Thanks. I noticed the following kernel stack trace in that log: --- Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: BUG: kernel NULL pointer dereference, address: 0000000000000058 Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: #PF: supervisor read access in kernel mode Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: #PF: error_code(0x0000) - not-present page Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: PGD 0 P4D 0 Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: Oops: 0000 [#1] SMP NOPTI Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: CPU: 5 PID: 141 Comm: kworker/5:1 Tainted: G W 5.15.0-33-generic #34-Ubuntu Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: Hardware name: HP HP ENVY x360 Convertible 13-ar0xxx/85DE, BIOS F.19 12/26/2019 Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: Workqueue: events_long ucsi_init_work [typec_ucsi] Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: RIP: 0010:typec_register_altmode+0x30/0x3b0 [typec] Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: Code: 48 89 e5 41 57 41 56 41 55 49 89 f5 41 54 49 89 fc 48 8d bf 00 03 00 00 53 48 83 ec 30 65 48 8b 04 25 28 00 00 00 48 89 45 d0 <48> 8b 87 58 fd ff ff 48 3d 80 37 3c c0 74 1a 49 8d 94 24 f0 02 00 Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: RSP: 0018:ffffa7b78077fca0 EFLAGS: 00010286 Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: RAX: b2e6484fbd696500 RBX: ffff944f4324a000 RCX: 0000000000000001 Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: RDX: 0000000000000000 RSI: ffffa7b78077fd78 RDI: 0000000000000300 Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: RBP: ffffa7b78077fcf8 R08: 0000000000000000 R09: 0000000000000000 Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: R13: ffffa7b78077fd78 R14: ffffa7b78077fd78 R15: 0000000000000000 Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: FS: 0000000000000000(0000) GS:ffff9451d0b40000(0000) knlGS:0000000000000000 Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: CR2: 0000000000000058 CR3: 0000000109c20000 CR4: 00000000003506e0 Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: Call Trace: Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: ? wait_for_completion_timeout+0x1d/0x20 Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: typec_partner_register_altmode+0xe/0x10 [typec] Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: ucsi_register_altmode.constprop.0+0x1e4/0x270 [typec_ucsi] Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: ucsi_register_altmodes+0x156/0x210 [typec_ucsi] Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: ucsi_check_altmodes+0x1c/0x50 [typec_ucsi] Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: ucsi_register_port+0x4d0/0x510 [typec_ucsi] Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: ucsi_init+0xce/0x1b0 [typec_ucsi] Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: ucsi_init_work+0x16/0x30 [typec_ucsi] Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: process_one_work+0x22b/0x3d0 Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: worker_thread+0x53/0x410 Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: ? process_one_work+0x3d0/0x3d0 Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: kthread+0x12a/0x150 Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: ? set_kthread_struct+0x50/0x50 Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: ret_from_fork+0x22/0x30 Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: Modules linked in: snd_hda_codec_hdmi(+) amd64_edac(+) sunrpc(+) snd_hda_intel snd_intel_dspcfg edac_mce_amd snd_intel_sdw_acpi snd_hda_codec kvm_amd snd_hda_core iommu_v2 snd_hwdep rtw88_8822be gpu_sched kvm snd_pcm drm_ttm_helper crct10dif_pclmul rtw88_8822b ghash_clmulni_intel uvcvideo btusb ttm rtw88_pci nls_iso8859_1 btrtl aesni_intel btbcm rtw88_core videobuf2_vmalloc snd_seq_midi crypto_simd btintel snd_seq_midi_event cryptd videobuf2_memops rapl drm_kms_helper snd_rawmidi videobuf2_v4l2 bluetooth mac80211 cec input_leds videobuf2_common snd_seq rc_core videodev serio_raw ecdh_generic ecc i2c_algo_bit hp_wmi snd_seq_device efi_pstore mc platform_profile wmi_bmof sparse_keymap hid_multitouch snd_timer fb_sys_fops snd_pci_acp5x cfg80211 ucsi_acpi syscopyarea snd snd_rn_pci_acp3x typec_ucsi sysfillrect sysimgblt k10temp soundcore ccp snd_pci_acp3x libarc4 typec mac_hid hp_accel hid_sensor_magn_3d hid_sensor_gyro_3d hid_sensor_accel_3d lis3lv02d wireless_hotkey Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: hid_sensor_trigger amd_pmc industrialio_triggered_buffer kfifo_buf hid_sensor_iio_common acpi_tad industrialio sch_fq_codel ipmi_devintf ipmi_msghandler msr parport_pc ppdev drm lp parport ip_tables x_tables autofs4 rtsx_pci_sdmmc nvme hid_sensor_hub hid_generic xhci_pci crc32_pclmul i2c_piix4 amd_sfh nvme_core xhci_pci_renesas rtsx_pci wmi i2c_hid_acpi i2c_hid video hid Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: CR2: 0000000000000058 Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: ---[ end trace a8aa91e8ec7035c5 ]--- Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: RIP: 0010:typec_register_altmode+0x30/0x3b0 [typec] Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: Code: 48 89 e5 41 57 41 56 41 55 49 89 f5 41 54 49 89 fc 48 8d bf 00 03 00 00 53 48 83 ec 30 65 48 8b 04 25 28 00 00 00 48 89 45 d0 <48> 8b 87 58 fd ff ff 48 3d 80 37 3c c0 74 1a 49 8d 94 24 f0 02 00 Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: RSP: 0018:ffffa7b78077fca0 EFLAGS: 00010286 Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: RAX: b2e6484fbd696500 RBX: ffff944f4324a000 RCX: 0000000000000001 Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: RDX: 0000000000000000 RSI: ffffa7b78077fd78 RDI: 0000000000000300 Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: RBP: ffffa7b78077fcf8 R08: 0000000000000000 R09: 0000000000000000 Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: R10: 0000000000000001 R11: 0000000000000000 R12: 0000000000000000 Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: R13: ffffa7b78077fd78 R14: ffffa7b78077fd78 R15: 0000000000000000 Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: FS: 0000000000000000(0000) GS:ffff9451d0b40000(0000) knlGS:0000000000000000 Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Jun 06 15:55:28 juergen-HP-ENVY-x360-Convertible-13-ar0xxx kernel: CR2: 0000000000000058 CR3: 0000000109c20000 CR4: 00000000003506e0 --- A quick google search indicates this may be caused by [1], and a fix may be available at [2]. [1] https://