Hi!

Here are some of the changes in dmesg output between (nearly) the same
kernel as 4.99.41 and 4.99.42:

-acpi0: using Intel ACPI CA subsystem version 20060217
-acpi0: X/RSDT: OemId <Nvidia,AWRDACPI,42302e31>, AslId <AWRD,00000000>
+acpi0: using Intel ACPI CA subsystem version 20070320
+acpi_pci_link: WARNING: powerhook_establish is deprecated
+acpi_pci_link: WARNING: powerhook_establish is deprecated
+acpi_pci_link: WARNING: powerhook_establish is deprecated
+acpi_pci_link: WARNING: powerhook_establish is deprecated
+acpi_pci_link: WARNING: powerhook_establish is deprecated
+acpi_pci_link: WARNING: powerhook_establish is deprecated
+acpi_pci_link: WARNING: powerhook_establish is deprecated
+acpi_pci_link: WARNING: powerhook_establish is deprecated
+acpi_pci_link: WARNING: powerhook_establish is deprecated
+acpi_pci_link: WARNING: powerhook_establish is deprecated
+acpi_pci_link: WARNING: powerhook_establish is deprecated
+acpi_pci_link: WARNING: powerhook_establish is deprecated
+acpi_pci_link: WARNING: powerhook_establish is deprecated
+acpi_pci_link: WARNING: powerhook_establish is deprecated
+acpi_pci_link: WARNING: powerhook_establish is deprecated
+acpi_pci_link: WARNING: powerhook_establish is deprecated
+acpi_pci_link: WARNING: powerhook_establish is deprecated
+acpi_pci_link: WARNING: powerhook_establish is deprecated
+acpi_pci_link: WARNING: powerhook_establish is deprecated
...
+com0: WARNING: powerhook_establish is deprecated

The com0 one probably just means that com0 ("com0 at isa0 port
0x3f8-0x3ff irq 4: ns16550a, working fifo") hasn't been converted to
the pmf framework yet.

Why the many acpi_pci_link messages?

Cheers,
 Thomas