Slow boot

[L_V]

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# dmesg | grep 258a

+ if you have another keyboard to try....
+

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lsmod | grep usb

[dragonball]

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 sudo dmesg | grep 258a
[sudo] password for george:
[  124.172180] usb 1-3: New USB device found, idVendor=258a, idProduct=001f, bcdDevice= 6.27


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george@Debian:~$ lsmod | grep usb
usbhid                 57344  0
hid                   135168  2 usbhid,hid_generic
usbcore               290816  3 xhci_hcd,usbhid,xhci_pci
usb_common             16384  1 usbcore

[L_V]

something around xhci_hcd
I have this

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usbcore               290816  8 ohci_hcd,ehci_pci,usbnet,usbhid,rndis_host,ehci_hcd,ohci_pci,cdc_ether
usb_common             16384  1 usbcore

+

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find /etc/modprobe.d/ -type f -exec grep -v "#" {} \;

[dragonball]

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find /etc/modprobe.d/ -type f -exec grep -v "#" {} \;
alias char-major-195* nvidia
blacklist microcode


[L_V]

Something around USB 3.0.
For testing/investigation, I would blacklist xhci_hcd , and load ohci_hcd ehci_hcd in /etc/initramfs-tools/modules.

Can you try

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sudo modprobe ohci_hcd
sudo modprobe ehci_hcd
sudo modprobe -r xhci_hcd
lsmod | grep usb

risk of necessary hard reboot , but cannot test for you !

+ maybe some BIOS investigation about USB

[dragonball]

Small progress

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lsmod | grep usb
usbhid                 57344  0
hid                   135168  2 usbhid,hid_generic
usbcore               290816  5 xhci_hcd,ohci_hcd,usbhid,ehci_hcd,xhci_pci
usb_common             16384  1 usbcore

But still cannot disable xhci_hcd.

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george@Debian:~$ more /etc/modprobe.d/blacklist.conf
blacklist xhci_hcd


Also this are my bios settings but disabling XHCI Hand-off didn't change anything

[L_V]

Then.....

For testing/investigation, I would blacklist xhci_hcd , and load ohci_hcd ehci_hcd in /etc/initramfs-tools/modules.

Do you know how to do this ?
/!\ this is at risk if you don't know how to recover.
Then, don't do it if not familiar with.

[dragonball]

The first step I found it. I add this lines in /etc/initramfs-tools/modules

ohci_hcd
ehci_hcd

After that i updated initramfs with

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update-initramfs -u

But I cannot blacklist xhci_hcd

[L_V]

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lsinitramfs /initrd.img | grep "etc/modprobe.d/"
cat /etc/modprobe.d/blacklist.conf

[dragonball]

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lsinitramfs /initrd.img | grep "etc/modprobe.d/"
etc/modprobe.d/blacklist.conf
etc/modprobe.d/dkms.conf
etc/modprobe.d/intel-microcode-blacklist.conf
etc/modprobe.d/nvidia-blacklists-nouveau.conf
etc/modprobe.d/nvidia-kernel-common.conf
etc/modprobe.d/nvidia.conf

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george@Debian:~$ cat /etc/modprobe.d/blacklist.conf
blacklist xhci_hcd

[L_V]

Strange ... I'm a bit short in idea.....
To make a dirty blacklist, there is a straight one.....

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### !!! dirty test - don't do it, or only if you decide to do it !!! ###
mv /lib/modules/$(uname -r)/kernel/drivers/usb/host/xhci-hcd.ko /lib/modules/$(uname -r)/kernel/drivers/usb/host/xhci-hcd.ko.bak

... even not sure this is enough in your case, because probably in the kernel and the target is to prevent xhci-hcd at boot.
+ to see

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lsusb -t

+ you can try to add this as kernel option

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modprobe.blacklist=xhci_hcd

or this one....

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intel_iommu=off

or this one....

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iommu=soft