[amdgpu] Graphics driver issue: Display goes black for a second at random: [drm:link_enc_cfg_validate [amdgpu]] *ERROR* link_enc_cfg_validate: Invalid link encoder assignments - 0x1c

[Nikhil Kaushik]

After some update my display randomly goes black for just a second and comes back. It happens randomly and I looked into journalctl and found this error message.

Jun 22 15:45:25 nikhil-T14 rtkit-daemon[1192]: Supervising 8 threads of 4 processes of 1 users.
Jun 22 15:45:25 nikhil-T14 rtkit-daemon[1192]: Supervising 8 threads of 4 processes of 1 users.
Jun 22 15:45:55 nikhil-T14 systemd[1579]: Started Application launched by gnome-shell.
Jun 22 15:46:12 nikhil-T14 gnome-shell[1735]: meta_window_set_stack_position_no_sync: assertion 'window->stack_position >= 0' failed
Jun 22 15:46:20 nikhil-T14 kernel: [drm:link_enc_cfg_validate [amdgpu]] *ERROR* link_enc_cfg_validate: Invalid link encoder assignments - 0x1c

ProblemType: Bug
DistroRelease: Ubuntu 22.04
Package: xorg 1:7.7+23ubuntu2
ProcVersionSignature: Ubuntu 6.5.0-1024.25-oem 6.5.13
Uname: Linux 6.5.0-1024-oem x86_64
ApportVersion: 2.20.11-0ubuntu82.5
Architecture: amd64
BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
CasperMD5CheckResult: pass
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Sat Jun 22 15:50:25 2024
DistUpgraded: Fresh install
DistroCodename: jammy
DistroVariant: ubuntu
ExtraDebuggingInterest: Yes
GraphicsCard:
 Advanced Micro Devices, Inc. [AMD/ATI] Device [1002:15bf] (rev dd) (prog-if 00 [VGA controller])
   Subsystem: Lenovo Device [17aa:50d9]
InstallationDate: Installed on 2024-05-22 (30 days ago)
InstallationMedia: Ubuntu 22.04.4 LTS "Jammy Jellyfish" - Release amd64 (20240220)
MachineType: LENOVO 21K4CTO1WW
ProcEnviron:
 LANGUAGE=en_IN:en
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_IN
 SHELL=/usr/bin/zsh
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.5.0-1024-oem root=UUID=d21844b5-a890-4fbf-9467-81c69986a31d ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 02/20/2024
dmi.bios.release: 1.35
dmi.bios.vendor: LENOVO
dmi.bios.version: R2FET55W (1.35 )
dmi.board.asset.tag: Not Available
dmi.board.name: 21K4CTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: Not Defined
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.ec.firmware.release: 1.16
dmi.modalias: dmi:bvnLENOVO:bvrR2FET55W(1.35):bd02/20/2024:br1.35:efr1.16:svnLENOVO:pn21K4CTO1WW:pvrThinkPadT14Gen4:rvnLENOVO:rn21K4CTO1WW:rvrNotDefined:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_21K4_BU_Think_FM_ThinkPadT14Gen4:
dmi.product.family: ThinkPad T14 Gen 4
dmi.product.name: 21K4CTO1WW
dmi.product.sku: LENOVO_MT_21K4_BU_Think_FM_ThinkPad T14 Gen 4
dmi.product.version: ThinkPad T14 Gen 4
dmi.sys.vendor: LENOVO
version.compiz: compiz N/A
version.libdrm2: libdrm2 2.4.113-2~ubuntu0.22.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 23.2.1-1ubuntu3.1~22.04.2
version.libgl1-mesa-glx: libgl1-mesa-glx N/A
version.xserver-xorg-core: xserver-xorg-core 2:21.1.4-2ubuntu1.7~22.04.10
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

[Daniel van Vugt (vanvugt)]

Thanks for the bug report. CurrentDmesg.txt appears to show the amdgpu kernel driver crashed in display-related functions, so that is almost certainly the problem here.

Given how new the hardware is, I would recommend installing Ubuntu 24.04 instead, which includes a newer kernel and newer graphics drivers.

https://ubuntu.com/download/desktop

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Mark Chambers (mwchambers)]

Hi,

I believe the blank screen always corresponds with a dmesg entry:

 *ERROR* link_enc_cfg_validate: Invalid link encoder assignments - 0x1c

This is not necessarily accompanied by a call trace.

It appears my hardware is similar to nikhilkaushik, they're both fairly new thinkpads (AMD)

I have had 22.04 running on this without the black screen issue since 2024-05-11 (May 11th).
The problem has only started recently (in last week or so).

Looking at what has changed I would guess it was the update to linux-firmware 20220329.git681281e4-0ubuntu3.31 which is when this started happening.

dpkg.log: 2024-06-20 17:52:45 upgrade linux-firmware:all 20220329.git681281e4-0ubuntu3.30 20220329.git681281e4-0ubuntu3.31

I've copied the amdgpu firmware blobs from 20220329.git681281e4-0ubuntu3.30 into /lib/firmware/amdgpu
to see if it is the firmware change that has caused it. I will have to wait to see if it continues to happen.

System:
  Host: ThinkPad Kernel: 6.5.0-1024-oem x86_64 bits: 64 Desktop: GNOME 42.9
    Distro: Ubuntu 22.04.4 LTS (Jammy Jellyfish)
Machine:
  Type: Laptop System: LENOVO product: 21K9CTO1WW v: ThinkPad P16s Gen 2
    serial: <superuser required>
  Mobo: LENOVO model: 21K9CTO1WW serial: <superuser required> UEFI: LENOVO
    v: R2FET55W (1.35 ) date: 02/20/2024
CPU:
  Info: 8-core model: AMD Ryzen 7 PRO 7840U w/ Radeon 780M Graphics bits: 64
    type: MT MCP cache: L2: 8 MiB
  Speed (MHz): avg: 819 min/max: 400/5447:6076:5132:5760:5918:5605:5289
    cores: 1: 400 2: 400 3: 1516 4: 1403 5: 400 6: 400 7: 400 8: 400 9: 1446
    10: 400 11: 1462 12: 400 13: 1443 14: 400 15: 1835 16: 400
Graphics:
  Device-1: AMD driver: amdgpu v: kernel
  Device-2: Luxvisions Innotech Integrated Camera type: USB
    driver: uvcvideo
  Display: wayland server: X.Org v: 1.22.1.1 with: Xwayland v: 22.1.1
    compositor: gnome-shell driver: gpu: amdgpu resolution: 1920x1200~60Hz
  OpenGL:
    renderer: GFX1103_R1 (gfx1103_r1 LLVM 15.0.7 DRM 3.54 6.5.0-1024-oem)
    v: 4.6 Mesa 23.2.1-1ubuntu3.1~22.04.2

[Mark Chambers (mwchambers)]

Update: The problem occurred again with the changed firmware, so please ignore my earlier message about the firmware.

I will run with the older 6.5.0-1023-oem for now to see if it works.

Others with similar hardware might find this of interest:

https://bugs.launchpad.net/ubuntu/+source/linux-oem-6.5/+bug/2069357

Especially the note that "6.5 OEM kernel will be retired soon."

Hope this helps someone.

[Kyle Fazzari (kyrofa)]

> I would recommend installing Ubuntu 24.04 instead

Daniel, I'm seeing this same issue on the Lenovo Z13 gen2, which is certified by Canonical to work with 22.04 (and that is indeed what I'm running):

https://ubuntu.com/certified/202310-32232

Also, the kernel for this machine in 24.04 has its own issues, e.g. https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2069416 .

Anyway, I logged a dupe at https://bugs.launchpad.net/ubuntu/+source/linux-signed-oem-6.5/+bug/2070960 before Mark caught it (thanks Mark). Note that this does not appear to be happening with 6.5.0-1023-oem, so it appears that 6.5.0-1024-oem introduced this issue.

[Mario Limonciello (superm1)]

Here's at least part of the problem.

commit 15c983d0cbb5a158eafb9cb88e6d8dfc4477d9c2
Author: Melissa Wen <email address hidden>
Date: Fri Dec 29 15:25:00 2023 -0100

    drm/amd/display: fix bandwidth validation failure on DCN 2.1

    BugLink: https://bugs.launchpad.net/bugs/2059068

    commit 3a0fa3bc245ef92838a8296e0055569b8dff94c4 upstream.

    IGT `amdgpu/amd_color/crtc-lut-accuracy` fails right at the beginning of
    the test execution, during atomic check, because DC rejects the
    bandwidth state for a fb sizing 64x64. The test was previously working
    with the deprecated dc_commit_state(). Now using
    dc_validate_with_context() approach, the atomic check needs to perform a
    full state validation. Therefore, set fast_validation to false in the
    dc_validate_global_state call for atomic check.

    Cc: <email address hidden>
    Fixes: b8272241ff9d ("drm/amd/display: Drop dc_commit_state in favor of dc_commit_streams")
    Signed-off-by: Melissa Wen <email address hidden>
    Signed-off-by: Hamza Mahfooz <email address hidden>
    Signed-off-by: Alex Deucher <email address hidden>
    Signed-off-by: Greg Kroah-Hartman <email address hidden>
    Signed-off-by: Portia Stephens <email address hidden>
    Signed-off-by: Stefan Bader <email address hidden>

That commit was reverted upstream.

https://github.com/torvalds/linux/commit/c2ab9ce0ee7225fc05f58a6671c43b8a3684f530

[Mario Limonciello (superm1)]

And that commit did go back to stable: https://git.kernel.org/stable/c/6266b3a312b7f69c883c2d7c82d85772464421d2

So I guess Canonical team missed it.

[Petter Reinholdtsen (pere-hungry)]

I suspect I experience the same problem with a Vivobook Go. I got messages like "[174397.518333] [drm:link_enc_cfg_validate [amdgpu]] *ERROR* link_enc_cfg_validate: Invalid link encoder assignments - 0x1c" in dmesg and the screen go black and stay like that for a while regularly.

[Daniel van Vugt (vanvugt)]

CC Stefan Bader