Missing or incompletely supported functionality in /proc/acpi
May be a buggy DSDT.

/sys/firmware/acpi/tables/DSDT
/sys/firmware/acpi/tables/OEMB

"ASL is compiled into AML images." 
https://www.acpica.org/downloads

# SSDT_FILES=`ls /sys/firmware/acpi/tables/ | grep SSDT`
# for file in $SSDT_FILES ; do cat "/sys/firmware/acpi/tables/$file" > 
"$file.dat"; done
# cat /sys/firmware/acpi/tables/DSDT > DSDT.dat

To decompile

$ iasl -d DSDT.dat
$ iasl -d SSDT*.dat

"Old and historical" acpi.sourceforge.net" 
"http://acpi.sourceforge.net/dsdt/index.php";
"https://www.intel.com/content/www/us/en/design/resource-design-center.html";

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https://bugs.launchpad.net/bugs/1892547

Title:
  [    0.172384] ACPI Exception: Could not find/resolve named package
  element: OC06 (20170831/dspkginit-381) [    0.172444] ACPI Exception:
  Could not find/resolve named package element: OC07
  (20170831/dspkginit-381)

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