Hi! Are you sure this is not a hardware issue?
The reason I believe it is a hardware issue is because I observed my system "drop monitors" on the docking station also under Windows 10 and even while in the UEFI. Lenovo replaced both the motherboard and the docking station (and I updated firmware for both multiple times), however the issue is still present. You say that for you, the problem does not appear under Windows. However, note that (at least in my case) this is a sporadic issue, so it may show up every day or every week or only every one or two months. I know of absolutely no way to predict or even "provoke" this. So are you really sure it is not present for Windows, i. e. have you run the system for MONTHS under Windows and are you sure that your monitors never went off, even for a second or two? I just wanna say that it may be very hard to judge whether this bug is present or not, because it sometimes occurs VERY seldomly. Since I observed it under both Windows 10 and Ubuntu Linux 20.04 LTS and also while in UEFI, I'm pretty sure it is not (only) a software issue. However, I had both motherboard and docking station replaced and it still occurs, suggesting that it may actually be not just a faulty component, but an issue in the actual hardware design, in which case it might affect the entire notebook or even APU series. -- 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/1908139 Title: ThinkPad T14s external display not working on ThinkPad USB-C Dock Gen2 Status in linux package in Ubuntu: Confirmed Bug description: laptop: ThinkPad T14s Gen 1 - AMD Ryzen 7 PRO 4750U docking station: ThinkPad USB-C Dock 2. Gen. external display: NE MultiSync EA275UHD OS: Ubuntu 20.10 - kernel 5.8.0 Plugging the external display into one of the docking station's two DisplayPort connectors leads to the screen resolution changing on the laptop's builtin display and the external display waking up but showing no picture and displaying "no-signal" after a bit. Plugging the external display into the docking station's HDMI connector leads to no visible reaction on either the external nor the builtin display. Plugging the external display into the laptop's builtin HDMI connector works as expected. The external display is recognized and shows an image. I have recorded the output on `dmesg` during the steps mentioned above and inserted explanations using `echo MSG >/dev/kmsg`. The output follows at the end of the message. I believe `ubuntu-bug` should also attach the full log. All above modes of connection work as expected with the same laptop, dock, and display on Windows 10 (installed as dual boot along side Ubuntu). All above modes of connection also work as expected with an older laptop (ThinkPad T470s - Ubuntu 20.04 - kernel 5.4.0), and the same dock and display. This leads me to believe that this is not a hardware issue. The following bug seems related, but seems to have been observed on faulty hardware according to its author. Therefore, I decided to open a separate bug report. https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1899336 ``` [ 343.372511] plugging DisplayPort into dock port 1 [ 352.666113] [drm] DP Alt mode state on HPD: 1 [ 352.749192] [drm] DM_MST: starting TM on aconnector: 000000002105a317 [id: 75] [ 352.858482] [drm] amdgpu_dm_irq_schedule_work FAILED src 9 [ 352.888400] [drm] amdgpu_dm_irq_schedule_work FAILED src 9 [ 352.892555] [drm] amdgpu_dm_irq_schedule_work FAILED src 9 [ 352.896719] [drm] amdgpu_dm_irq_schedule_work FAILED src 9 [ 352.900876] [drm] amdgpu_dm_irq_schedule_work FAILED src 9 [ 352.905596] [drm] amdgpu_dm_irq_schedule_work FAILED src 9 [ 352.910323] [drm] amdgpu_dm_irq_schedule_work FAILED src 9 [ 352.914485] [drm] amdgpu_dm_irq_schedule_work FAILED src 9 [ 377.353566] plugged in - no signal [ 396.728970] unplugging [ 403.001418] [drm] DM_MST: stopping TM on aconnector: 000000002105a317 [id: 75] [ 415.576397] unplugged [ 431.500729] plugging DisplayPort into dock port 2 [ 437.607724] [drm] DP Alt mode state on HPD: 1 [ 437.681116] [drm] DM_MST: starting TM on aconnector: 000000002105a317 [id: 75] [ 437.790303] [drm] amdgpu_dm_irq_schedule_work FAILED src 9 [ 437.820138] [drm] amdgpu_dm_irq_schedule_work FAILED src 9 [ 437.824305] [drm] amdgpu_dm_irq_schedule_work FAILED src 9 [ 437.828462] [drm] amdgpu_dm_irq_schedule_work FAILED src 9 [ 437.832619] [drm] amdgpu_dm_irq_schedule_work FAILED src 9 [ 437.837029] [drm] amdgpu_dm_irq_schedule_work FAILED src 9 [ 437.841984] [drm] amdgpu_dm_irq_schedule_work FAILED src 9 [ 437.846144] [drm] amdgpu_dm_irq_schedule_work FAILED src 9 [ 458.999849] plugged in - no signal [ 465.702949] unplugging [ 476.127418] [drm] DM_MST: stopping TM on aconnector: 000000002105a317 [id: 75] [ 476.956491] [drm] Failed to add display topology, DTM TA is not initialized. [ 488.792533] unplugged [ 529.801179] plugging HDMI into dock [ 536.721076] [drm] DP Alt mode state on HPD: 1 [ 536.792947] [drm] DM_MST: starting TM on aconnector: 000000002105a317 [id: 75] [ 536.901958] [drm] amdgpu_dm_irq_schedule_work FAILED src 9 [ 536.906123] [drm] amdgpu_dm_irq_schedule_work FAILED src 9 [ 536.910288] [drm] amdgpu_dm_irq_schedule_work FAILED src 9 [ 536.914611] [drm] amdgpu_dm_irq_schedule_work FAILED src 9 [ 536.919568] [drm] amdgpu_dm_irq_schedule_work FAILED src 9 [ 536.923725] [drm] amdgpu_dm_irq_schedule_work FAILED src 9 [ 536.927888] [drm] amdgpu_dm_irq_schedule_work FAILED src 9 [ 536.932047] [drm] amdgpu_dm_irq_schedule_work FAILED src 9 [ 536.936451] [drm] amdgpu_dm_irq_schedule_work FAILED src 9 [ 536.941486] [drm] amdgpu_dm_irq_schedule_work FAILED src 9 [ 536.945651] [drm] amdgpu_dm_irq_schedule_work FAILED src 9 [ 536.949808] [drm] amdgpu_dm_irq_schedule_work FAILED src 9 [ 537.010093] [drm:drm_dp_send_dpcd_read [drm_kms_helper]] *ERROR* mstb 00000000271ba325 port 1: DPCD read on addr 0x60 for 1 bytes NAKed [ 592.844147] plugged in - display does not react [ 597.998141] unplugging [ 604.657060] [drm] DM_MST: stopping TM on aconnector: 000000002105a317 [id: 75] [ 612.058516] unplugged [ 630.409181] plugging HDMI into laptop [ 637.125592] [drm] Failed to add display topology, DTM TA is not initialized. [ 639.077839] [drm] Failed to add display topology, DTM TA is not initialized. [ 639.192248] [drm] Failed to add display topology, DTM TA is not initialized. [ 683.221820] plugged in - working [ 690.347738] unplugging [ 694.212298] [drm] Failed to add display topology, DTM TA is not initialized. [ 725.466488] unplugged ``` ProblemType: Bug DistroRelease: Ubuntu 20.10 Package: linux-image-5.8.0-33-generic 5.8.0-33.36 ProcVersionSignature: Ubuntu 5.8.0-33.36-generic 5.8.17 Uname: Linux 5.8.0-33-generic x86_64 ApportVersion: 2.20.11-0ubuntu50.2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC2: aj 1262 F.... pulseaudio /dev/snd/controlC1: aj 1262 F.... pulseaudio /dev/snd/controlC3: aj 1262 F.... pulseaudio /dev/snd/controlC0: aj 1262 F.... pulseaudio CasperMD5CheckResult: skip CurrentDesktop: ubuntu:GNOME Date: Mon Dec 14 22:11:01 2020 InstallationDate: Installed on 2020-12-12 (2 days ago) InstallationMedia: Ubuntu 20.10 "Groovy Gorilla" - Release amd64 (20201022) MachineType: LENOVO 20UHCTO1WW ProcFB: 0 amdgpudrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.8.0-33-generic root=/dev/mapper/vgubuntu-root ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-5.8.0-33-generic N/A linux-backports-modules-5.8.0-33-generic N/A linux-firmware 1.190.2 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 09/15/2020 dmi.bios.release: 1.25 dmi.bios.vendor: LENOVO dmi.bios.version: R1CET56W(1.25 ) dmi.board.asset.tag: Not Available dmi.board.name: 20UHCTO1WW 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.ec.firmware.release: 1.25 dmi.modalias: dmi:bvnLENOVO:bvrR1CET56W(1.25):bd09/15/2020:br1.25:efr1.25:svnLENOVO:pn20UHCTO1WW:pvrThinkPadT14sGen1:rvnLENOVO:rn20UHCTO1WW:rvrNotDefined:cvnLENOVO:ct10:cvrNone: dmi.product.family: ThinkPad T14s Gen 1 dmi.product.name: 20UHCTO1WW 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/ubuntu/+source/linux/+bug/1908139/+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
