Hello @ywp: Thanks for the suggestion. I can confirm that I:
- Unplugged the Raspberry Pi Zero 2 W. There is nothing connected on the USB port of the E750V2.
- 2G WiFi is off, only 5G WiFi is on.
- I'm using the official charger.
Sadly, the same problem happened again! The internal modem disconnected itself and I get the same message on the web interface dashboard saying: "No Modem device found. Plug in your USB modem to start."
I managed to copy and paste the error messages from the log (see below). However, even the web interface became unresponsive, so I didn't get a chance to export the full log before rebooting the router.
This is a very frustrating problem. Is there anyway to fix it? Or should I return this router for a refund? There are only about 10 days left for me to return it, so I need to know now.
Thanks!
Thu Aug 22 10:27:58 2024 kern.err kernel: [82290.332111] usb 1-1-port1: cannot reset (err = -71)
Thu Aug 22 10:27:58 2024 kern.err kernel: [82290.366114] usb 1-1-port1: cannot reset (err = -71)
Thu Aug 22 10:27:58 2024 kern.err kernel: [82290.400103] usb 1-1-port1: cannot reset (err = -71)
Thu Aug 22 10:27:58 2024 kern.err kernel: [82290.434625] usb 1-1-port1: cannot reset (err = -71)
Thu Aug 22 10:27:58 2024 kern.err kernel: [82290.471110] usb 1-1-port1: cannot reset (err = -71)
Thu Aug 22 10:27:58 2024 kern.err kernel: [82290.471130] usb 1-1-port1: Cannot enable. Maybe the USB cable is bad?
Thu Aug 22 10:27:58 2024 kern.err kernel: [82290.505096] usb 1-1-port1: cannot disable (err = -71)
Thu Aug 22 10:27:58 2024 kern.err kernel: [82290.539096] usb 1-1-port1: cannot reset (err = -71)
Thu Aug 22 10:27:58 2024 kern.err kernel: [82290.576113] usb 1-1-port1: cannot reset (err = -71)
Thu Aug 22 10:27:58 2024 kern.err kernel: [82290.610153] usb 1-1-port1: cannot reset (err = -71)
Thu Aug 22 10:27:58 2024 kern.err kernel: [82290.644102] usb 1-1-port1: cannot reset (err = -71)
Thu Aug 22 10:27:58 2024 kern.err kernel: [82290.678103] usb 1-1-port1: cannot reset (err = -71)
Thu Aug 22 10:27:58 2024 kern.err kernel: [82290.678123] usb 1-1-port1: Cannot enable. Maybe the USB cable is bad?
Thu Aug 22 10:27:58 2024 kern.err kernel: [82290.712104] usb 1-1-port1: cannot disable (err = -71)
Thu Aug 22 10:27:58 2024 kern.err kernel: [82290.745106] usb 1-1-port1: cannot reset (err = -71)
Thu Aug 22 10:27:58 2024 kern.err kernel: [82290.779104] usb 1-1-port1: cannot reset (err = -71)
Thu Aug 22 10:27:58 2024 kern.err kernel: [82290.819092] usb 1-1-port1: cannot reset (err = -71)
Thu Aug 22 10:27:58 2024 kern.err kernel: [82290.854113] usb 1-1-port1: cannot reset (err = -71)
Thu Aug 22 10:27:58 2024 kern.err kernel: [82290.889100] usb 1-1-port1: cannot reset (err = -71)
Thu Aug 22 10:27:58 2024 kern.err kernel: [82290.889120] usb 1-1-port1: Cannot enable. Maybe the USB cable is bad?
Thu Aug 22 10:27:58 2024 kern.err kernel: [82290.923086] usb 1-1-port1: cannot disable (err = -71)
Thu Aug 22 10:27:59 2024 kern.err kernel: [82290.956108] usb 1-1-port1: cannot reset (err = -71)
Thu Aug 22 10:27:59 2024 kern.err kernel: [82290.990109] usb 1-1-port1: cannot reset (err = -71)
Thu Aug 22 10:27:59 2024 kern.err kernel: [82291.025100] usb 1-1-port1: cannot reset (err = -71)
Thu Aug 22 10:27:59 2024 kern.err kernel: [82291.058108] usb 1-1-port1: cannot reset (err = -71)
Thu Aug 22 10:27:59 2024 kern.err kernel: [82291.093109] usb 1-1-port1: cannot reset (err = -71)
Thu Aug 22 10:27:59 2024 kern.err kernel: [82291.093129] usb 1-1-port1: Cannot enable. Maybe the USB cable is bad?
Thu Aug 22 10:27:59 2024 kern.err kernel: [82291.127111] usb 1-1-port1: cannot disable (err = -71)
Thu Aug 22 10:27:59 2024 kern.err kernel: [82291.163100] usb 1-1-port1: cannot disable (err = -71)
Thu Aug 22 10:27:59 2024 kern.err kernel: [82291.197111] hub 1-1:1.0: hub_ext_port_status failed (err = -71)
Thu Aug 22 10:28:10 2024 kern.warn kernel: [82302.829650] ------------[ cut here ]------------
Thu Aug 22 10:28:10 2024 kern.warn kernel: [82302.829708] WARNING: CPU: 0 PID: 0 at net/sched/sch_generic.c:467 dev_watchdog+0x26c/0x274
Thu Aug 22 10:28:10 2024 kern.info kernel: [82302.829715] NETDEV WATCHDOG: wwan0 (qmi_wwan): transmit queue 0 timed out
Thu Aug 22 10:28:10 2024 kern.warn kernel: [82302.829719] Modules linked in: shortcut_fe_cm ath9k ath9k_common pppoe ppp_async option ath9k_hw ath10k_pci ath10k_core ath usb_wwan rndis_host qmi_wwan pppox ppp_generic nft_fib_inet nf_flow_table_ipv6 nf_flow_table_ipv4 nf_flow_table_inet mac80211 ipt_REJECT huawei_cdc_ncm cfg80211 cdc_ncm cdc_ether xt_time xt_tcpudp xt_tcpmss xt_string xt_statistic xt_state xt_recent xt_quota xt_pkttype xt_owner xt_nat xt_multiport xt_mark xt_mac xt_limit xt_length xt_hl xt_helper xt_ecn xt_dscp xt_conntrack xt_connmark xt_connlimit xt_connbytes xt_comment xt_cgroup xt_bpf xt_addrtype xt_TPROXY xt_TCPMSS xt_REDIRECT xt_MASQUERADE xt_LOG xt_HL xt_DSCP xt_CT xt_CLASSIFY wireguard usbserial usbnet ts_kmp ts_fsm ts_bm slhc nft_reject_ipv6 nft_reject_ipv4 nft_reject_inet nft_reject nft_redir nft_quota nft_objref nft_numgen nft_nat nft_masq nft_log nft_limit nft_hash nft_flow_offload nft_fib_ipv6 nft_fib_ipv4 nft_fib nft_ct nft_counter nft_compat nft_chain_nat nf_tproxy_ipv6 nf_tproxy_ipv4 nf_tables
Thu Aug 22 10:28:10 2024 kern.warn kernel: [82302.830099] nf_reject_ipv4 nf_log_ipv6 nf_log_ipv4 nf_log_common nf_flow_table nf_conntrack_netlink nf_conncount libcrc32c iptable_raw iptable_nat iptable_mangle iptable_filter ipt_ECN ipheth ip_tables crc_ccitt compat cdc_wdm cdc_acm br_netfilter arptable_filter arpt_mangle arp_tables fuse sch_tbf sch_ingress sch_htb sch_hfsc em_u32 cls_u32 cls_route cls_matchall cls_fw cls_flow cls_basic act_skbedit act_mirred act_gact xt_set ip_set_list_set ip_set_hash_netportnet ip_set_hash_netport ip_set_hash_netnet ip_set_hash_netiface ip_set_hash_net ip_set_hash_mac ip_set_hash_ipportnet ip_set_hash_ipportip ip_set_hash_ipport ip_set_hash_ipmark ip_set_hash_ipmac ip_set_hash_ip ip_set_bitmap_port ip_set_bitmap_ipmac ip_set_bitmap_ip ip_set nfnetlink ip6table_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 ip6t_NPT ip6table_mangle ip6table_filter ip6_tables ip6t_REJECT x_tables nf_reject_ipv6 ifb ip6_udp_tunnel udp_tunnel udp_diag tcp_diag raw_diag inet_diag tun vfat fat ntfs nls_utf8
Thu Aug 22 10:28:10 2024 kern.warn kernel: [82302.830417] nls_iso8859_1 nls_cp437 shortcut_fe_ipv6 shortcut_fe sha256_generic libsha256 seqiv jitterentropy_rng drbg hmac cmac mtdoops usb_storage uhci_hcd ohci_platform ohci_hcd fsl_mph_dr_of ehci_platform ehci_fsl sd_mod scsi_mod ehci_hcd gpio_button_hotplug gl_sdk4_tertf ext4 mbcache jbd2 exfat phy_ar7100_usb usbcore nls_base usb_common mii crc32c_generic gl_sdk4_hw_info
Thu Aug 22 10:28:10 2024 kern.warn kernel: [82302.830569] CPU: 0 PID: 0 Comm: swapper Not tainted 5.10.176 #0
Thu Aug 22 10:28:10 2024 kern.warn kernel: [82302.830576] Stack : 80870000 8076ebd8 00000000 00000000 80c09dd4 809b0000 80800000 8073cd58
Thu Aug 22 10:28:10 2024 kern.warn kernel: [82302.830613] 807fa288 807f9e47 809b32d0 00000000 00000000 00000001 80c09d88 38c63493
Thu Aug 22 10:28:10 2024 kern.warn kernel: [82302.830649] 00000000 00000000 8073cd58 80c09c28 ffffefff 00000000 00000000 ffffffea
Thu Aug 22 10:28:10 2024 kern.warn kernel: [82302.830684] 0000017d 80c09c34 0000017d 807ffb48 00000000 00000009 80c09e68 805367e0
Thu Aug 22 10:28:10 2024 kern.warn kernel: [82302.830720] 00000009 00000000 007d2071 80869cf4 00000003 00000038 00000000 809b0000
Thu Aug 22 10:28:10 2024 kern.warn kernel: [82302.830755] ...
Thu Aug 22 10:28:10 2024 kern.warn kernel: [82302.830766] Call Trace:
Thu Aug 22 10:28:10 2024 kern.warn kernel: [82302.830796] [<80066ea4>] show_stack+0x30/0x100
Thu Aug 22 10:28:10 2024 kern.warn kernel: [82302.830815] [<80085b54>] __warn+0xb0/0x11c
Thu Aug 22 10:28:10 2024 kern.warn kernel: [82302.830827] [<80085c4c>] warn_slowpath_fmt+0x8c/0xac
Thu Aug 22 10:28:10 2024 kern.warn kernel: [82302.830844] [<805367e0>] dev_watchdog+0x26c/0x274
Thu Aug 22 10:28:10 2024 kern.warn kernel: [82302.830873] [<800d09a4>] call_timer_fn.constprop.0+0x1c/0x8c
Thu Aug 22 10:28:10 2024 kern.warn kernel: [82302.830886] [<800d0ce0>] run_timer_softirq+0x2cc/0x364
Thu Aug 22 10:28:10 2024 kern.warn kernel: [82302.830918] [<8069f770>] __do_softirq+0x118/0x2ec
Thu Aug 22 10:28:10 2024 kern.warn kernel: [82302.830939] [<8039dd50>] plat_irq_dispatch+0x94/0xc8
Thu Aug 22 10:28:10 2024 kern.warn kernel: [82302.830954] [<800625d8>] handle_int+0x138/0x144
Thu Aug 22 10:28:10 2024 kern.warn kernel: [82302.830965] [<80062460>] __r4k_wait+0x20/0x40
Thu Aug 22 10:28:10 2024 kern.warn kernel: [82302.830972]
Thu Aug 22 10:28:10 2024 kern.warn kernel: [82302.830979] ---[ end trace 062b719ee8f8b513 ]---
Thu Aug 22 10:28:38 2024 user.notice mwan3[27759]: Execute ifdown event on interface modem_1_1_2 (wwan0)
Thu Aug 22 10:28:41 2024 user.notice firewall: Reloading firewall due to ifdown of modem_1_1_2 (wwan0)
Thu Aug 22 10:28:44 2024 user.info mwan3track[7574]: Detect ifdown event on interface modem_1_1_2 (wwan0)
Thu Aug 22 10:28:50 2024 user.notice mwan3track[7574]: Interface modem_1_1_2 (wwan0) is offline
Thu Aug 22 10:28:52 2024 daemon.err glc: (common.c:1280) SMS set failed
Thu Aug 22 10:31:33 2024 daemon.err glc: (common.c:1280) SMS set failed