Re: USB disconnection after mounting file system

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

On Thu, 9 Oct 2025 15:35:55 +0200, Greg KH wrote:
> On Wed, Oct 08, 2025 at 05:48:05PM -0000, Pierre Tomon wrote:
> > Kernel 6.16.9
> > FS: ext4, does not happen with NTFS.  
> 
> Perhaps ext4 pushes more data to the disk causing it to draw more power
> and things flake out?

It seems to be something weirder than that, because there is a few
minute gap between the last storage traffic and the hub interrupt,
which is indeed disconnection if my Wireshark decoding is correct.

ffff8b7808d86540 959060304 S Bi:6:006:1 -115 13 <
ffff8b7808d86540 959060697 C Bi:6:006:1 0 13 = 55534253 53080000 00000000 00
ffff8b780a96c240 1218406664 C Ii:6:001:1 0:2048 1 = 10
ffff8b780a96c240 1218406695 S Ii:6:001:1 -115:2048 4 <
ffff8b782ae2ac00 1218406713 S Ci:6:001:0 s a3 00 0000 0004 0004 4 <
ffff8b782ae2ac00 1218406731 C Ci:6:001:0 0 4 = a0020100

Potential hypotheses:
1. It is actually *lack* of activity which triggers it.
2. You need to wait a little longer until you see it happen on NTFS,
   then stop worrying about filesystems and software ;)

I too would suggest trying other cables or USB ports (SuperSpeed link
quality sometimes varies from port to port). Or xHCI controllers - I
don't know which one you have, but those with "broken streams" quirk
coincidentally (or not) also tend not to be most reliable, IME.

Regards,
Michal