Hi ! I want to use LM842 USB stick on a Raspberry Pi 4 using Raspberry Pi OS (64-bit Debian Bookworm with kernel 6.6.20), but the driver get stucked. The LM842 on Raspi is used as AP. Here I show how I created the AP: sudo nmcli con add type wifi ifname wlan1 mode ap con-name TEST-AP ssid TEST autoconnect false sudo nmcli con modify TEST-AP 802-11-wireless.band bg sudo nmcli con modify TEST-AP 802-11-wireless.channel 6 sudo nmcli con modify TEST-AP 802-11-wireless.cloned-mac-address 00:12:34:56:78:9a sudo nmcli con modify TEST-AP ipv4.method shared ipv4.address 192.168.244.1/24 sudo nmcli con modify TEST-AP ipv6.method disabled sudo nmcli con modify TEST-AP wifi-sec.key-mgmt wpa-psk sudo nmcli con modify TEST-AP wifi-sec.psk "mypassword" sudo nmcli con up TEST-AP Here is the kernel log with 2 kernel traces: ============plug-in LM842 USB stick =========== Apr 12 14:36:33 lite-61 kernel: usb 1-1.3: new high-speed USB device number 3 using xhci_hcd Apr 12 14:36:33 lite-61 kernel: usb 1-1.3: New USB device found, idVendor=0bda, idProduct=c82c, bcdDevice= 0.00 Apr 12 14:36:33 lite-61 kernel: usb 1-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=3 Apr 12 14:36:33 lite-61 kernel: usb 1-1.3: Product: 802.11ac NIC Apr 12 14:36:33 lite-61 kernel: usb 1-1.3: Manufacturer: Realtek Apr 12 14:36:33 lite-61 kernel: usb 1-1.3: SerialNumber: 123456 Apr 12 14:36:33 lite-61 kernel: usbcore: registered new interface driver btusb Apr 12 14:36:33 lite-61 kernel: Bluetooth: hci1: RTL: examining hci_ver=0a hci_rev=000c lmp_ver=0a lmp_subver=8822 Apr 12 14:36:33 lite-61 kernel: Bluetooth: hci1: RTL: rom_version status=0 version=3 Apr 12 14:36:33 lite-61 kernel: Bluetooth: hci1: RTL: loading rtl_bt/rtl8822cu_fw.bin Apr 12 14:36:33 lite-61 kernel: Bluetooth: hci1: RTL: loading rtl_bt/rtl8822cu_config.bin Apr 12 14:36:33 lite-61 kernel: Bluetooth: hci1: RTL: cfg_sz 6, total sz 35990 Apr 12 14:36:33 lite-61 kernel: rtw_8822cu 1-1.3:1.2: WOW Firmware version 9.9.4, H2C version 15 Apr 12 14:36:33 lite-61 kernel: rtw_8822cu 1-1.3:1.2: Firmware version 9.9.15, H2C version 15 Apr 12 14:36:34 lite-61 kernel: Bluetooth: hci1: RTL: fw version 0x0cc6d2e3 Apr 12 14:36:34 lite-61 kernel: Bluetooth: MGMT ver 1.22 Apr 12 14:36:34 lite-61 kernel: usbcore: registered new interface driver rtw_8822cu ===========AP is started, client connect to AP=============================================================== ===========send some test data with iperf3 30-45 min (UDP/TCP test data)===================================== ===========iperf3 -c 192.168.244.1 -u -i 1 -t 600 -O 5 || iperf3 -c 192.168.244.1 -i 1 -t 600 -O 5========== Apr 12 14:41:01 lite-61 kernel: rtw_8822cu 1-1.3:1.2: timed out to flush queue 3 Apr 12 14:41:01 lite-61 kernel: rtw_8822cu 1-1.3:1.2: timed out to flush queue 3 Apr 12 14:57:04 lite-61 kernel: rtw_8822cu 1-1.3:1.2: timed out to flush queue 3 Apr 12 14:57:04 lite-61 kernel: rtw_8822cu 1-1.3:1.2: timed out to flush queue 3 Apr 12 14:57:15 lite-61 kernel: rtw_8822cu 1-1.3:1.2: timed out to flush queue 3 Apr 12 15:07:15 lite-61 kernel: rtw_8822cu 1-1.3:1.2: timed out to flush queue 3 =========here it get stalled : the connection is broken========= =========AP is not anymore visible============================== Apr 12 15:17:19 lite-61 kernel: rtw_8822cu 1-1.3:1.2: timed out to flush queue 3 Apr 12 15:17:19 lite-61 kernel: rtw_8822cu 1-1.3:1.2: timed out to flush queue 3 Apr 12 15:17:21 lite-61 kernel: rtw_8822cu 1-1.3:1.2: timed out to flush queue 3 Apr 12 15:17:24 lite-61 kernel: rtw_8822cu 1-1.3:1.2: error beacon valid Apr 12 15:17:24 lite-61 kernel: rtw_8822cu 1-1.3:1.2: failed to download drv rsvd page =============shut down AP in Raspi(sudo nmcli con down TEST-AP)=========== Apr 12 15:23:47 lite-61 kernel: rtw_8822cu 1-1.3:1.2: timed out to flush queue 3 Apr 12 15:23:47 lite-61 kernel: rtw_8822cu 1-1.3:1.2: timed out to flush queue 3 Apr 12 15:23:47 lite-61 kernel: rtw_8822cu 1-1.3:1.2: timed out to flush queue 3 Apr 12 15:23:47 lite-61 kernel: rtw_8822cu 1-1.3:1.2: error beacon valid Apr 12 15:23:47 lite-61 kernel: rtw_8822cu 1-1.3:1.2: failed to download rsvd page Apr 12 15:23:47 lite-61 kernel: rtw_8822cu 1-1.3:1.2: failed to download firmware Apr 12 15:23:47 lite-61 kernel: rtw_8822cu 1-1.3:1.2: leave idle state failed Apr 12 15:23:47 lite-61 kernel: rtw_8822cu 1-1.3:1.2: failed to send h2c command Apr 12 15:23:47 lite-61 kernel: rtw_8822cu 1-1.3:1.2: failed to send h2c command Apr 12 15:23:47 lite-61 kernel: rtw_8822cu 1-1.3:1.2: failed to send h2c command Apr 12 15:23:47 lite-61 kernel: rtw_8822cu 1-1.3:1.2: failed to leave ips state Apr 12 15:23:47 lite-61 kernel: rtw_8822cu 1-1.3:1.2: failed to leave idle state Apr 12 15:23:47 lite-61 kernel: ------------[ cut here ]------------ Apr 12 15:23:47 lite-61 kernel: WARNING: CPU: 0 PID: 513 at net/wireless/core.c:1518 cfg80211_netdev_notifier_call+0x3a4/0x558 [cfg80211] Apr 12 15:23:47 lite-61 kernel: Modules linked in: ctr ccm nft_reject_ipv4 nf_reject_ipv4 nft_reject nft_ct nft_masq nft_chain_nat nf_tables nfnetlink nf_nat_h323 nf_conntrack_h323 nf_nat_pptp nf_conntrack_pptp nf_nat_tftp nf_conntrack_tftp nf_nat_sip nf_conntrack_sip nf_nat_irc nf_conntrack_irc nf_nat_ftp nf_conntrack_ftp nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 rtw88_8822cu rtw88_8822c rtw88_usb rtw88_core mac80211 btusb btrtl btintel libarc4 cmac algif_hash aes_arm64 aes_generic algif_skcipher af_alg bnep brcmfmac_wcc brcmfmac brcmutil cfg80211 hci_uart btbcm bluetooth vc4 v3d gpu_sched drm_shmem_helper snd_soc_hdmi_codec raspberrypi_hwmon drm_display_helper ecdh_generic cec ecc drm_dma_helper rpivid_hevc(C) bcm2835_v4l2(C) bcm2835_codec(C) bcm2835_isp(C) binfmt_misc drm_kms_helper rfkill bcm2835_mmal_vchiq(C) v4l2_mem2mem snd_soc_core videobuf2_vmalloc libaes videobuf2_dma_contig videobuf2_memops videobuf2_v4l2 snd_compress videodev snd_pcm_dmaengine snd_bcm2835(C) snd_pcm videobuf2_common vc_sm_cma(C) mc raspberrypi_gpiomem Apr 12 15:23:47 lite-61 kernel: snd_timer snd nvmem_rmem uio_pdrv_genirq uio drm fuse dm_mod drm_panel_orientation_quirks backlight ip_tables x_tables ipv6 i2c_brcmstb Apr 12 15:23:47 lite-61 kernel: CPU: 0 PID: 513 Comm: NetworkManager Tainted: G C 6.6.20+rpt-rpi-v8 #1 Debian 1:6.6.20-1+rpt1 Apr 12 15:23:47 lite-61 kernel: Hardware name: Raspberry Pi 4 Model B Rev 1.5 (DT) Apr 12 15:23:47 lite-61 kernel: pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) Apr 12 15:23:47 lite-61 kernel: pc : cfg80211_netdev_notifier_call+0x3a4/0x558 [cfg80211] Apr 12 15:23:47 lite-61 kernel: lr : cfg80211_netdev_notifier_call+0x230/0x558 [cfg80211] Apr 12 15:23:47 lite-61 kernel: sp : ffffffc080ba32e0 Apr 12 15:23:47 lite-61 kernel: x29: ffffffc080ba32e0 x28: ffffffec109ec868 x27: ffffffec10974300 Apr 12 15:23:47 lite-61 kernel: x26: ffffffec8b22d850 x25: ffffffec8ae94008 x24: ffffffc080ba35c0 Apr 12 15:23:47 lite-61 kernel: x23: 0000000000000002 x22: ffffff8036be0000 x21: ffffff8036be03c0 Apr 12 15:23:47 lite-61 kernel: x20: ffffff8034ca8000 x19: ffffff8034ca8950 x18: 0000000000000000 Apr 12 15:23:47 lite-61 kernel: x17: ffffff93b02ba000 x16: ffffffec8a8fd448 x15: 0000000000070014 Apr 12 15:23:47 lite-61 kernel: x14: ffffffec8b54ef60 x13: 0000000000000010 x12: 0000001000001780 Apr 12 15:23:47 lite-61 kernel: x11: 0000000000000000 x10: 0000000000000000 x9 : ffffffec10974530 Apr 12 15:23:47 lite-61 kernel: x8 : ffffffc080ba32c8 x7 : ffffff80051d0000 x6 : 0000000000000000 Apr 12 15:23:47 lite-61 kernel: x5 : 0000000000000080 x4 : 0000000000000000 x3 : 0000000000000000 Apr 12 15:23:47 lite-61 kernel: x2 : ffffff8004049ec0 x1 : ffffff8034ca8950 x0 : 0000000000000000 Apr 12 15:23:47 lite-61 kernel: Call trace: Apr 12 15:23:47 lite-61 kernel: cfg80211_netdev_notifier_call+0x3a4/0x558 [cfg80211] Apr 12 15:23:47 lite-61 kernel: notifier_call_chain+0x78/0x148 Apr 12 15:23:47 lite-61 kernel: raw_notifier_call_chain+0x20/0x38 Apr 12 15:23:47 lite-61 kernel: call_netdevice_notifiers_info+0x60/0xb8 Apr 12 15:23:47 lite-61 kernel: __dev_notify_flags+0xbc/0xf0 Apr 12 15:23:47 lite-61 kernel: dev_change_flags+0x5c/0x80 Apr 12 15:23:47 lite-61 kernel: do_setlink+0x28c/0xef8 Apr 12 15:23:47 lite-61 kernel: __rtnl_newlink+0x520/0x898 Apr 12 15:23:47 lite-61 kernel: rtnl_newlink+0x58/0x90 Apr 12 15:23:47 lite-61 kernel: rtnetlink_rcv_msg+0x134/0x390 Apr 12 15:23:47 lite-61 kernel: netlink_rcv_skb+0x64/0x138 Apr 12 15:23:47 lite-61 kernel: rtnetlink_rcv+0x20/0x38 Apr 12 15:23:47 lite-61 kernel: netlink_unicast+0x2fc/0x370 Apr 12 15:23:47 lite-61 kernel: netlink_sendmsg+0x1c4/0x448 Apr 12 15:23:47 lite-61 kernel: __sock_sendmsg+0x64/0xc0 Apr 12 15:23:47 lite-61 kernel: ____sys_sendmsg+0x260/0x298 Apr 12 15:23:47 lite-61 kernel: ___sys_sendmsg+0xb4/0x110 Apr 12 15:23:47 lite-61 kernel: __sys_sendmsg+0x8c/0xf0 Apr 12 15:23:47 lite-61 kernel: __arm64_sys_sendmsg+0x2c/0x40 Apr 12 15:23:47 lite-61 kernel: invoke_syscall+0x50/0x128 Apr 12 15:23:47 lite-61 kernel: el0_svc_common.constprop.0+0x48/0xf0 Apr 12 15:23:47 lite-61 kernel: do_el0_svc+0x24/0x38 Apr 12 15:23:47 lite-61 kernel: el0_svc+0x40/0xe8 Apr 12 15:23:47 lite-61 kernel: el0t_64_sync_handler+0x100/0x130 Apr 12 15:23:47 lite-61 kernel: el0t_64_sync+0x190/0x198 Apr 12 15:23:47 lite-61 kernel: ---[ end trace 0000000000000000 ]--- Apr 12 15:23:47 lite-61 kernel: rtw_8822cu 1-1.3:1.2: error beacon valid Apr 12 15:23:47 lite-61 kernel: rtw_8822cu 1-1.3:1.2: failed to download rsvd page Apr 12 15:23:47 lite-61 kernel: rtw_8822cu 1-1.3:1.2: failed to download firmware Apr 12 15:23:48 lite-61 kernel: warning: `iwconfig' uses wireless extensions which will stop working for Wi-Fi 7 hardware; use nl80211 =============plug-out LM842 USB stick =========== Apr 12 15:25:09 lite-61 kernel: usb 1-1.3: USB disconnect, device number 3 Apr 12 15:25:09 lite-61 kernel: ------------[ cut here ]------------ Apr 12 15:25:09 lite-61 kernel: Have pending ack frames! Apr 12 15:25:09 lite-61 kernel: WARNING: CPU: 0 PID: 3332 at net/mac80211/main.c:1510 ieee80211_free_ack_frame+0x5c/0x88 [mac80211] Apr 12 15:25:09 lite-61 kernel: Modules linked in: ctr ccm nft_reject_ipv4 nf_reject_ipv4 nft_reject nft_ct nft_masq nft_chain_nat nf_tables nfnetlink nf_nat_h323 nf_conntrack_h323 nf_nat_pptp nf_conntrack_pptp nf_nat_tftp nf_conntrack_tftp nf_nat_sip nf_conntrack_sip nf_nat_irc nf_conntrack_irc nf_nat_ftp nf_conntrack_ftp nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 rtw88_8822cu rtw88_8822c rtw88_usb rtw88_core mac80211 btusb btrtl btintel libarc4 cmac algif_hash aes_arm64 aes_generic algif_skcipher af_alg bnep brcmfmac_wcc brcmfmac brcmutil cfg80211 hci_uart btbcm bluetooth vc4 v3d gpu_sched drm_shmem_helper snd_soc_hdmi_codec raspberrypi_hwmon drm_display_helper ecdh_generic cec ecc drm_dma_helper rpivid_hevc(C) bcm2835_v4l2(C) bcm2835_codec(C) bcm2835_isp(C) binfmt_misc drm_kms_helper rfkill bcm2835_mmal_vchiq(C) v4l2_mem2mem snd_soc_core videobuf2_vmalloc libaes videobuf2_dma_contig videobuf2_memops videobuf2_v4l2 snd_compress videodev snd_pcm_dmaengine snd_bcm2835(C) snd_pcm videobuf2_common vc_sm_cma(C) mc raspberrypi_gpiomem Apr 12 15:25:09 lite-61 kernel: snd_timer snd nvmem_rmem uio_pdrv_genirq uio drm fuse dm_mod drm_panel_orientation_quirks backlight ip_tables x_tables ipv6 i2c_brcmstb Apr 12 15:25:09 lite-61 kernel: CPU: 0 PID: 3332 Comm: kworker/0:1 Tainted: G WC 6.6.20+rpt-rpi-v8 #1 Debian 1:6.6.20-1+rpt1 Apr 12 15:25:09 lite-61 kernel: Hardware name: Raspberry Pi 4 Model B Rev 1.5 (DT) Apr 12 15:25:09 lite-61 kernel: Workqueue: usb_hub_wq hub_event Apr 12 15:25:09 lite-61 kernel: pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) Apr 12 15:25:09 lite-61 kernel: pc : ieee80211_free_ack_frame+0x5c/0x88 [mac80211] Apr 12 15:25:09 lite-61 kernel: lr : ieee80211_free_ack_frame+0x5c/0x88 [mac80211] Apr 12 15:25:09 lite-61 kernel: sp : ffffffc0872bb910 Apr 12 15:25:09 lite-61 kernel: x29: ffffffc0872bb910 x28: 0000000000000002 x27: ffffff80027fe000 Apr 12 15:25:09 lite-61 kernel: x26: ffffff800315f000 x25: ffffff800315f0a8 x24: ffffff8036be1fa0 Apr 12 15:25:09 lite-61 kernel: x23: 0000000000000000 x22: 000000007fffffff x21: ffffffec10b2e480 Apr 12 15:25:09 lite-61 kernel: x20: 0000000000000000 x19: ffffff80047d5f00 x18: ffffffc080d2bc78 Apr 12 15:25:09 lite-61 kernel: x17: ffffffec8b382740 x16: ffffffec89c8efa0 x15: 0000000000000040 Apr 12 15:25:09 lite-61 kernel: x14: ffffff8036be1fa0 x13: 2173656d61726620 x12: 6b636120676e6964 Apr 12 15:25:09 lite-61 kernel: x11: fffffffffffe0000 x10: ffffffec8b2a3708 x9 : ffffffec89d0946c Apr 12 15:25:09 lite-61 kernel: x8 : 00000000ffffefff x7 : ffffffec8b2a3708 x6 : 80000000fffff000 Apr 12 15:25:09 lite-61 kernel: x5 : ffffff803b150d48 x4 : 0000000000000000 x3 : 0000000000000027 Apr 12 15:25:09 lite-61 kernel: x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffffff8002f8dc40 Apr 12 15:25:09 lite-61 kernel: Call trace: Apr 12 15:25:09 lite-61 kernel: ieee80211_free_ack_frame+0x5c/0x88 [mac80211] Apr 12 15:25:09 lite-61 kernel: idr_for_each+0x6c/0xf0 Apr 12 15:25:09 lite-61 kernel: ieee80211_free_hw+0x48/0xc0 [mac80211] Apr 12 15:25:09 lite-61 kernel: rtw_usb_disconnect+0xc4/0x108 [rtw88_usb] Apr 12 15:25:09 lite-61 kernel: usb_unbind_interface+0x80/0x278 Apr 12 15:25:09 lite-61 kernel: device_remove+0x78/0x90 Apr 12 15:25:09 lite-61 kernel: device_release_driver_internal+0x1dc/0x238 Apr 12 15:25:09 lite-61 kernel: device_release_driver+0x20/0x38 Apr 12 15:25:09 lite-61 kernel: bus_remove_device+0xd4/0x120 Apr 12 15:25:09 lite-61 kernel: device_del+0x164/0x430 Apr 12 15:25:09 lite-61 kernel: usb_disable_device+0xdc/0x1c0 Apr 12 15:25:09 lite-61 kernel: usb_disconnect+0xe0/0x2b8 Apr 12 15:25:09 lite-61 kernel: hub_event+0x970/0x1540 Apr 12 15:25:09 lite-61 kernel: process_one_work+0x148/0x3b8 Apr 12 15:25:09 lite-61 kernel: worker_thread+0x32c/0x450 Apr 12 15:25:09 lite-61 kernel: kthread+0x11c/0x128 Apr 12 15:25:09 lite-61 kernel: ret_from_fork+0x10/0x20 Apr 12 15:25:09 lite-61 kernel: ---[ end trace 0000000000000000 ]--- The last kernel trace happens even if I don't send any data. Only plug-in the stick , connect to AP, wait some minutes, disconnect from AP and plug-out LM842. Any ideas what might be the cause of this ? Regards, Gabriel
