Not sure the serio message is relevant. Interestingly the journal also
contains a 5.4 boot which has the same. There is a more serious problem
even before.

inspiron-5480-c1-201807-26321 kernel: WARNING: CPU: 2 PID: 369 at
mm/page_alloc.c:4975 __alloc_pages_nodemask+0x268/0x300

This is caused by dell_wmi_sysman requesting an allocation which is
beyond the allowed order. The date seems to come directly from the bios.
None of that happens for the 5.11.0-34 kernel. Though we had feedback
that on the same hardware we do not get issues running the same kernel
version on hirsute (the kernel then is also built in hirsute space).

The allocation failure seems to lead to a crash later on (still part of
loading the dell-wmi-sysman module. There was one change in the kernel
which addresses how ACPI attributes are treated:

41a8457f3f6f "ACPI: DPTF: Fix reading of attributes"

However there seems to be no follow-up yet on it upstream. Nor seems the
same change that is also present in the parent hirsute:linux kernel to
be causing issues for hirsute. IT still could be a compiler issue
because the hwe-5.11 kernel is compiled in focal user-space. Therefor it
would be interesting to see whether the parent hirsute kernel, when
installed under focal user-space is also showing problems or not.

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https://bugs.launchpad.net/bugs/1943913

Title:
  touchpad and keyboard are not working in 5.11.0-35

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