Public bug reported:

I've got a server that boots off a microSD card connected to a USB reader (HPE 
ProLiant DL380p Gen8, if relevant).
The bootloader (GRUB) and rootfs are both on that microSD card.
The BIOS boots it just fine, GRUB runs and has no issues loading the kernel and 
initrd.
However, once the kernel loads, it doesn't see the microSD card anymore.
As far as I can tell, the reader shows up in `dmesg`, it's just that no block 
device enumerates.
I had to revert to 5.15.0-46 (which is the only other kernel I had installed) 
in order to boot up my server properly.

I've tried different microSD cards and different USB-connected readers
for them, and nothing changed.

** Affects: linux-hwe-5.15 (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1996116

Title:
  5.15.0-52 does not see USB block device

Status in linux-hwe-5.15 package in Ubuntu:
  New

Bug description:
  I've got a server that boots off a microSD card connected to a USB reader 
(HPE ProLiant DL380p Gen8, if relevant).
  The bootloader (GRUB) and rootfs are both on that microSD card.
  The BIOS boots it just fine, GRUB runs and has no issues loading the kernel 
and initrd.
  However, once the kernel loads, it doesn't see the microSD card anymore.
  As far as I can tell, the reader shows up in `dmesg`, it's just that no block 
device enumerates.
  I had to revert to 5.15.0-46 (which is the only other kernel I had installed) 
in order to boot up my server properly.

  I've tried different microSD cards and different USB-connected readers
  for them, and nothing changed.

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux-hwe-5.15/+bug/1996116/+subscriptions


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