Hi @jeff, I'm getting the same problem, reported here: Wifi 5G not working properly on Archer C60 v2
dmesg
[ 0.000000] Linux version 4.9.120 (buildbot@builds-03.infra.lede-project.org) (gcc version 7.3.0 (OpenWrt GCC 7.3.0 r7102-3f3a2c9) ) #0 Thu Aug 16 07:51:15 2018
[ 0.000000] MyLoader: sysp=2fd0d7d9, boardp=b627bc06, parts=a852b6fc
[ 0.000000] bootconsole [early0] enabled
[ 0.000000] CPU0 revision is: 00019750 (MIPS 74Kc)
[ 0.000000] SoC: Qualcomm Atheros QCA956X ver 1 rev 0
[ 0.000000] Determined physical RAM map:
[ 0.000000] memory: 04000000 @ 00000000 (usable)
[ 0.000000] Initrd not found or empty - disabling initrd
[ 0.000000] Primary instruction cache 64kB, VIPT, 4-way, linesize 32 bytes.
[ 0.000000] Primary data cache 32kB, 4-way, VIPT, cache aliases, linesize 32 bytes
[ 0.000000] Zone ranges:
[ 0.000000] Normal [mem 0x0000000000000000-0x0000000003ffffff]
[ 0.000000] Movable zone start for each node
[ 0.000000] Early memory node ranges
[ 0.000000] node 0: [mem 0x0000000000000000-0x0000000003ffffff]
[ 0.000000] Initmem setup node 0 [mem 0x0000000000000000-0x0000000003ffffff]
[ 0.000000] On node 0 totalpages: 16384
[ 0.000000] free_area_init_node: node 0, pgdat 80442044, node_mem_map 81000020
[ 0.000000] Normal zone: 128 pages used for memmap
[ 0.000000] Normal zone: 0 pages reserved
[ 0.000000] Normal zone: 16384 pages, LIFO batch:3
[ 0.000000] pcpu-alloc: s0 r0 d32768 u32768 alloc=1*32768
[ 0.000000] pcpu-alloc: [0] 0
[ 0.000000] Built 1 zonelists in Zone order, mobility grouping on. Total pages: 16256
[ 0.000000] Kernel command line: board=ARCHER-C60-V2 mtdparts=spi0.0:192k(u-boot)ro,7808k(firmware),128k(tplink)ro,64k(art)ro console=ttyS0,115200 rootfstype=squashfs noinitrd
[ 0.000000] PID hash table entries: 256 (order: -2, 1024 bytes)
[ 0.000000] Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
[ 0.000000] Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
[ 0.000000] Writing ErrCtl register=00000000
[ 0.000000] Readback ErrCtl register=00000000
[ 0.000000] Memory: 60020K/65536K available (3363K kernel code, 172K rwdata, 444K rodata, 300K init, 219K bss, 5516K reserved, 0K cma-reserved)
[ 0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[ 0.000000] NR_IRQS:51
[ 0.000000] Clocks: CPU:775.000MHz, DDR:650.000MHz, AHB:258.333MHz, Ref:25.000MHz
[ 0.000000] clocksource: MIPS: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 4932285024 ns
[ 0.000007] sched_clock: 32 bits at 387MHz, resolution 2ns, wraps every 5541893118ns
[ 0.008222] Calibrating delay loop... 385.84 BogoMIPS (lpj=1929216)
[ 0.071034] pid_max: default: 32768 minimum: 301
[ 0.075987] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.082967] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.092716] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[ 0.103117] futex hash table entries: 256 (order: -1, 3072 bytes)
[ 0.110586] NET: Registered protocol family 16
[ 0.116590] MIPS: machine is TP-LINK Archer C60 v2
[ 0.600011] registering PCI controller with io_map_base unset
[ 0.606105] Can't analyze schedule() prologue at 803a5594
[ 0.621096] PCI host bridge to bus 0000:00
[ 0.625419] pci_bus 0000:00: root bus resource [mem 0x12000000-0x13ffffff]
[ 0.632700] pci_bus 0000:00: root bus resource [io 0x0001]
[ 0.638565] pci_bus 0000:00: root bus resource [??? 0x00000000 flags 0x0]
[ 0.645721] pci_bus 0000:00: No busn resource found for root bus, will use [bus 00-ff]
[ 0.654090] pci 0000:00:00.0: [168c:0056] type 00 class 0x028000
[ 0.654099] pci 0000:00:00.0: invalid calibration data
[ 0.659543] pci 0000:00:00.0: reg 0x10: [mem 0x00000000-0x001fffff 64bit]
[ 0.659656] pci 0000:00:00.0: PME# supported from D0 D3hot
[ 0.659846] pci_bus 0000:00: busn_res: [bus 00-ff] end is updated to 00
[ 0.659869] pci 0000:00:00.0: BAR 0: assigned [mem 0x12000000-0x121fffff 64bit]
[ 0.667591] pci 0000:00:00.0: using irq 40 for pin 1
[ 0.675633] clocksource: Switched to clocksource MIPS
[ 0.681854] NET: Registered protocol family 2
[ 0.687286] TCP established hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.694643] TCP bind hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.701386] TCP: Hash tables configured (established 1024 bind 1024)
[ 0.708176] UDP hash table entries: 256 (order: 0, 4096 bytes)
[ 0.714340] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
[ 0.721201] NET: Registered protocol family 1
[ 0.725861] PCI: CLS 0 bytes, default 32
[ 0.728263] Crashlog allocated RAM at address 0x3f00000
[ 0.734698] workingset: timestamp_bits=30 max_order=14 bucket_order=0
[ 0.747423] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[ 0.753568] jffs2: version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME) (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.
[ 0.772078] io scheduler noop registered
[ 0.776249] io scheduler deadline registered (default)
[ 0.782030] Serial: 8250/16550 driver, 16 ports, IRQ sharing enabled
[ 0.790923] console [ttyS0] disabled
[ 0.814760] serial8250.0: ttyS0 at MMIO 0x18020000 (irq = 11, base_baud = 1562500) is a 16550A
[ 0.823855] console [ttyS0] enabled
[ 0.831404] bootconsole [early0] disabled
[ 0.845180] m25p80 spi0.0: found gd25q64, expected m25p80
[ 0.852934] m25p80 spi0.0: gd25q64 (8192 Kbytes)
[ 0.857758] 4 cmdlinepart partitions found on MTD device spi0.0
[ 0.863867] Creating 4 MTD partitions on "spi0.0":
[ 0.868845] 0x000000000000-0x000000030000 : "u-boot"
[ 0.875561] 0x000000030000-0x0000007d0000 : "firmware"
[ 0.895127] 2 uimage-fw partitions found on MTD device firmware
[ 0.901292] 0x000000030000-0x0000001b0000 : "kernel"
[ 0.907590] 0x0000001b0000-0x0000007d0000 : "rootfs"
[ 0.914093] mtd: device 3 (rootfs) set to be root filesystem
[ 0.920018] 1 squashfs-split partitions found on MTD device rootfs
[ 0.926420] 0x000000470000-0x0000007d0000 : "rootfs_data"
[ 0.933826] 0x0000007d0000-0x0000007f0000 : "tplink"
[ 0.940716] 0x0000007f0000-0x000000800000 : "art"
[ 0.948179] libphy: Fixed MDIO Bus: probed
[ 0.988260] libphy: ag71xx_mdio: probed
[ 1.003489] libphy: ag71xx_mdio: probed
[ 1.638142] ag71xx ag71xx.0: connected to PHY at ag71xx-mdio.1:04 [uid=004dd042, driver=Generic PHY]
[ 1.648172] eth0: Atheros AG71xx at 0xb9000000, irq 4, mode:MII
[ 2.277816] ag71xx-mdio.1: Found an AR934X built-in switch
[ 2.330501] eth1: Atheros AG71xx at 0xba000000, irq 5, mode:GMII
[ 2.338470] NET: Registered protocol family 10
[ 2.346817] NET: Registered protocol family 17
[ 2.351461] bridge: filtering via arp/ip/ip6tables is no longer available by default. Update your scripts to load br_netfilter if you need this.
[ 2.364964] 8021q: 802.1Q VLAN Support v1.8
[ 2.370844] hctosys: unable to open rtc device (rtc0)
[ 2.381045] VFS: Mounted root (squashfs filesystem) readonly on device 31:3.
[ 2.390003] Freeing unused kernel memory: 300K
[ 2.394592] This architecture does not have kernel memory protection.
[ 2.565646] random: fast init done
[ 3.054460] init: Console is alive
[ 3.058219] init: - watchdog -
[ 3.972932] kmodloader: loading kernel modules from /etc/modules-boot.d/*
[ 4.016477] kmodloader: done loading kernel modules from /etc/modules-boot.d/*
[ 4.025235] init: - preinit -
[ 4.645227] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 4.671436] random: procd: uninitialized urandom read (4 bytes read)
[ 7.816595] eth0: link up (100Mbps/Full duplex)
[ 7.821456] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[ 7.924272] jffs2_scan_eraseblock(): End of filesystem marker found at 0x10000
[ 7.931767] jffs2_build_filesystem(): unlocking the mtd device...
[ 7.938014] done.
[ 7.940000] jffs2_build_filesystem(): erasing all blocks after the end marker...
[ 19.368078] done.
[ 19.370097] jffs2: notice: (474) jffs2_build_xattr_subsystem: complete building xattr subsystem, 0 of xdatum (0 unchecked, 0 orphan) and 0 of xref (0 dead, 0 orphan) found.
[ 19.387453] mount_root: overlay filesystem has not been fully initialized yet
[ 19.400533] mount_root: switching to jffs2 overlay
[ 19.712752] urandom-seed: Seed file not found (/etc/urandom.seed)
[ 19.806777] eth0: link down
[ 19.819733] procd: - early -
[ 19.822790] procd: - watchdog -
[ 20.427490] procd: - watchdog -
[ 20.430970] procd: - ubus -
[ 20.530894] random: ubusd: uninitialized urandom read (4 bytes read)
[ 20.538381] random: ubusd: uninitialized urandom read (4 bytes read)
[ 20.545328] random: ubusd: uninitialized urandom read (4 bytes read)
[ 20.552731] procd: - init -
[ 20.844800] kmodloader: loading kernel modules from /etc/modules.d/*
[ 20.855080] ip6_tables: (C) 2000-2006 Netfilter Core Team
[ 20.869934] Loading modules backported from Linux version wt-2017-11-01-0-gfe248fc2c180
[ 20.878255] Backport generated by backports.git v4.14-rc2-1-31-g86cf0e5d
[ 20.887618] ip_tables: (C) 2000-2006 Netfilter Core Team
[ 20.900064] nf_conntrack version 0.5.0 (1024 buckets, 4096 max)
[ 20.950845] xt_time: kernel timezone is -0000
[ 20.998456] PPP generic driver version 2.4.2
[ 21.004926] NET: Registered protocol family 24
[ 21.030038] PCI: Enabling device 0000:00:00.0 (0000 -> 0002)
[ 21.036242] ath10k_pci 0000:00:00.0: pci irq legacy oper_irq_mode 1 irq_mode 0 reset_mode 0
[ 21.227519] ath10k_pci 0000:00:00.0: Direct firmware load for ath10k/pre-cal-pci-0000:00:00.0.bin failed with error -2
[ 21.238607] ath10k_pci 0000:00:00.0: Falling back to user helper
[ 60.962532] ath10k_pci 0000:00:00.0: Direct firmware load for ath10k/QCA9888/hw2.0/firmware-6.bin failed with error -2
[ 60.973621] ath10k_pci 0000:00:00.0: Falling back to user helper
[ 61.066059] firmware ath10k!QCA9888!hw2.0!firmware-6.bin: firmware_loading_store: map pages failed
[ 61.661243] ath10k_pci 0000:00:00.0: qca9888 hw2.0 target 0x01000000 chip_id 0x00000000 sub 0000:0000
[ 61.670806] ath10k_pci 0000:00:00.0: kconfig debug 0 debugfs 1 tracing 0 dfs 1 testmode 1
[ 61.691308] ath10k_pci 0000:00:00.0: firmware ver 10.4-3.5.3-00053 api 5 features no-p2p,mfp,peer-flow-ctrl,allows-mesh-bcast,no-ps crc32 a9603656
[ 62.007533] ath10k_pci 0000:00:00.0: failed to fetch board data for bus=pci,bmi-chip-id=0,bmi-board-id=20 from ath10k/QCA9888/hw2.0/board-2.bin
[ 62.021334] ath10k_pci 0000:00:00.0: board_file api 1 bmi_id 0:20 crc32 44e0011f
[ 64.178412] ath10k_pci 0000:00:00.0: htt-ver 2.2 wmi-op 6 htt-op 4 cal pre-cal-file max-sta 512 raw 0 hwcrypto 1
[ 64.286753] ath: EEPROM regdomain: 0x0
[ 64.286760] ath: EEPROM indicates default country code should be used
[ 64.286763] ath: doing EEPROM country->regdmn map search
[ 64.286774] ath: country maps to regdmn code: 0x3a
[ 64.286778] ath: Country alpha2 being used: US
[ 64.286781] ath: Regpair used: 0x3a
[ 64.344774] ath: EEPROM regdomain: 0x0
[ 64.344781] ath: EEPROM indicates default country code should be used
[ 64.344784] ath: doing EEPROM country->regdmn map search
[ 64.344796] ath: country maps to regdmn code: 0x3a
[ 64.344800] ath: Country alpha2 being used: US
[ 64.344803] ath: Regpair used: 0x3a
[ 64.355473] ieee80211 phy1: Selected rate control algorithm 'minstrel_ht'
[ 64.359164] ieee80211 phy1: Atheros AR9561 Rev:0 mem=0xb8100000, irq=47
[ 64.433801] kmodloader: done loading kernel modules from /etc/modules.d/*
[ 65.084289] urandom_read: 5 callbacks suppressed
[ 65.084295] random: jshn: uninitialized urandom read (4 bytes read)
[ 72.395162] IPv6: ADDRCONF(NETDEV_UP): eth1: link is not ready
[ 72.420397] br-lan: port 1(eth1.1) entered blocking state
[ 72.426031] br-lan: port 1(eth1.1) entered disabled state
[ 72.431941] device eth1.1 entered promiscuous mode
[ 72.436933] device eth1 entered promiscuous mode
[ 72.465893] IPv6: ADDRCONF(NETDEV_UP): br-lan: link is not ready
[ 72.509284] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 72.529013] IPv6: ADDRCONF(NETDEV_UP): eth1.2: link is not ready
[ 73.800146] ath: EEPROM regdomain: 0x804c
[ 73.804296] ath: EEPROM indicates we should expect a country code
[ 73.810631] ath: doing EEPROM country->regdmn map search
[ 73.816119] ath: country maps to regdmn code: 0x3b
[ 73.821059] ath: Country alpha2 being used: BR
[ 73.825654] ath: Regpair used: 0x3b
[ 73.829250] ath: regdomain 0x804c dynamically updated by user
[ 73.835258] ath: EEPROM regdomain: 0x804c
[ 73.839403] ath: EEPROM indicates we should expect a country code
[ 73.845695] ath: doing EEPROM country->regdmn map search
[ 73.851173] ath: country maps to regdmn code: 0x3b
[ 73.856119] ath: Country alpha2 being used: BR
[ 73.860706] ath: Regpair used: 0x3b
[ 73.864301] ath: regdomain 0x804c dynamically updated by user
[ 74.397775] eth1: link up (1000Mbps/Full duplex)
[ 74.402573] IPv6: ADDRCONF(NETDEV_CHANGE): eth1: link becomes ready
[ 74.507065] br-lan: port 1(eth1.1) entered blocking state
[ 74.512651] br-lan: port 1(eth1.1) entered forwarding state
[ 74.518587] IPv6: ADDRCONF(NETDEV_CHANGE): eth1.2: link becomes ready
[ 74.629802] IPv6: ADDRCONF(NETDEV_CHANGE): br-lan: link becomes ready
[ 74.708588] eth0: link up (100Mbps/Full duplex)
[ 74.713315] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[ 79.659426] IPv6: ADDRCONF(NETDEV_UP): wlan0: link is not ready
[ 79.684616] IPv6: ADDRCONF(NETDEV_UP): wlan1: link is not ready
[ 79.757820] br-lan: port 2(wlan0) entered blocking state
[ 79.763397] br-lan: port 2(wlan0) entered disabled state
[ 79.769309] device wlan0 entered promiscuous mode
[ 79.811318] br-lan: port 3(wlan1) entered blocking state
[ 79.816985] br-lan: port 3(wlan1) entered disabled state
[ 79.822795] device wlan1 entered promiscuous mode
[ 88.139513] IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready
[ 88.146285] br-lan: port 3(wlan1) entered blocking state
[ 88.151777] br-lan: port 3(wlan1) entered forwarding state
[ 97.391362] random: crng init done
[ 100.272887] IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready
[ 100.279715] br-lan: port 2(wlan0) entered blocking state
[ 100.285227] br-lan: port 2(wlan0) entered forwarding state
[ 300.539971] kmodloader: loading kernel modules from /etc/modules.d/*
[ 300.554403] Netfilter messages via NETLINK v0.30.
[ 300.562701] ip_set: protocol 6
[ 300.615840] kmodloader: done loading kernel modules from /etc/modules.d/*
[ 300.752334] kmodloader: loading kernel modules from /etc/modules.d/*
[ 300.762805] kmodloader: done loading kernel modules from /etc/modules.d/*
[ 300.853911] kmodloader: loading kernel modules from /etc/modules.d/*
[ 300.863322] kmodloader: done loading kernel modules from /etc/modules.d/*
[ 301.006377] kmodloader: loading kernel modules from /etc/modules.d/*
[ 301.015405] kmodloader: done loading kernel modules from /etc/modules.d/*
[ 412.115409] eth0: link down
[ 420.436666] eth0: link up (100Mbps/Full duplex)
[ 8261.925144] eth1: link down
[ 8261.931623] br-lan: port 1(eth1.1) entered disabled state
[ 8263.395831] eth0: link down
[ 8264.400144] eth1: link up (1000Mbps/Full duplex)
[ 8264.861485] eth0: link up (100Mbps/Full duplex)
[ 8265.470686] br-lan: port 1(eth1.1) entered blocking state
[ 8265.476326] br-lan: port 1(eth1.1) entered forwarding state
[ 8265.690549] eth0: link down
[ 8265.705510] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 8266.276300] eth0: link up (100Mbps/Full duplex)
[ 8266.382516] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[ 8266.501954] eth0: link down
[ 8266.510402] IPv6: ADDRCONF(NETDEV_UP): eth0: link is not ready
[ 8266.519389] eth0: link up (100Mbps/Full duplex)
[ 8266.533529] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready
[ 8290.958841] eth1: link down
[ 8290.969457] br-lan: port 1(eth1.1) entered disabled state
[ 8292.568184] eth0: link down
[ 8293.101151] eth1: link up (1000Mbps/Full duplex)
[ 8293.255377] br-lan: port 1(eth1.1) entered blocking state
[ 8293.260981] br-lan: port 1(eth1.1) entered forwarding state
[ 8293.644120] eth0: link up (100Mbps/Full duplex)
[ 8327.175339] eth1: link down
[ 8327.184519] br-lan: port 1(eth1.1) entered disabled state
[ 8328.915843] eth0: link down
[ 8330.079749] eth0: link up (100Mbps/Full duplex)
[ 8331.007824] eth1: link up (1000Mbps/Full duplex)
[ 8331.045697] br-lan: port 1(eth1.1) entered blocking state
[ 8331.051305] br-lan: port 1(eth1.1) entered forwarding state
lsmod | fgrep ath10k
ath 16832 4 ath9k,ath9k_common,ath9k_hw,ath10k_core
ath10k_core 253968 1 ath10k_pci
ath10k_pci 29968 0
cfg80211 200496 5 ath9k,ath9k_common,ath10k_core,ath,mac80211
compat 4704 5 ath9k,ath9k_common,ath10k_pci,mac80211,cfg80211
mac80211 391936 2 ath9k,ath10k_core