With kernel version 5.6.0-1048-oem, the stack trace looks different, but the problem is still present.
[ 4881.023648] ------------[ cut here ]------------ [ 4881.023782] WARNING: CPU: 1 PID: 1113 at drivers/gpu/drm/amd/amdgpu/../display/dc/dcn20/dcn20_hwseq.c:1555 dcn20_program_front_end_for_ctx+0x574/0x580 [amdgpu] [ 4881.023783] Modules linked in: bnep snd_hda_codec_realtek snd_hda_codec_generic snd_hda_codec_hdmi nls_iso8859_1 snd_hda_intel snd_intel_dspcfg soundwire_intel soundwire_generic_allocation soundwire_cadence snd_hda_codec snd_soc_dmic snd_acp3x_rn snd_hda_core snd_acp3x_pdm_dma soundwire_bus tps6598x snd_soc_core snd_compress ac97_bus iwlmvm snd_pcm_dmaengine btusb edac_mce_amd snd_usb_audio btrtl btbcm snd_seq_midi snd_usbmidi_lib btintel kvm_amd mac80211 snd_seq_midi_event joydev snd_hwdep kvm serio_raw input_leds bluetooth libarc4 snd_rawmidi cdc_ether uvcvideo usbnet snd_pcm snd_seq wmi_bmof ecdh_generic videobuf2_vmalloc r8152 videobuf2_memops ecc videobuf2_v4l2 mii videobuf2_common videodev mc thinkpad_acpi ccp iwlwifi snd_seq_device nvram snd_timer snd_rn_pci_acp3x ledtrig_audio snd_pci_acp3x cfg80211 snd ipmi_devintf ipmi_msghandler ucsi_acpi soundcore typec_ucsi i2c_multi_instantiate typec mac_hid sch_fq_codel parport_pc ppdev lp parport ip_tables x_tables autofs4 hid_generic [ 4881.023814] usbhid hid dm_crypt amdgpu rtsx_pci_sdmmc amd_iommu_v2 crct10dif_pclmul gpu_sched i2c_algo_bit crc32_pclmul ghash_clmulni_intel ttm aesni_intel drm_kms_helper crypto_simd cryptd syscopyarea glue_helper sysfillrect sysimgblt fb_sys_fops cec psmouse rc_core i2c_piix4 drm nvme r8169 rtsx_pci nvme_core realtek wmi video i2c_scmi [ 4881.023834] CPU: 1 PID: 1113 Comm: Xorg Tainted: G W 5.6.0-1048-oem #52-Ubuntu [ 4881.023835] Hardware name: LENOVO 20UH001AGE/20UH001AGE, BIOS R1CET61W(1.30 ) 12/21/2020 [ 4881.023951] RIP: 0010:dcn20_program_front_end_for_ctx+0x574/0x580 [amdgpu] [ 4881.023953] Code: c0 74 cb 4c 89 e2 48 89 df e8 f8 36 dd fa eb be 49 8b 45 00 8b 90 e4 01 00 00 85 d2 75 d5 8b 86 4c 04 00 00 85 c0 75 cb eb a4 <0f> 0b e9 14 fb ff ff 0f 1f 44 00 00 0f 1f 44 00 00 55 48 89 e5 41 [ 4881.023954] RSP: 0018:ffffc087019c7810 EFLAGS: 00010202 [ 4881.023956] RAX: ffffa07c6bec5c00 RBX: ffffa07c6bf50000 RCX: 0000000000000008 [ 4881.023957] RDX: 0000000000000001 RSI: ffffa07bd83e0000 RDI: ffffa07c6bf50000 [ 4881.023958] RBP: ffffc087019c7848 R08: 0000000000000001 R09: 0000000000000000 [ 4881.023959] R10: 0000000000000001 R11: 0000000000000004 R12: ffffa07bd83e0000 [ 4881.023960] R13: ffffa07bd83e01b8 R14: ffffa07bd83e01b8 R15: 0000000000000000 [ 4881.023962] FS: 00007f5369b0ca40(0000) GS:ffffa07c7f840000(0000) knlGS:0000000000000000 [ 4881.023963] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 4881.023964] CR2: 000055bf4e2329c8 CR3: 00000003f6eb2000 CR4: 0000000000340ee0 [ 4881.023965] Call Trace: [ 4881.024076] dc_commit_state_no_check+0x2cd/0x8a0 [amdgpu] [ 4881.024177] dc_commit_state+0x96/0xb0 [amdgpu] [ 4881.024287] amdgpu_dm_atomic_commit_tail+0x344/0x11d0 [amdgpu] [ 4881.024387] ? amdgpu_cgs_read_register+0x14/0x20 [amdgpu] [ 4881.024484] ? dm_read_reg_func+0x40/0xc0 [amdgpu] [ 4881.024576] ? generic_reg_get+0x22/0x40 [amdgpu] [ 4881.024582] ? _cond_resched+0x19/0x30 [ 4881.024658] ? amdgpu_bo_pin_restricted+0x64/0x2b0 [amdgpu] [ 4881.024665] ? ttm_bo_move_to_lru_tail+0x2d/0xc0 [ttm] [ 4881.024668] ? ww_mutex_unlock+0x26/0x30 [ 4881.024673] ? ttm_eu_backoff_reservation+0x49/0x70 [ttm] [ 4881.024748] ? amdgpu_bo_gpu_offset+0x23/0xa0 [amdgpu] [ 4881.024852] ? dm_plane_helper_prepare_fb+0x143/0x270 [amdgpu] [ 4881.024855] ? _cond_resched+0x19/0x30 [ 4881.024858] ? wait_for_completion_timeout+0x3a/0x120 [ 4881.024859] ? _cond_resched+0x19/0x30 [ 4881.024861] ? wait_for_completion_interruptible+0x37/0x160 [ 4881.024877] commit_tail+0x99/0x130 [drm_kms_helper] [ 4881.024887] drm_atomic_helper_commit+0x123/0x150 [drm_kms_helper] [ 4881.024990] amdgpu_dm_atomic_commit+0x95/0xa0 [amdgpu] [ 4881.025013] drm_atomic_commit+0x4a/0x50 [drm] [ 4881.025031] drm_atomic_connector_commit_dpms+0xdf/0x100 [drm] [ 4881.025051] drm_mode_obj_set_property_ioctl+0x156/0x2d0 [drm] [ 4881.025070] ? drm_connector_set_obj_prop+0x90/0x90 [drm] [ 4881.025086] drm_connector_property_set_ioctl+0x3b/0x60 [drm] [ 4881.025103] drm_ioctl_kernel+0xae/0xf0 [drm] [ 4881.025119] drm_ioctl+0x234/0x3d0 [drm] [ 4881.025134] ? drm_connector_set_obj_prop+0x90/0x90 [drm] [ 4881.025209] amdgpu_drm_ioctl+0x4e/0x80 [amdgpu] [ 4881.025213] ksys_ioctl+0x9d/0xd0 [ 4881.025216] __x64_sys_ioctl+0x1a/0x20 [ 4881.025219] do_syscall_64+0x57/0x1b0 [ 4881.025223] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 4881.025225] RIP: 0033:0x7f5369e6c50b [ 4881.025227] Code: 0f 1e fa 48 8b 05 85 39 0d 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 0f 1f 44 00 00 f3 0f 1e fa b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 55 39 0d 00 f7 d8 64 89 01 48 [ 4881.025228] RSP: 002b:00007ffca7c0edc8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 [ 4881.025230] RAX: ffffffffffffffda RBX: 00007ffca7c0ee00 RCX: 00007f5369e6c50b [ 4881.025231] RDX: 00007ffca7c0ee00 RSI: 00000000c01064ab RDI: 000000000000000d [ 4881.025231] RBP: 00000000c01064ab R08: 0000000000000000 R09: 00007f5369744d10 [ 4881.025232] R10: 00007f5369744d20 R11: 0000000000000246 R12: 000055bf4e6e33f0 [ 4881.025233] R13: 000000000000000d R14: 0000000000000000 R15: 000055bf4e255980 [ 4881.025236] ---[ end trace 454162de3e2a2fb8 ]--- Complete "dmesg" output is attached. Lenovo replaced both the motherboard and docking station, but the problem is still present. However, I still believe it might be a hardware issue, since monitors also get dropped under Windows 10 or even in UEFI screen sporadically. Still communicating with Lenovo to investigate the issue. ** Attachment added: "dmesg-2021-03-09.txt" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1899336/+attachment/5475366/+files/dmesg-2021-03-09.txt -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1899336 Title: Thinkpad T14s (AMD) external monitors on docking station no longer detected Status in Ubuntu Budgie: New Status in linux package in Ubuntu: Confirmed Bug description: I run Ubuntu Budgie 20.04 on my Lenovo ThinkPad T14s with Ryzen 4750U processor together with the "Lenovo ThinkPad USB-C Dock (Gen 2)" (40AS0090EU). The docking station is connected via USB-C to the system, supplies it with power via USB Power Delivery and provides USB 3.1 Gen 2 (10 Gbit/s) connectivity (including an Ethernet controller and audio codec running over the USB data path), as well as support for two monitors via "DisplayPort alternate mode" of USB-C, so technically it will configure the four high-speed lanes of USB-C as one lane for SuperSpeed+ RX, one lane for SuperSpeed+ TX, and two lanes for DisplayPort 1.4, the latter of which the docking station will then demultiplex onto two full-size DisplayPort connectors like an MST hub. So far, external monitors have worked fine most of the time. However, for a couple of days now, I cannot get the system to detect the external monitors connected to my docking station anymore. The "BIOS" (EFI) boot screen (with the Lenovo logo) still shows up on the external monitors. However, both the LUKS/dm-crypt pre-boot- authentication screen (since I use full-disk-encryption) and also the desktop after login show up on the internal display, even with the laptop connected to the docking station, so it appears like the kernel no longer detects the monitors connecting via "DisplayPort alternate mode". Yesterday, I could get the monitors to show up by disconnecting the laptop from the docking station and reconnecting it again. Today, not even this appears to work. Sometimes the external monitors are detected (and shown as "enabled") in the display settings of Budgie, sometimes they do not even show up. Even when they show up and are enabled, nothing is displayed on them. The monitors say they do not receive a signal and I should check the connection. Unplugging and replugging the cables from the docking station to the monitors does not change anything. Audio, Ethernet and USB runs fine over the docking station, just DisplayPort does not. This is obviously very bad, since I now have to work on the internal display even with the laptop docked. I have the "amdgpu.exp_hw_support=1" in my kernel arguments (*) and the Ryzen 4000 GPU appears to be recognized. $ lspci -k 06:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Renoir (rev d1) Subsystem: Lenovo Renoir Kernel driver in use: amdgpu Kernel modules: amdgpu $ (*) When I installed Ubuntu Budgie 20.04, I needed to add this in order to extend my desktop over the two external monitors. Without this argument, the system only showed a single display in the settings, the same content was displayed on all connected monitors (mirrored) and there was no way to change that. I have attached parts of "dmesg" output which I deem relevant. $ uname -a Linux thinkpad-t14s 5.4.0-48-generic #52-Ubuntu SMP Thu Sep 10 10:58:49 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux $ --- ProblemType: Bug ApportVersion: 2.20.11-0ubuntu27.9 Architecture: amd64 CasperMD5CheckResult: skip CurrentDesktop: Budgie:GNOME DistroRelease: Ubuntu 20.04 InstallationDate: Installed on 2020-07-27 (75 days ago) InstallationMedia: Ubuntu-Budgie 20.04 LTS "Focal Fossa" - Release amd64 (20200423) MachineType: LENOVO 20UH001AGE Package: linux (not installed) ProcFB: 0 amdgpudrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-48-generic root=UUID=5b605ccb-8a29-46ee-b571-e0d61a323457 ro quiet splash amdgpu.exp_hw_support=1 vt.handoff=7 ProcVersionSignature: Ubuntu 5.4.0-48.52-generic 5.4.60 RelatedPackageVersions: linux-restricted-modules-5.4.0-48-generic N/A linux-backports-modules-5.4.0-48-generic N/A linux-firmware 1.187.3 Tags: focal Uname: Linux 5.4.0-48-generic x86_64 UpgradeStatus: No upgrade log present (probably fresh install) UserGroups: adm audio cdrom dip lpadmin lxd plugdev sambashare sudo _MarkForUpload: True dmi.bios.date: 06/11/2020 dmi.bios.vendor: LENOVO dmi.bios.version: R1CET36W(1.05 ) dmi.board.asset.tag: Not Available dmi.board.name: 20UH001AGE dmi.board.vendor: LENOVO dmi.board.version: Not Defined dmi.chassis.asset.tag: No Asset Information dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: None dmi.modalias: dmi:bvnLENOVO:bvrR1CET36W(1.05):bd06/11/2020:svnLENOVO:pn20UH001AGE:pvrThinkPadT14sGen1:rvnLENOVO:rn20UH001AGE:rvrNotDefined:cvnLENOVO:ct10:cvrNone: dmi.product.family: ThinkPad T14s Gen 1 dmi.product.name: 20UH001AGE dmi.product.sku: LENOVO_MT_20UH_BU_Think_FM_ThinkPad T14s Gen 1 dmi.product.version: ThinkPad T14s Gen 1 dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntubudgie/+bug/1899336/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
