ACPI BIOS Errors and Slow Boot on HP EliteBook 830 G6 (Ubuntu 24.04.2 LTS)

[Shaikh_Muhammad]

Dear HP Support,

I have recently installed Ubuntu 24.04.2 LTS on my HP EliteBook 830 G6, and I'm encountering persistent ACPI BIOS errors along with a significantly slower boot time compared to Windows.

Issue Summary:

• On Windows, the system boots in around 15 seconds, but on Ubuntu, it takes more than 45 seconds, even after updating to the latest R70 BIOS.

• I ran a diagnostic using the command sudo dmesg | grep -i "error" and found the following ACPI-related errors very early in the boot process:
  
  [ 0.407651] ACPI BIOS Error (bug): AE_AML_BUFFER_LIMIT, Field [CAP1] at bit offset/length 64/32 exceeds size of target Buffer (64 bits) (20240322/dsopcode-198)
  [ 0.407713] ACPI Error: Aborting method \_SB._OSC due to previous error (AE_AML_BUFFER_LIMIT) (20240322/psparse-529)
  [ 0.677226] ACPI BIOS Error (bug): AE_AML_PACKAGE_LIMIT, Index (0x000000005) is beyond end of object (length 0x5) (20240322/exoparg2-393)
  [ 0.677273] ACPI Error: Aborting method \_TZ.GETP due to previous error (AE_AML_PACKAGE_LIMIT) (20240322/psparse-529)
  [ 0.677282] ACPI Error: Aborting method \_TZ.CHGZ._CRT due to previous error (AE_AML_PACKAGE_LIMIT) (20240322/psparse-529)
  [ 0.678407] ACPI BIOS Error (bug): AE_AML_PACKAGE_LIMIT, Index (0x000000005) is beyond end of object (length 0x5) (20240322/exoparg2-393)
  [ 0.678446] ACPI Error: Aborting method \_TZ.GETP due to previous error (AE_AML_PACKAGE_LIMIT) (20240322/psparse-529)
  [ 0.678454] ACPI Error: Aborting method \_TZ.CHGZ._CRT due to previous error (AE_AML_PACKAGE_LIMIT) (20240322/psparse-529)
  
  These appear to be related to malformed or unsupported ACPI tables being exposed by the firmware, which the Linux kernel is unable to parse properly. As a result, power and thermal management may not be functioning correctly, and the system remains unstable at times.