[Bug 2158286] Re: NFC driver on Thinkpad T14 AMD gen4 causes a lot interrupts

Hi, Gabriela, here it is. on the current 7.0.0-27 journalctl -b 0 -k > kernel_lp2158286_ubuntu7.0.0-27.log $ cat top_ubuntu7.0.0-27.txt top - 19:11:31 up 6 min, 1 user, load average: 4.40, 1.88, 0.89 Tasks: 721 total, 1 running, 720 sleeping, 0 stopped, 0 zombie %Cpu(s): 0.6 us, 3.9 sy, 0.0 ni, 95.5 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st MiB Mem : 30209.5 total, 16793.8 free, 5993.6 used, 7629.5 buff/cache MiB Swap: 8192.0 total, 8192.0 free, 0.0 used. 24215.9 avail Mem PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 787 root -51 0 0 0 0 S 33.3 0.0 2:03.80 irq/91-+ 4666 root 20 0 0 0 0 I 16.7 0.0 0:00.61 kworker+ 573 root 20 0 0 0 0 I 8.3 0.0 0:00.38 kworker+ 4664 root 20 0 0 0 0 I 8.3 0.0 0:00.97 kworker+ 17210 mastier 20 0 16468 6420 4236 R 8.3 0.0 0:00.02 top 1 root 20 0 28840 19068 11100 S 0.0 0.1 0:03.86 systemd 2 root 20 0 0 0 0 S 0.0 0.0 0:00.02 kthreadd 3 root 20 0 0 0 0 S 0.0 0.0 0:00.00 pool_wo+ 4 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 kworker+ 5 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 kworker+ 6 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 kworker+ 7 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 kworker+ 8 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 kworker+ ** Attachment added: "kernel_lp2158286_ubuntu7.0.0-27.log" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2158286/+attachment/5979765/+files/kernel_lp2158286_ubuntu7.0.0-27.log -- You received this bug notification because you are subscribed to linux in Ubuntu. Matching subscriptions: Bgg, Bmail, Nb https://bugs.launchpad.net/bugs/2158286 Title: NFC driver on Thinkpad T14 AMD gen4 causes a lot interrupts Status in linux package in Ubuntu: New Bug description: Recently on kernel 7.0.0-generic-22 (after upgrade from 24.04 to 26.04) my fans started to behave quite noisy even in Balanced mode (3000rpm), while in powersaving instead of going down to 0 RPM and still oscilate at 2200RPM level. So I researched and it seems there is NFC driver causing a lot interrupts  mastier@earl:~$ cat /proc/acpi/ibm/fan   status: enabled   speed: 3081   level: auto   mastier@earl:~$ sensors   thinkpad-isa-0000   Adapter: ISA adapter   fan1: 3077 RPM   fan2: 3077 RPM   CPU: +56.0°C ... The interrupts: mastier@earl:~$ top -b -n 1 -o +%CPU | head -n 20 top - 16:57:13 up 5:08, 1 user, load average: 1.13, 1.29, 1.05 Tasks: 736 total, 1 running, 735 sleeping, 0 stopped, 0 zombie %Cpu(s): 3.4 us, 6.7 sy, 0.0 ni, 89.4 id, 0.0 wa, 0.0 hi, 0.6 si, 0.0 st MiB Mem : 30209.5 total, 2540.6 free, 14878.1 used, 10510.9 buff/cache MiB Swap: 8192.0 total, 8192.0 free, 0.0 used. 15331.4 avail Mem     PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND   13162 mastier 20 0 28.6g 900176 316932 S 91.7 2.9 16:06.74 firefox     773 root -51 0 0 0 0 S 33.3 0.0 96:47.99 irq/91-+    2186 root 20 0 1423172 57652 25748 S 8.3 0.2 1:55.52 tailsca+  136500 mastier 20 0 16464 6384 4204 R 8.3 0.0 0:00.02 top       1 root 20 0 28836 19296 11248 S 0.0 0.1 0:06.74 systemd       2 root 20 0 0 0 0 S 0.0 0.0 0:00.89 kthreadd       3 root 20 0 0 0 0 S 0.0 0.0 0:00.00 pool_wo+ ...  $ grep "91:" /proc/interrupts   91: 0 0 0 0 0 834177081 0 0 0 0 0 0 0 0 0 0 amd_gpio 84 nxp-nci_i2c ```` so I unloaded this driver temporarily and now it looks better sudo rmmod nxp_nci_i2c sudo rmmod nxp_nci now looks better mastier@earl:~$ top -b -n 1 -o +%CPU | head -n 20 top - 17:14:56 up 5:26, 1 user, load average: 1.15, 0.92, 0.95 Tasks: 734 total, 1 running, 733 sleeping, 0 stopped, 0 zombie %Cpu(s): 3.6 us, 1.6 sy, 0.0 ni, 94.8 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st MiB Mem : 30209.5 total, 1952.3 free, 15122.9 used, 10699.8 buff/cache MiB Swap: 8192.0 total, 8192.0 free, 0.0 used. 15086.6 avail Mem     PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND  148217 mastier 20 0 16464 6384 4204 R 16.7 0.0 0:00.03 top    8911 mastier 20 0 10.9g 423028 205996 S 8.3 1.4 24:40.69 gnome-s+   16791 mastier 20 0 2716908 131808 77456 S 8.3 0.4 0:45.95 Isolate+       1 root 20 0 28836 19296 11248 S 0.0 0.1 0:06.83 systemd       2 root 20 0 0 0 0 S 0.0 0.0 0:00.93 kthreadd       3 root 20 0 0 0 0 S 0.0 0.0 0:00.00 pool_wo+       4 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 kworker+       5 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 kworker+       6 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 kworker+       7 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 kworker+       8 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 kworker+      10 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 kworker+      13 root 0 -20 0 0 0 I 0.0 0.0 0:00.00 kworker+ It seems to be the result of the following regression: https://patchew.org/linux/20260519-nfc-nxp-nci-i2c-restore-irq-trigger-fallback-v4-1-8580d8e18016@amd.com/ https://patchew.org/linux/20260511082611.12721-1-bartosz.golaszewski@oss.qualcomm.com/ also relevant thread: https://bbs.archlinux.org/viewtopic.php?id=312733 ProblemType: Bug DistroRelease: Ubuntu 26.04 Package: linux-image-7.0.0-22-generic 7.0.0-22.22 ProcVersionSignature: Ubuntu 7.0.0-22.22-generic 7.0.0 Uname: Linux 7.0.0-22-generic x86_64 NonfreeKernelModules: zfs ApportVersion: 2.34.0-0ubuntu2 Architecture: amd64 CasperMD5CheckResult: pass CurrentDesktop: ubuntu:GNOME Date: Thu Jun 25 17:03:23 2026 InstallationDate: Installed on 2025-04-12 (439 days ago) InstallationMedia: Ubuntu 24.04.2 LTS "Noble Numbat" - Release amd64 (20250215) MachineType: LENOVO 21K3S0DS00 ProcFB: 0 amdgpudrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-7.0.0-22-generic root=/dev/mapper/ubuntu--vg-ubuntu--lv ro amdgpu.dcdebugmask=0x8000 quiet splash crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M SourcePackage: linux UpgradeStatus: Upgraded to resolute on 2026-05-19 (37 days ago) dmi.bios.date: 03/19/2026 dmi.bios.release: 1.49 dmi.bios.vendor: LENOVO dmi.bios.version: R2FET69W (1.49 ) dmi.board.asset.tag: Not Available dmi.board.name: 21K3S0DS00 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: 1.33 dmi.modalias: dmi:bvnLENOVO:bvrR2FET69W(1.49):bd03/19/2026:br1.49:efr1.33:svnLENOVO:pn21K3S0DS00:pvrThinkPadT14Gen4:rvnLENOVO:rn21K3S0DS00:rvrNotDefined:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_21K3_BU_Think_FM_ThinkPadT14Gen4:pfaThinkPadT14Gen4: dmi.product.family: ThinkPad T14 Gen 4 dmi.product.name: 21K3S0DS00 dmi.product.sku: LENOVO_MT_21K3_BU_Think_FM_ThinkPad T14 Gen 4 dmi.product.version: ThinkPad T14 Gen 4 dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2158286/+subscriptions