Re: [Bug 221721] New: prom21-xhci does not allow to use USB keyboard in plymouth

Hi,

PR for Dracut-ng is now submitted:
https://github.com/dracut-ng/dracut/pull/2491


Sincerely,
Jihong Min

On 7/7/26 18:53, Jihong Min wrote:
> With a little more of thinking, I think this happens due to the
> initramfs building tool not including xhci-pci-prom21.ko when
> xhci-pci.ko is built with the Kconfig where USB_XHCI_PCI_PROM21 was enabled.
> 
> Can you check your initramfs file for whether it holds
> xhci-pci-prom21.ko correctly, or not?
> 
> For example, with dracut, you can do something like:
> cat <<'EOF' | sudo tee /etc/dracut.conf.d/10-xhci-pci-prom21.conf
> # PROM21 xHCI PCI glue is needed before root/LUKS unlock when xhci-pci
> is modular.
> force_drivers+=" xhci-pci-prom21 "
> EOF
> 
> 
> Sincerely,
> Jihong Min
> 
> 
> On 7/7/26 17:03, Thorsten Leemhuis wrote:
>> [Switching to email, hope this will work]
>>
>> Jihong Min, it seems a recent change of yours is causing trouble. See
>> below for details.
>>
>> Side note, but not my area of expertise, so feel free to ignore this, as
>> I might be sending people in the wrong direction and it's just a hunch
>> anyway: wonder if this is another of those situations where the driver
>> needs to be in the initramfs. Tomasz, did you have SENSORS_PROM21_XHCI=m
>> when things were broken? And if yes: have you tried if adding it to the
>> initramfs or setting SENSORS_PROM21_XHCI=y helps?
>>
>> Ciao, Thorsten
>>
>> On 7/4/26 17:41, [email protected] wrote:
>>> https://bugzilla.kernel.org/show_bug.cgi?id=221721
>>>
>>>             Bug ID: 221721
>>>            Summary: prom21-xhci does not allow to use USB keyboard in
>>>                     plymouth
>>>            Product: Drivers
>>>            Version: 2.5
>>>           Hardware: AMD
>>>                 OS: Linux
>>>             Status: NEW
>>>           Severity: low
>>>           Priority: P3
>>>          Component: USB
>>>           Assignee: [email protected]
>>>           Reporter: [email protected]
>>>         Regression: No
>>>
>>> Created attachment 310416
>>>   --> https://bugzilla.kernel.org/attachment.cgi?id=310416&action=edit
>>> output of "sudo lsusb -v"
>>>
>>> Hi,
>>>
>>> After update to 7.2-rc1 I was unable to type in LUKS password in plymouth. I
>>> tried both of my USB keyboards, but both of them just briefly lit up the LEDs
>>> and then seemed to turn off. Bisection pointed to
>>>
>>> commit 364f4a55c661641c02c86a849f0608d8fc3c0006
>>> Merge: e4b4bfaa5090 1c2b66a7d725
>>> Author: Linus Torvalds <[email protected]>
>>> Date:   Mon Jun 22 12:09:47 2026 -0700
>>>
>>>     Merge tag 'usb-7.2-rc1' of
>>> git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
>>>
>>> and then
>>>
>>> commit 9e896b4a48c4e815956d28961448041c80ad5a19 (HEAD)
>>> Author: Jihong Min <[email protected]>
>>> Date:   Tue May 19 09:07:31 2026 +0900
>>>
>>>     usb: xhci-pci: add AMD Promontory 21 PCI glue
>>>
>>> After setting SENSORS_PROM21_XHCI=n and compiling kernel again, I'm able to use
>>> my PC normally.
>>>
>>> CPU: AMD Ryzen 9 9900X
>>> Motherboard: X870I AORUS PRO ICE
>>> Output of "lsusb -v" provided in attachment.
>>>
>>
>