Public bug reported:
I am reporting a hardware-specific regression on the Lenovo IdeaPad Slim
3 15ARP10.
Hardware details:
- Model: Lenovo IdeaPad Slim 3 15ARP10 (Product ID: 83K7)
- BIOS Version: QBCN23WW
- CPU: AMD Ryzen (AMD PMC)
- Kernel: 7.0.0-15-generic
Problem:
When the system enters s2idle (Modern Standby) and is subsequently woken up,
the internal keyboard becomes completely unresponsive. The mouse/touchpad may
continue to function, but no keyboard input is registered. This requires a hard
reboot to regain functionality. Occasionally, this state also causes the
Embedded Controller (EC) to desync, resulting in non-functional Caps Lock/Num
Lock LEDs until a cold power cycle is performed.
Verified Fix:
The issue is resolved by enabling the Smart Trace Buffer (STB) on the AMD PMC
driver.
By creating /etc/modprobe.d/amd_pmc.conf with the following contents:
'options amd_pmc enable_stb=1'
and updating initramfs, the keyboard functions perfectly upon waking from
suspend.
Request:
Please add a kernel quirk for the 15ARP10 (83K7) to enable 'enable_stb=1' by
default for this hardware configuration.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-15-generic 7.0.0-15.15
ProcVersionSignature: Ubuntu 7.0.0-15.15-generic 7.0.0
Uname: Linux 7.0.0-15-generic x86_64
ApportVersion: 2.34.0-0ubuntu2
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: lenovo 2334 F.... wireplumber
/dev/snd/controlC0: lenovo 2334 F.... wireplumber
/dev/snd/seq: lenovo 2305 F.... pipewire
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
Date: Sun May 10 11:51:01 2026
InstallationDate: Installed on 2026-05-09 (1 days ago)
InstallationMedia: Ubuntu 26.04 "Resolute Raccoon" - Release amd64 (20260423.1)
MachineType: LENOVO 83K7
ProcEnviron:
LANG=en_US.UTF-8
PATH=(custom, no user)
SHELL=/bin/bash
TERM=xterm-256color
XDG_RUNTIME_DIR=<set>
ProcFB: 0 amdgpudrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-15-generic
root=UUID=fc86b4d9-69b2-4a38-af03-44f6866ae992 ro quiet splash
crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
SourcePackage: linux
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/05/2025
dmi.bios.release: 1.23
dmi.bios.vendor: LENOVO
dmi.bios.version: QBCN23WW
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: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: IdeaPad Slim 3 15ARP10
dmi.ec.firmware.release: 1.23
dmi.modalias:
dmi:bvnLENOVO:bvrQBCN23WW:bd06/05/2025:br1.23:efr1.23:svnLENOVO:pn83K7:pvrIdeaPadSlim315ARP10:rvnLENOVO:rnLNVNB161216:rvrSDK0T76461WIN:cvnLENOVO:ct10:cvrIdeaPadSlim315ARP10:skuLENOVO_MT_83K7_BU_idea_FM_IdeaPadSlim315ARP10:pfaIdeaPadSlim315ARP10:
dmi.product.family: IdeaPad Slim 3 15ARP10
dmi.product.name: 83K7
dmi.product.sku: LENOVO_MT_83K7_BU_idea_FM_IdeaPad Slim 3 15ARP10
dmi.product.version: IdeaPad Slim 3 15ARP10
dmi.sys.vendor: LENOVO
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
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https://bugs.launchpad.net/bugs/2152120
Title:
Lenovo IdeaPad Slim 3 15ARP10 (83K7) keyboard unresponsive after
s2idle wake
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