Hi everyone,
my RUTM51 disconnects several times a day.
Firmware version: RUTM_R_00.07.14.2
Firmware build date: 2025-05-07 13:13:00
Internal modem firmware version: RG500UEBAAR03A02M4G_REL
Kernel version: 5.10.234
Here are some informations from “logread”
1002 Sun May 18 08:57:36 2025 kern.warn kernel: [36014.142559] ------------[ cut here ]------------
1003 Sun May 18 08:57:36 2025 kern.warn kernel: [36014.147228] WARNING: CPU: 0 PID: 0 at net/sched/sch_generic.c:519 dev_watchdog+0x280/0x288
1004 Sun May 18 08:57:36 2025 kern.warn kernel: [36014.155504] NETDEV WATCHDOG: usb0 (cdc_ncm): transmit queue 0 timed out 6050 ms
1005 Sun May 18 08:57:36 2025 kern.warn kernel: [36014.163171] Modules linked in: xt_connlimit pppoe ppp_async option nf_conncount l2tp_ppp iptable_nat xt_state xt_nat xt_helper xt_conntrack xt_connmark xt_connbytes xt_REDIRECT xt_MASQUERADE xt_FLOWOFFLOAD xt_CT usb_wwan qmi_wwan pptp pppox ppp_mppe ppp_generic pl2303 nft_redir nft_ct nf_nat_tftp nf_nat_snmp_basic nf_nat_sip nf_nat_pptp nf_nat_irc nf_nat_h323 nf_nat_ftp nf_nat_amanda nf_nat nf_flow_table nf_conntrack_tftp nf_conntrack_snmp nf_conntrack_sip nf_conntrack_pptp nf_conntrack_netlink nf_conntrack_irc nf_conntrack_h323 nf_conntrack_ftp nf_conntrack_broadcast nf_conntrack_amanda nf_conntrack mt7615e mt7615_common mt76_connac_lib mt76 mac80211 ipt_REJECT ftdi_sio ebtable_nat ebtable_filter ebtable_broute cypress_m8 cp210x ch341 cfg80211 cdc_ncm cdc_ether belkin_sa ark3116 xt_time xt_tcpudp xt_tcpmss xt_statistic xt_recent xt_policy xt_multiport xt_mark xt_mac xt_limit xt_length xt_hl xt_hashlimit xt_esp xt_ecn xt_dscp xt_coova xt_comment xt_TCPMSS xt_NFLOG xt_LOG xt_HL xt_DSCP
1006 Sun May 18 08:57:36 2025 kern.warn kernel: [36014.163587] xt_CLASSIFY xfrm_interface wireguard usbserial usbnet ts_kmp ts_fsm ts_bm tla202X slhc sch_cake rfcomm nft_reject_ipv6 nft_reject_ipv4 nft_reject_inet nft_reject nft_quota nft_objref nft_numgen nft_log nft_limit nft_hash nft_fwd_netdev nft_dup_netdev nft_counter nfnetlink_log nf_tables nf_reject_ipv4 nf_log_ipv6 nf_log_ipv4 nf_log_common nf_dup_netdev nf_defrag_ipv6 nf_defrag_ipv4 libcurve25519_generic libcrc32c libchacha20poly1305 iptable_raw iptable_mangle iptable_filter ipt_ah ipt_ECN ip6table_raw ip_tables hwmon hidp hci_uart exfat ebtables ebt_vlan ebt_stp ebt_redirect ebt_pkttype ebt_mark_m ebt_mark ebt_limit ebt_among ebt_802_3 compat cls_flower ch343 cdc_wdm cdc_acm btusb btrtl btintel bnep bluetooth asn1_decoder pulse_counter tlt_fsb 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 hid evdev input_core tlt_gpio xt_set ip_set_list_set ip_set_hash_netportnet ip_set_hash_netport
1007 Sun May 18 08:57:36 2025 kern.warn kernel: [36014.251906] 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_ip ip_set_bitmap_port ip_set_bitmap_ipmac ip_set_bitmap_ip ip_set nfnetlink ip6table_mangle ip6table_filter ip6_tables ip6t_REJECT x_tables nf_reject_ipv6 msdos ip6_gre ip_gre gre ifb l2tp_ip6 l2tp_ip l2tp_eth l2tp_netlink l2tp_core ipcomp6 xfrm6_tunnel esp6 ah6 xfrm4_tunnel ipcomp esp4 ah4 ip6_tunnel tunnel6 tunnel4 ip_tunnel vrf tun ovpn_dco_v2 udp_tunnel ip6_udp_tunnel xfrm_user xfrm_ipcomp af_key xfrm_algo vfat fat ntfs autofs4 nls_utf8 nls_iso8859_1 nls_cp437 ecdh_generic ecc sha512_generic kpp crypto_hw_eip93 des_generic libdes cmac usb_storage spi_gpio spi_bitbang gpio_74x164 xhci_plat_hcd xhci_pci xhci_mtk xhci_hcd sd_mod scsi_mod tpm_tis_i2c gpio_button_hotplug ext4 mbcache jbd2 tpm_tis_core mii crc32c_generic
1008 Sun May 18 08:57:36 2025 kern.warn kernel: [36014.418259] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.10.234 #0
1009 Sun May 18 08:57:36 2025 kern.warn kernel: [36014.424629] Stack : 807f6c68 ffffffff 80910000 8008584c 80910000 807f7bfc 00000000 00000000
1010 Sun May 18 08:57:36 2025 kern.warn kernel: [36014.433000] 8140bdac 80a70000 8089f330 8089ee47 807c41b8 00000001 8140bd50 81b3439d
1011 Sun May 18 08:57:36 2025 kern.warn kernel: [36014.441344] 00000000 00000000 807c41b8 8140bbf0 ffffefff 8090896c 00000000 00000000
1012 Sun May 18 08:57:36 2025 kern.warn kernel: [36014.449708] 00000000 000006ff 00000000 000661d3 00000000 80910000 00000000 807c0000
1013 Sun May 18 08:57:36 2025 kern.warn kernel: [36014.458073] 00000009 000017a2 00000122 ffffffff 00000018 8041489c 00000000 80a70000
1014 Sun May 18 08:57:36 2025 kern.warn kernel: [36014.466417] ...
1015 Sun May 18 08:57:36 2025 kern.warn kernel: [36014.468857] Call Trace:
1016 Sun May 18 08:57:36 2025 kern.warn kernel: [36014.471318] [<80008108>] show_stack+0x30/0x100
1017 Sun May 18 08:57:36 2025 kern.warn kernel: [36014.475750] [<803927d4>] dump_stack+0xa4/0xe0
1018 Sun May 18 08:57:36 2025 kern.warn kernel: [36014.480108] [<800304cc>] __warn+0xb0/0xd8
1019 Sun May 18 08:57:36 2025 kern.warn kernel: [36014.484102] [<80030580>] warn_slowpath_fmt+0x8c/0xac
1020 Sun May 18 08:57:36 2025 kern.warn kernel: [36014.489067] [<80587d80>] dev_watchdog+0x280/0x288
1021 Sun May 18 08:57:36 2025 kern.warn kernel: [36014.493759] [<800a38d8>] call_timer_fn.isra.30+0x20/0x90
1022 Sun May 18 08:57:36 2025 kern.warn kernel: [36014.499049] [<800a42a8>] run_timer_softirq+0x22c/0x4d8
1023 Sun May 18 08:57:36 2025 kern.warn kernel: [36014.504168] [<8070c58c>] __do_softirq+0x16c/0x334
1024 Sun May 18 08:57:36 2025 kern.warn kernel: [36014.508856] [<800351a0>] irq_exit+0xc4/0xec
1025 Sun May 18 08:57:36 2025 kern.warn kernel: [36014.513034] [<803acf9c>] plat_irq_dispatch+0x64/0x104
1026 Sun May 18 08:57:36 2025 kern.warn kernel: [36014.518064] [<80003548>] except_vec_vi_end+0xb8/0xc4
1027 Sun May 18 08:57:36 2025 kern.warn kernel: [36014.523021] [<804d4fd0>] cpuidle_enter_state_coupled+0x3b0/0x500
1028 Sun May 18 08:57:36 2025 kern.warn kernel: [36014.529002] [<804d27f0>] cpuidle_enter+0x54/0xac
1029 Sun May 18 08:57:36 2025 kern.warn kernel: [36014.533605] [<80060860>] do_idle+0x268/0x2d8
1030 Sun May 18 08:57:36 2025 kern.warn kernel: [36014.537856] [<80060b48>] cpu_startup_entry+0x2c/0x34
1031 Sun May 18 08:57:36 2025 kern.warn kernel: [36014.542806] [<8092bd38>] start_kernel+0x590/0x5b8
1032 Sun May 18 08:57:36 2025 kern.warn kernel: [36014.547490]
1033 Sun May 18 08:57:36 2025 kern.warn kernel: [36014.549540] ---[ end trace cacfb82a50b62116 ]---
1034 Sun May 18 08:58:10 2025 kern.notice IPv4 connectivity started to fail
1035 Sun May 18 08:58:25 2025 kern.info kernel: [36063.052823] usb 2-1: USB disconnect, device number 3
1036 Sun May 18 08:58:25 2025 kern.info kernel: [36063.058021] cdc_ncm 2-1:1.0 usb0: unregister 'cdc_ncm' usb-1e1c0000.xhci-1, CDC NCM
1037 Sun May 18 08:58:25 2025 daemon.notice odhcp6c[17701]: carrier => 0 event on
1038 Sun May 18 08:58:25 2025 daemon.notice odhcp6c[17701]: (re)starting transaction on usb0
1039 Sun May 18 08:58:25 2025 daemon.notice netifd: Network device 'usb0' link is down
1040 Sun May 18 08:58:25 2025 daemon.info odhcp6c[17701]: Interface usb0 sending router solicitation message
1041 Sun May 18 08:58:25 2025 daemon.notice netifd: Interface 'mob1s1a1_4' has link connectivity loss
1042 Sun May 18 08:58:25 2025 daemon.notice netifd: Interface 'mob1s1a1_6' has link connectivity loss
1043 Sun May 18 08:58:25 2025 kern.info kernel: [36063.354002] option1 ttyUSB0: GSM modem (1-port) converter now disconnected from ttyUSB0
1044 Sun May 18 08:58:25 2025 kern.info kernel: [36063.362298] option 2-1:1.2: device disconnected
1045 Sun May 18 08:58:25 2025 kern.info kernel: [36063.367743] option1 ttyUSB1: GSM modem (1-port) converter now disconnected from ttyUSB1
1046 Sun May 18 08:58:25 2025 kern.info kernel: [36063.376117] option 2-1:1.3: device disconnected
1047 Sun May 18 08:58:25 2025 kern.info kernel: [36063.423041] option1 ttyUSB2: GSM modem (1-port) converter now disconnected from ttyUSB2
1048 Sun May 18 08:58:25 2025 kern.info kernel: [36063.431319] option 2-1:1.4: device disconnected
1049 Sun May 18 08:58:25 2025 kern.info kernel: [36063.436867] option1 ttyUSB3: GSM modem (1-port) converter now disconnected from ttyUSB3
1050 Sun May 18 08:58:25 2025 kern.info kernel: [36063.445262] option 2-1:1.5: device disconnected
1051 Sun May 18 08:58:25 2025 kern.info kernel: [36063.450616] option1 ttyUSB4: GSM modem (1-port) converter now disconnected from ttyUSB4
1052 Sun May 18 08:58:25 2025 kern.info kernel: [36063.458967] option 2-1:1.6: device disconnected
Solutions I’ve tried (all found in other topics):
- Firmware downgrade to RUTM_R_00.07.13.4_WEBUI.bin (no success)
- Prefered network type: 5G/4G/3G → 4G only (no success)
- VoLTE: Auto → Off (no success)
- Reset over bootloader (no success)
It seems that the modem firmware is buggy.
There are a lot off topics pointing in the same direction.
Need help before sending back the device.
Best regards
