max phase no-delay instances is 1000.
[ 0.184542] smp: Bringing up secondary CPUs ...
[ 0.194453] Primary instruction cache 32kB, VIPT, 4-way, linesize 32 bytes.
[ 0.194482] Primary data cache 32kB, 4-way, PIPT, no aliases, linesize 32 bytes
[ 0.194498] MIPS secondary cache 256kB, 8-way, linesize 32 bytes.
[ 0.194546] CPU1 revision is: 0001992f (MIPS 1004Kc)
[ 0.254034] Synchronize counters for CPU 1: done.
[ 0.316351] Primary instruction cache 32kB, VIPT, 4-way, linesize 32 bytes.
[ 0.316375] Primary data cache 32kB, 4-way, PIPT, no aliases, linesize 32 bytes
[ 0.316388] MIPS secondary cache 256kB, 8-way, linesize 32 bytes.
[ 0.316418] CPU2 revision is: 0001992f (MIPS 1004Kc)
[ 0.375322] Synchronize counters for CPU 2: done.
[ 0.435768] Primary instruction cache 32kB, VIPT, 4-way, linesize 32 bytes.
[ 0.435792] Primary data cache 32kB, 4-way, PIPT, no aliases, linesize 32 bytes
[ 0.435804] MIPS secondary cache 256kB, 8-way, linesize 32 bytes.
[ 0.435841] CPU3 revision is: 0001992f (MIPS 1004Kc)
[ 0.494923] Synchronize counters for CPU 3: done.
[ 0.554534] smp: Brought up 1 node, 4 CPUs
[ 0.569478] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[ 0.588983] futex hash table entries: 1024 (order: 3, 32768 bytes, linear)
[ 0.606569] pinctrl core: initialized pinctrl subsystem
[ 0.620118] NET: Registered PF_NETLINK/PF_ROUTE protocol family
[ 0.632627] thermal_sys: Registered thermal governor 'step_wise'
[ 0.634714] /pinctrl: Fixed dependency cycle(s) with /pinctrl/pinctrl0
[ 0.663157] FPU Affinity set after 11720 emulations
[ 0.674470] clocksource: Switched to clocksource GIC
[ 0.694254] NET: Registered PF_INET protocol family
[ 0.704102] IP idents hash table entries: 2048 (order: 2, 16384 bytes, linear)
[ 0.719941] tcp_listen_portaddr_hash hash table entries: 512 (order: 0, 4096 bytes, linear)
[ 0.736475] Table-perturb hash table entries: 65536 (order: 6, 262144 bytes, linear)
[ 0.751840] TCP established hash table entries: 1024 (order: 0, 4096 bytes, linear)
[ 0.767046] TCP bind hash table entries: 1024 (order: 2, 16384 bytes, linear)
[ 0.781267] TCP: Hash tables configured (established 1024 bind 1024)
[ 0.794889] MPTCP token hash table entries: 256 (order: 0, 4096 bytes, linear)
[ 0.809487] UDP hash table entries: 256 (order: 1, 8192 bytes, linear)
[ 0.822378] UDP-Lite hash table entries: 256 (order: 1, 8192 bytes, linear)
[ 0.837187] NET: Registered PF_UNIX/PF_LOCAL protocol family
[ 0.848386] PCI: CLS 0 bytes, default 32
[ 0.859890] workingset: timestamp_bits=14 max_order=15 bucket_order=1
[ 0.873791] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[ 0.885287] jffs2: version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME) (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.
[ 0.910765] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 251)
[ 0.929045] mt7621_gpio 1e000600.gpio: registering 32 gpios
[ 0.940575] mt7621_gpio 1e000600.gpio: registering 32 gpios
[ 0.952064] mt7621_gpio 1e000600.gpio: registering 32 gpios
[ 0.963678] mt7621-pci 1e140000.pcie: host bridge /pcie@1e140000 ranges:
[ 0.976952] mt7621-pci 1e140000.pcie: No bus range found for /pcie@1e140000, using [bus 00-ff]
[ 0.994432] mt7621-pci 1e140000.pcie: MEM 0x0060000000..0x006fffffff -> 0x0060000000
[ 1.010645] mt7621-pci 1e140000.pcie: IO 0x001e160000..0x001e16ffff -> 0x0000000000
[ 1.384463] mt7621-pci 1e140000.pcie: pcie1 no card, disable it (RST & CLK)
[ 1.398250] mt7621-pci 1e140000.pcie: pcie2 no card, disable it (RST & CLK)
[ 1.412050] mt7621-pci 1e140000.pcie: PCIE0 enabled
[ 1.421902] PCI coherence region base: 0x60000000, mask/settings: 0xf0000002
[ 1.436033] mt7621-pci 1e140000.pcie: PCI host bridge to bus 0000:00
[ 1.448600] pci_bus 0000:00: root bus resource [bus 00-ff]
[ 1.459438] pci_bus 0000:00: root bus resource [mem 0x60000000-0x6fffffff]
[ 1.473084] pci_bus 0000:00: root bus resource [io 0x0000-0xffff]
[ 1.485423] pci 0000:00:00.0: [0e8d:0801] type 01 class 0x060400
[ 1.497298] pci 0000:00:00.0: reg 0x10: [mem 0x00000000-0x7fffffff]
[ 1.509736] pci 0000:00:00.0: reg 0x14: [mem 0x60200000-0x6020ffff]
[ 1.522233] pci 0000:00:00.0: supports D1
[ 1.530111] pci 0000:00:00.0: PME# supported from D0 D1 D3hot
[ 1.543732] pci 0000:01:00.0: [14c3:7615] type 00 class 0x000280
[ 1.555662] pci 0000:01:00.0: reg 0x10: [mem 0x00000000-0x000fffff 64bit]
[ 1.569247] pci 0000:01:00.0: 2.000 Gb/s available PCIe bandwidth, limited by 2.5 GT/s PCIe x1 link at 0000:00:00.0 (capable of 4.000 Gb/s with 5.0 GT/s PCIe x1 link)
[ 1.599040] pci 0000:00:00.0: PCI bridge to [bus 01-ff]
[ 1.609357] pci 0000:00:00.0: bridge window [io 0x0000-0x0fff]
[ 1.621419] pci 0000:00:00.0: bridge window [mem 0x60000000-0x600fffff]
[ 1.634908] pci 0000:00:00.0: bridge window [mem 0x60100000-0x601fffff pref]
[ 1.649243] pci_bus 0000:01: busn_res: [bus 01-ff] end is updated to 01
[ 1.662414] pci 0000:00:00.0: BAR 0: no space for [mem size 0x80000000]
[ 1.675502] pci 0000:00:00.0: BAR 0: failed to assign [mem size 0x80000000]
[ 1.689338] pci 0000:00:00.0: BAR 8: assigned [mem 0x60000000-0x600fffff]
[ 1.702818] pci 0000:00:00.0: BAR 9: assigned [mem 0x60100000-0x601fffff pref]
[ 1.717150] pci 0000:00:00.0: BAR 1: assigned [mem 0x60200000-0x6020ffff]
[ 1.730634] pci 0000:00:00.0: BAR 7: assigned [io 0x0000-0x0fff]
[ 1.742732] pci 0000:01:00.0: BAR 0: assigned [mem 0x60000000-0x600fffff 64bit]
[ 1.757258] pci 0000:00:00.0: PCI bridge to [bus 01]
[ 1.767091] pci 0000:00:00.0: bridge window [io 0x0000-0x0fff]
[ 1.779186] pci 0000:00:00.0: bridge window [mem 0x60000000-0x600fffff]
[ 1.792663] pci 0000:00:00.0: bridge window [mem 0x60100000-0x601fffff pref]
[ 1.807005] pci_bus 0000:00: Some PCI device resources are unassigned, try booting with pci=realloc
[ 1.824983] pci_bus 0000:00: resource 4 [mem 0x60000000-0x6fffffff]
[ 1.837417] pci_bus 0000:00: resource 5 [io 0x0000-0xffff]
[ 1.848476] pci_bus 0000:01: resource 0 [io 0x0000-0x0fff]
[ 1.859535] pci_bus 0000:01: resource 1 [mem 0x60000000-0x600fffff]
[ 1.871976] pci_bus 0000:01: resource 2 [mem 0x60100000-0x601fffff pref]
[ 1.886894] Serial: 8250/16550 driver, 16 ports, IRQ sharing enabled
[ 1.908663] printk: console [ttyS0] disabled
[ 1.917899] 1e000c00.uartlite: ttyS0 at MMIO 0x1e000c00 (irq = 18, base_baud = 3125000) is a 16550A
[ 1.935891] printk: console [ttyS0] enabled
[ 1.952415] printk: bootconsole [early0] disabled
[ 1.976454] spi-mt7621 1e000b00.spi: sys_freq: 220000000
[ 1.988497] spi-nor spi0.0: mx25l12805d (16384 Kbytes)
[ 1.999020] 4 fixed-partitions partitions found on MTD device spi0.0
[ 2.011765] OF: Bad cell count for /palmbus@1e000000/spi@b00/flash@0/partitions
[ 2.026368] OF: Bad cell count for /palmbus@1e000000/spi@b00/flash@0/partitions
[ 2.041247] Creating 4 MTD partitions on "spi0.0":
[ 2.050834] 0x000000000000-0x000000030000 : "u-boot"
[ 2.062486] 0x000000030000-0x000000040000 : "u-boot-env"
[ 2.074524] 0x000000040000-0x000000050000 : "factory"
[ 2.086028] OF: Bad cell count for /palmbus@1e000000/spi@b00/flash@0/partitions
[ 2.100972] 0x000000050000-0x000001000000 : "firmware"
[ 2.112720] 2 uimage-fw partitions found on MTD device firmware
[ 2.124584] Creating 2 MTD partitions on "firmware":
[ 2.134498] 0x000000000000-0x000000307305 : "kernel"
[ 2.144374] mtd: partition "kernel" doesn't end on an erase/write block -- force read-only
[ 2.162111] 0x000000307305-0x000000fb0000 : "rootfs"
[ 2.172057] mtd: partition "rootfs" doesn't start on an erase/write block boundary -- force read-only
[ 2.191541] mtd: setting mtd5 (rootfs) as root device
[ 2.201738] 1 squashfs-split partitions found on MTD device rootfs
[ 2.214060] 0x000000750000-0x000000fb0000 : "rootfs_data"
[ 2.367792] mt7530-mdio mdio-bus:1f: MT7530 adapts as multi-chip module
[ 2.389084] mtk_soc_eth 1e100000.ethernet eth0: mediatek frame engine at 0xbe100000, irq 19
[ 2.407398] i2c_dev: i2c /dev entries driver
[ 2.420475] NET: Registered PF_INET6 protocol family
[ 2.433090] Segment Routing with IPv6
[ 2.440522] In-situ OAM (IOAM) with IPv6
[ 2.448481] NET: Registered PF_PACKET protocol family
[ 2.458629] bridge: filtering via arp/ip/ip6tables is no longer available by default. Update your scripts to load br_netfilter if you need this.
[ 2.484983] 8021q: 802.1Q VLAN Support v1.8
[ 2.524003] mt7530-mdio mdio-bus:1f: MT7530 adapts as multi-chip module
[ 2.564657] mt7530-mdio mdio-bus:1f: configuring for fixed/rgmii link mode
[ 2.579784] mt7530-mdio mdio-bus:1f lan (uninitialized): PHY [mt7530-0:00] driver [MediaTek MT7530 PHY] (irq=21)
[ 2.602387] mt7530-mdio mdio-bus:1f: Link is Up - 1Gbps/Full - flow control rx/tx
[ 2.606284] mtk_soc_eth 1e100000.ethernet eth0: entered promiscuous mode
[ 2.630961] DSA: tree 0 setup
[ 2.637848] clk: Disabling unused clocks
[ 2.651458] VFS: Mounted root (squashfs filesystem) readonly on device 31:5.
[ 2.669460] Freeing unused kernel image (initmem) memory: 1284K
[ 2.681322] This architecture does not have kernel memory protection.
[ 2.694240] Run /sbin/init as init process
[ 2.702415] with arguments:
[ 2.702425] /sbin/init
[ 2.702432] with environment:
[ 2.702437] HOME=/
[ 2.702443] TERM=linux
[ 3.151924] init: Console is alive
[ 3.159085] init: - watchdog -
[ 3.888711] kmodloader: loading kernel modules from /etc/modules-boot.d/*
[ 3.946860] gpio_button_hotplug: loading out-of-tree module taints kernel.
[ 3.968211] kmodloader: done loading kernel modules from /etc/modules-boot.d/*
[ 3.986059] init: - preinit -
[ 8.204461] random: crng init done
[ 8.755367] mtk_soc_eth 1e100000.ethernet eth0: configuring for fixed/rgmii link mode
[ 8.775718] mtk_soc_eth 1e100000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
[ 8.776122] mt7530-mdio mdio-bus:1f lan: configuring for phy/gmii link mode
[ 12.742276] mt7530-mdio mdio-bus:1f lan: Link is Up - 1Gbps/Full - flow control rx/tx
[ 13.212066] jffs2: notice: (560) jffs2_build_xattr_subsystem: complete building xattr subsystem, 22 of xdatum (7 unchecked, 11 orphan) and 27 of xref (8 dead, 5 orphan) found.
[ 13.245225] mount_root: switching to jffs2 overlay
[ 13.262571] overlayfs: upper fs does not support tmpfile.
[ 13.283667] urandom-seed: Seeding with /etc/urandom.seed
[ 13.386690] mt7530-mdio mdio-bus:1f lan: Link is Down
[ 13.407616] procd: - early -
[ 13.413582] procd: - watchdog -
[ 14.026932] procd: - watchdog -
[ 14.034635] procd: - ubus -
[ 14.225931] procd: - init -
[ 14.913721] kmodloader: loading kernel modules from /etc/modules.d/*
[ 14.987013] mtk-eip93 1e004000.crypto: EIP93 Crypto Engine Initialized.
[ 15.370393] jitterentropy: Initialization failed with host not compliant with requirements: 9
[ 15.524878] Loading modules backported from Linux version v6.12.6-0-ge9d65b48ce1a
[ 15.539825] Backport generated by backports.git v6.1.110-1-35-g410656ef04d2
[ 15.759663] pci 0000:00:00.0: enabling device (0006 -> 0007)
[ 15.771041] mt7615e 0000:01:00.0: enabling device (0000 -> 0002)
[ 15.794046] mt7615e 0000:01:00.0: registering led 'mt76-phy0'
[ 15.875918] ieee80211 phy0: Selected rate control algorithm 'minstrel_ht'
[ 15.875984] ieee80211 phy0: copying sband (band 1) due to VHT EXT NSS BW flag
[ 15.911083] mt7615e 0000:01:00.0: HW/SW Version: 0x8a108a10, Build Time: 20180518100604a
[ 15.911083]
[ 15.951076] PPP generic driver version 2.4.2
[ 15.961932] NET: Registered PF_PPPOX protocol family
[ 16.110788] urngd: v1.0.2 started.
[ 16.184549] mt7615e 0000:01:00.0: N9 Firmware Version: _reserved_, Build Time: 20200814163649
[ 16.211820] mt7615e 0000:01:00.0: CR4 Firmware Version: _reserved_, Build Time: 20190415154149
[ 16.381508] jitterentropy: Initialization failed with host not compliant with requirements: 9
[ 16.505079] kmodloader: 1 module could not be probed
[ 16.515487] kmodloader: - jitterentropy_rng - 0
[ 25.113810] mtk_soc_eth 1e100000.ethernet eth0: Link is Down
[ 25.147409] mtk_soc_eth 1e100000.ethernet eth0: configuring for fixed/rgmii link mode
[ 25.163710] mtk_soc_eth 1e100000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
[ 25.171277] mt7530-mdio mdio-bus:1f lan: configuring for phy/gmii link mode
[ 25.196954] br-lan: port 1(lan) entered blocking state
[ 25.207433] br-lan: port 1(lan) entered disabled state
[ 25.218031] mt7530-mdio mdio-bus:1f lan: entered allmulticast mode
[ 25.230536] mtk_soc_eth 1e100000.ethernet eth0: entered allmulticast mode
[ 25.247983] mt7530-mdio mdio-bus:1f lan: entered promiscuous mode
[ 28.666653] mt7530-mdio mdio-bus:1f lan: Link is Up - 1Gbps/Full - flow control rx/tx
[ 28.666750] br-lan: port 1(lan) entered blocking state
[ 28.692575] br-lan: port 1(lan) entered forwarding state
[ 31.051792] phy0-sta0: authenticate with 94:83:c4:a9:b8:66 (local address=a0:a3:f0:91:43:95)
[ 31.068756] phy0-sta0: send auth to 94:83:c4:a9:b8:66 (try 1/3)
[ 31.142941] phy0-sta0: authenticate with 94:83:c4:a9:b8:66 (local address=a0:a3:f0:91:43:95)
[ 31.159979] phy0-sta0: send auth to 94:83:c4:a9:b8:66 (try 1/3)
[ 31.177805] phy0-sta0: authenticated
[ 31.194971] phy0-sta0: associate with 94:83:c4:a9:b8:66 (try 1/3)
[ 31.211115] phy0-sta0: RX AssocResp from 94:83:c4:a9:b8:66 (capab=0x1031 status=0 aid=9)
[ 31.228963] phy0-sta0: associated
[ 31.805663] phy0-sta0: Limiting TX power to 36 (36 - 0) dBm as advertised by 94:83:c4:a9:b8:66
hexdump -C /dev/mtd2
Exceeds char limit. I paste it here:
There is a bug on eeprom. I just noticed it has already been clarified in
This problem is due to DBDC might not be enabled correctly in EEPROM.
The nonintrusive solution is to enable DBDC manually via this:
wifi down
echo 1 > /sys/kernel/debug/ieee80211/phy0/mt76/dbdc
wifi up
After DBDC is enabled (manually or automatically), phy0, which is the 2.4 GHz radio, thinks it's actually a dual-band radio (2.4+5), so the default configuration for it is bad.
Luci will help you fix it. Choose mode N and a channel, save the changes, and you'll be able to configure that radio using Luci or by editing the /etc/config/wireless file.
Those three lines can be put in rc.local to run automatically every boot.
I'm using the latest stable version 24.10 on three DAP-1620s as dumb access points, working very well on 2.4 GHz, including the guest network, and on 5 GHz.
My only complaint is that the maximum power allowed by the driver on the 5 GHz network is 15 dBm. Everything else works fine.
Let's see if we can find a way to get this driver to at least reach 20-23 dBm.
Does anyone know anything about this?
I think bad "news" for you (and me too) about MT7615DN even if you are having higher dbm:
In 25.12 this workaround does not work
wifi down
echo 1 > /sys/kernel/debug/ieee80211/phy0/mt76/dbdc
wifi up
Does not help with 25.12.5 ...
It seems, that the latest 25.12 release does not support the DAP-1620 B1.
Techdata webpage says - Supported Current Rel: 24.10.5
After installing 25.12.5 (from original dlink firmware) i lost a radio.
iw phy shows only one radio.
root@OpenWrt:~# iw phy
Wiphy phy0
wiphy index: 0
max # scan SSIDs: 4
max scan IEs length: 2304 bytes
max # sched scan SSIDs: 0
max # match sets: 0
Retry short limit: 7
Retry long limit: 4
Coverage class: 0 (up to 0m)
Device supports AP-side u-APSD.
Device supports T-DLS.
Available Antennas: TX 0xf RX 0xf
Configured Antennas: TX 0xf RX 0xf
Supported interface modes:
* IBSS
* managed
* AP
* AP/VLAN
* monitor
* mesh point
* P2P-client
* P2P-GO
Band 1:
Capabilities: 0x1ff
RX LDPC
HT20/HT40
SM Power Save disabled
RX Greenfield
RX HT20 SGI
RX HT40 SGI
TX STBC
RX STBC 1-stream
Max AMSDU length: 3839 bytes
No DSSS/CCK HT40
Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
Minimum RX AMPDU time spacing: No restriction (0x00)
HT TX/RX MCS rate indexes supported: 0-31
Frequencies:
* 2412.0 MHz [1] (20.0 dBm)
* 2417.0 MHz [2] (20.0 dBm)
* 2422.0 MHz [3] (20.0 dBm)
* 2427.0 MHz [4] (20.0 dBm)
* 2432.0 MHz [5] (20.0 dBm)
* 2437.0 MHz [6] (20.0 dBm)
* 2442.0 MHz [7] (20.0 dBm)
* 2447.0 MHz [8] (20.0 dBm)
* 2452.0 MHz [9] (20.0 dBm)
* 2457.0 MHz [10] (20.0 dBm)
* 2462.0 MHz [11] (20.0 dBm)
* 2467.0 MHz [12] (20.0 dBm) (no IR)
* 2472.0 MHz [13] (20.0 dBm) (no IR)
* 2484.0 MHz [14] (20.0 dBm) (no IR)
Band 2:
Capabilities: 0x1ff
RX LDPC
HT20/HT40
SM Power Save disabled
RX Greenfield
RX HT20 SGI
RX HT40 SGI
TX STBC
RX STBC 1-stream
Max AMSDU length: 3839 bytes
No DSSS/CCK HT40
Maximum RX AMPDU length 65535 bytes (exponent: 0x003)
Minimum RX AMPDU time spacing: No restriction (0x00)
HT TX/RX MCS rate indexes supported: 0-31
VHT Capabilities (0x338001f8):
Max MPDU length: 3895
Supported Channel Width: 160 MHz, 80+80 MHz
RX LDPC
short GI (80 MHz)
short GI (160/80+80 MHz)
TX STBC
RX antenna pattern consistency
TX antenna pattern consistency
VHT RX MCS set:
1 streams: MCS 0-9
2 streams: MCS 0-9
3 streams: MCS 0-9
4 streams: MCS 0-9
5 streams: not supported
6 streams: not supported
7 streams: not supported
8 streams: not supported
VHT RX highest supported: 0 Mbps
VHT TX MCS set:
1 streams: MCS 0-9
2 streams: MCS 0-9
3 streams: MCS 0-9
4 streams: MCS 0-9
5 streams: not supported
6 streams: not supported
7 streams: not supported
8 streams: not supported
VHT TX highest supported: 0 Mbps
VHT extended NSS: not supported
Frequencies:
* 5180.0 MHz [36] (18.0 dBm)
* 5200.0 MHz [40] (18.0 dBm)
* 5220.0 MHz [44] (18.0 dBm)
* 5240.0 MHz [48] (18.0 dBm)
* 5260.0 MHz [52] (18.0 dBm) (no IR, radar detection)
* 5280.0 MHz [56] (18.0 dBm) (no IR, radar detection)
* 5300.0 MHz [60] (18.0 dBm) (no IR, radar detection)
* 5320.0 MHz [64] (18.0 dBm) (no IR, radar detection)
* 5500.0 MHz [100] (18.0 dBm) (no IR, radar detection)
* 5520.0 MHz [104] (18.0 dBm) (no IR, radar detection)
* 5540.0 MHz [108] (18.0 dBm) (no IR, radar detection)
* 5560.0 MHz [112] (18.0 dBm) (no IR, radar detection)
* 5580.0 MHz [116] (18.0 dBm) (no IR, radar detection)
* 5600.0 MHz [120] (18.0 dBm) (no IR, radar detection)
* 5620.0 MHz [124] (18.0 dBm) (no IR, radar detection)
* 5640.0 MHz [128] (18.0 dBm) (no IR, radar detection)
* 5660.0 MHz [132] (18.0 dBm) (no IR, radar detection)
* 5680.0 MHz [136] (18.0 dBm) (no IR, radar detection)
* 5700.0 MHz [140] (18.0 dBm) (no IR, radar detection)
* 5720.0 MHz [144] (18.0 dBm) (no IR, radar detection)
* 5745.0 MHz [149] (18.0 dBm) (no IR)
* 5765.0 MHz [153] (18.0 dBm) (no IR)
* 5785.0 MHz [157] (18.0 dBm) (no IR)
* 5805.0 MHz [161] (18.0 dBm) (no IR)
* 5825.0 MHz [165] (18.0 dBm) (no IR)
* 5845.0 MHz [169] (disabled)
* 5865.0 MHz [173] (disabled)
* 5885.0 MHz [177] (disabled)
valid interface combinations:
* #{ IBSS } <= 1, #{ managed, AP, mesh point, P2P-client, P2P-GO } <= 16,
total <= 16, #channels <= 1, STA/AP BI must match, radar detect widths: { 20 MHz (no HT), 20 MHz, 40 MHz, 80 MHz, 80+80 MHz, 160 MHz }
HT Capability overrides:
* MCS: ff ff ff ff ff ff ff ff ff ff
* maximum A-MSDU length
* supported channel width
* short GI for 40 MHz
* max A-MPDU length exponent
* min MPDU start spacing
max # scan plans: 1
max scan plan interval: 0
max scan plan iterations: 0
Supported extended features:
* [ VHT_IBSS ]: VHT-IBSS
* [ RRM ]: RRM
* [ MU_MIMO_AIR_SNIFFER ]: MU-MIMO sniffer
* [ SET_SCAN_DWELL ]: scan dwell setting
* [ FILS_STA ]: STA FILS (Fast Initial Link Setup)
* [ CQM_RSSI_LIST ]: multiple CQM_RSSI_THOLD records
* [ CONTROL_PORT_OVER_NL80211 ]: control port over nl80211
* [ TXQS ]: FQ-CoDel-enabled intermediate TXQs
* [ CAN_REPLACE_PTK0 ]: can safely replace PTK 0 when rekeying
* [ AIRTIME_FAIRNESS ]: airtime fairness scheduling
* [ AQL ]: Airtime Queue Limits (AQL)
* [ CONTROL_PORT_NO_PREAUTH ]: disable pre-auth over nl80211 control port support
* [ DEL_IBSS_STA ]: deletion of IBSS station support
* [ SCAN_FREQ_KHZ ]: scan on kHz frequency support
* [ CONTROL_PORT_OVER_NL80211_TX_STATUS ]: tx status for nl80211 control port support
* [ POWERED_ADDR_CHANGE ]: can change MAC address while up
root@OpenWrt:~#
In the past—likely up to OpenWrt 24.12.5—there was apparently a workaround (in rc.local):
wifi down
echo 1 > /sys/kernel/debug/ieee80211/phy0/mt76/dbdc
wifi up
Unfortunately, this no longer works with 25.12x.
What am I doing wrong?
The method in `rc.local` no longer works!!:
wifi down
echo 1 > /sys/kernel/debug/ieee80211/phy0/mt76/dbdc
wifi up
It works perfectly as a script in /etc/hotplug.d/net/99-mt76-dbdc:
#!/bin/sh
[ "$ACTION" = "add" ] || exit 0
[ "$DEVTYPE" = "wlan" ] || exit 0PHY="/sys/kernel/debug/ieee80211/phy0/mt76/dbdc"
[ -e "$PHY" ] && echo 1 > "$PHY"
However, the DBDC setup is a pain because the transmit power gets reduced accordingly;
only 15 dBm is available for 5 GHz and 19 dBm for 2.4 GHz.
Anyway, the problem with the second radio is solved. Oh, and the first radio supports 2.4 and 5 GHz, while the second one only supports 5 GHz.
Have fun with it...