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====== Dell Optiplex 3070 ======

----
The Dell Optiplex with Debian 13 throws the following BIOS related errors in the journal:

  -   PCIe ASPM error: AER: Correctable error message received from 0000:02:00.0
  -   ACPI Error: AE_NOT_FOUND, while evaluating GPE method [_L6D]

The following paragraphs describe possible solutions.

===== ASPM errors BIOS =====
Power saving errors in journalctl:

  pcieport 0000:00:1d.0: AER: Correctable error message received from 0000:02:00.0
  nvme 0000:02:00.0: PCIe Bus Error: severity=Correctable, type=Physical Layer, (Receiver ID)
  nvme 0000:02:00.0:   device [1344:5410] error status/mask=00000001/00002000
  nvme 0000:02:00.0:    [ 0] RxErr                  (First)

=== Option 1 ===
This worked to remove the error and gave the lowest power usage (4 Watt).
Add extra kernel boot parameter: pcie_aspm=off, acpi_mask_gpe=0x6d into /etc/default/grub.
  * pcie_aspm=off : Let BIOS manage ASPM for pcie bus avoiding "pcieport 0000:00:1d.0: AER: Correctable error message"
  * acpi_mask_gpe=0x6d  :  Suppress "ACPI Error: AE_NOT_FOUND, while evaluating GPE method [_L6D]"

  # nano /etc/default/grub
  
  GRUB_CMDLINE_LINUX_DEFAULT='quiet pcie_aspm=off acpi_mask_gpe=0x6d resume=UUID=40794123-1105-4c1
  
  # update-grub

=== Option 2 ===
This also worked to remove the error, but gave a slightly higher power usage (7 Watt) than Option 1.
Solved by disabling ASPM on bridge and/or drive:

  # Disabling ASPM on bridge
  /usr/bin/setpci -s 00:1d.0 0x50.B=0x40
  
  # Disabling ASPM on nvme drive
  /usr/bin/setpci -s 02:00.0 0x90.B=0x40

This can be achieved by creating a specific systemctl service (aspm-overrule.service).

===== ACPI errors BIOS =====
Getting rid of ACPI error:
<code>
# kernel: ACPI Error: AE_NOT_FOUND, while evaluating GPE method [_L6D] (20240827/evgpe-511)
# kernel: ACPI BIOS Error (bug): Could not resolve symbol [\_SB.PCI0.GLAN.GPEH], AE_NOT_FOUND (20240827/psargs-332)
# kernel: ACPI Error: Aborting method \_GPE._L6D due to previous error (AE_NOT_FOUND) (20240827/psparse-529)
</code>
==== Option 1 ====
Create service with: 
  /usr/bin/echo "disable" > /sys/firmware/acpi/interrupts/gpe6D
This works but +/-30 seconds after boot this entry is being overwritten again to "enabled".
It is not clear what is doing this

==== Option 2 ====
Adding the 'acpi=off' option to grub did not suppress these errors. 
But adding 'acpi_mask_gpe=0x6d' seems to work.

  # nano /etc/default/grub
    GRUB_CMDLINE_LINUX_DEFAULT='quiet acpi_mask_gpe=0x6d' 
  # update-grub