No, my BIOS version is K5CN34WW
Do you have exactly the same computer model (Yoga 7 14ARB7)?
Do you have exactly the same Lenovo TB Dock?

12.12.2022 19:05:22 Steven Hong <email address hidden>:

> I have same issue like u. did you update your bios?
> I have same issue after updating my BIOS.
> 
> Used so well until bios updates.
> 
> The bios Code is : JVEC31WW
> 
> -- 
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1998673
> 
> Title:
>   [amdgpu] External Display via Lenovo TB3 Dock on AMD Ryzen CPU not
>   working
> 
> Status in linux package in Ubuntu:
>   Confirmed
> 
> Bug description:
>   I have a Lenovo Yoga 7 Gen 7 (14ARB7) with AMD Ryzen 7 6800U CPU, with
>   integrated AMD Radeon Graphics and USB4. I know this is quite new
>   hardware, but I am astonished that many things work right out of the
>   box.
> 
>   Ubuntu 22.04 with Mainline Kernel Linux 6.0.9-060009-generic #202211170559-Ubuntu SMP PREEMPT_DYNAMIC Thu Nov 17 06:06:21 UTC x86_64 x86_64 x86_64 GNU/Linux
>   Did some cross checks with Kernel 5.15.0-56 (stable)
>   Monitor Samsung U32R592CWU UHD 4K (3.840 x 2.160 Pixel, VA-Panel, 16:9 Format, 60 Hz, 4ms)
> 
>   What I have issues with (In this issue I'll only report on topic 1):
> 
>   1) External Monitor
>   2) Touchscreen not working after suspend by closing lid; suspend only works once
>   3) Integrated keyboard only works with Kernel 6 (Mainline) (kind of solved)
> 
>   I tested multiple ways connecting external monitors, each of them only working to some extent:
>   i) directly via HDMI port of Notebook
>   ii) via Lenovo Thinkpad Thunderbolt 3 Dock 40AC DisplayPort or HDMI (preferred solution)
>   iii) via an Razer Core X eGPU with Radeon RX570 DisplayPort or HDMI
> 
>   Problems/Observations:
>   1) DP/HDMI via Dock mostly not working (exception see point 3). USB via Dock works however.
>   2) Booting with HDMI connected to Dock on Kernel 6 stalls. When unplugging the monitor the boot process immediately resumes successfully.
>   3) Booting with HDMI connected to Dock on Kernel 5 brings up the screen, after that Hot Plug is also working, even DP
>   4) Booting with DP connected to Dock on Kernel 5 does not bring up the screen, neither after Hot-Plug of HDMI or DP
>   5) Booting without Monitor connected on Kernel 5 does not bring up the screen on Hot Plug, neither HDMI nor DP
>   6) Hot Plugging the monitors (way i and iii) sometimes freezes the system, needs hard reset.
>   7) Turning off or disconnecting TB cable of eGPU may also cause a freeze (as this also disconnects the monitor it may have the same cause as 2)
> 
>   So to sum it up: External Screens via this Docking Stations is only
>   working on Kernel 5 when the monitor is connected via HDMI during
>   boot, but not in any other case.
> 
>   Side observations:
>   1) The USB devices connected to the TB3 Dock come up very slowly after hot plugging the TB3 connector to the Notebook.
>   2) Mouse cursor (external mouse connected to Dock) hangs from time to time on Kernel 5.
> 
>   Please notify me if you need further logs. The automatically collected
>   logs were captured in situation 2 above. You'll see the gap in the
>   timestamps of th DMESG output.
> 
>   ProblemType: Bug
>   DistroRelease: Ubuntu 22.04
>   Package: xorg 1:7.7+23ubuntu2
>   Uname: Linux 6.0.9-060009-generic x86_64
>   ApportVersion: 2.20.11-0ubuntu82.2
>   Architecture: amd64
>   BootLog: Error: [Errno 13] Keine Berechtigung: '/var/log/boot.log'
>   CasperMD5CheckResult: pass
>   CompositorRunning: None
>   CurrentDesktop: MATE
>   Date: Sat Dec  3 18:10:13 2022
>   DistUpgraded: Fresh install
>   DistroCodename: jammy
>   DistroVariant: ubuntu
>   ExtraDebuggingInterest: Yes
>   GraphicsCard:
>    Advanced Micro Devices, Inc. [AMD/ATI] Rembrandt [1002:1681] (rev c1) (prog-if 00 [VGA controller])
>      Subsystem: Lenovo Device [17aa:3801]
>   InstallationDate: Installed on 2022-11-23 (9 days ago)
>   InstallationMedia: Ubuntu-MATE 22.04.1 LTS "Jammy Jellyfish" - Release amd64 (20220809.1)
>   MachineType: LENOVO 82QF
>   ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-6.0.9-060009-generic root=UUID=3031ba9e-0a88-4dc4-8cb6-65fab38e8fda ro quiet splash vt.handoff=7
>   SourcePackage: xorg
>   Symptom: display
>   UpgradeStatus: No upgrade log present (probably fresh install)
>   dmi.bios.date: 08/19/2022
>   dmi.bios.release: 1.34
>   dmi.bios.vendor: LENOVO
>   dmi.bios.version: K5CN34WW
>   dmi.board.asset.tag: NO Asset Tag
>   dmi.board.name: LNVNB161216
>   dmi.board.vendor: LENOVO
>   dmi.board.version: SDK0T76461 WIN
>   dmi.chassis.asset.tag: NO Asset Tag
>   dmi.chassis.type: 31
>   dmi.chassis.vendor: LENOVO
>   dmi.chassis.version: Yoga 7 14ARB7
>   dmi.ec.firmware.release: 1.34
>   dmi.modalias: dmi:bvnLENOVO:bvrK5CN34WW:bd08/19/2022:br1.34:efr1.34:svnLENOVO:pn82QF:pvrYoga714ARB7:rvnLENOVO:rnLNVNB161216:rvrSDK0T76461WIN:cvnLENOVO:ct31:cvrYoga714ARB7:skuLENOVO_MT_82QF_BU_idea_FM_Yoga714ARB7:
>   dmi.product.family: Yoga 7 14ARB7
>   dmi.product.name: 82QF
>   dmi.product.sku: LENOVO_MT_82QF_BU_idea_FM_Yoga 7 14ARB7
>   dmi.product.version: Yoga 7 14ARB7
>   dmi.sys.vendor: LENOVO
>   version.compiz: compiz N/A
>   version.libdrm2: libdrm2 2.4.110-1ubuntu1
>   version.libgl1-mesa-dri: libgl1-mesa-dri 22.0.5-0ubuntu0.1
>   version.libgl1-mesa-glx: libgl1-mesa-glx N/A
>   version.xserver-xorg-core: xserver-xorg-core 2:21.1.3-2ubuntu2.3
>   version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
>   version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-2ubuntu1
>   version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20210115-1
>   version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.17-2build1
> 
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