ACPI BIOS Error (bug): AE_AML_PACKAGE_LIMIT, Index (0x0000000FF) is beyond end o

Hello,

I've got a Dell G3 (3579) bought new with an Ubuntu 16.04LTS version installed.

It worked flawlessly, but I've to upgrade it to 19.10 version and next to 20.04LTS. As you may know, Dell inhibited distributions upgrades, but this is easy to bypass. So I upgraded to 18.04 LTS and then to 19.10.

Since then, I've got this acpi error :

ACPI BIOS Error (bug): AE_AML_PACKAGE_LIMIT, Index (0x0000000FF) is beyond end of object (length 0x11) (20190703/exoparg2-393)

When I do some disk activity (like during a backup) the machine freeze, mouse cursor stopping and machine becoming unresponsive for many seconds. This happens when iowait is above 25% ... So very annoying.

I tried, first, to upgrade the BIOS to the latest version, but to no avail.

I searched all that I could without luck.

So all the help I could get will be appreciated and thanked !

Thanks a lot in advance for your help.

Stay safe.