Re: [BUG] Usb fingerprint sensor constantly resetting on MSI Prestige 16 Flip AI+ C3MTG

[Michal Pecio <michal.pecio@gmail.com>]

On Thu, 17 Sep 2026 20:29:10 +0800, EricLin wrote:
> Here are the outputs of strace
> 
> $ strace -eioctl fprintd-verify
> ioctl(1, TCGETS2, {c_iflag=ICRNL|IXON|IUTF8, c_oflag=NL0|CR0|TAB0|BS0|VT0|FF0|OPOST|ONLCR, c_cflag=B38400|CS8|CREAD, c_lflag=ISIG|ICANON|ECHO|ECHOE|ECHOK|IEXTEN|ECHOCTL|ECHOKE, ...}) = 0
> [...]

This process isn't touching any USB device, maybe it forks something
or talks to a daemon which does the dirty work.

> [  146.079223] CPU: 0 UID: 0 PID: 3544 Comm: fprintd Tainted: G        W           7.3.0-rc3-1-cachyos-rc #2 PREEMPT(full)  ca2d5051c95b910bac0a8f0497b52243cdaa75fa
> [  146.079237] Tainted: [W]=WARN
> [  146.079239] Hardware name: Micro-Star International Co., Ltd. Prestige 16 Flip AI+ C3MTG/MS-2622, BIOS E2622IMS.11A 08/12/2026
> [  146.079242] Call Trace:
> [  146.079247]  <TASK>
> [  146.079253]  dump_stack_lvl+0x61/0x80
> [  146.079267]  usb_reset_device+0x4f/0x2b0
> [  146.079274]  usbdev_ioctl+0x836/0xd80
> [  146.079282]  __x64_sys_ioctl+0x76/0xc0
> [  146.079290]  do_syscall_64+0x100/0x360

The reset was requested by some "fprintd" process with PID 3544.

At any rate, it's userspace doing this for whatever random reason.
Your xhci-hcd dynamic dedug trace doesn't even hint at any USB layer
problems like bad packets, device stalling endpoints, etc.

If you want to konw why it happens, you need to dig in userspace.

Regards,
Michal