hp-wmi: reading hddtemp results in ACPI errors

On my HP 2510p notebook I get five ACPI errors when the hp-wmi driver attempts to read hddtemp.

$ cat /sys/bus/platform/devices/hp-wmi/hddtemp
cat: /sys/bus/platform/devices/hp-wmi/hddtemp: Invalid argument

In dmesg this results in:
ACPI Exception (exoparg2-0445): AE_AML_PACKAGE_LIMIT, Index (000000002) is beyond end of object [20090320]
ACPI Error (psparse-0537): Method parse/execution failed [\_TZ_.C2FA] (Node ffff88007e042420), AE_AML_PACKAGE_LIMIT
ACPI Error (psparse-0537): Method parse/execution failed [\_SB_.C2BB.C2D9] (Node ffff88007e040180), AE_AML_PACKAGE_LIMIT
ACPI Error (psparse-0537): Method parse/execution failed [\_SB_.C2BB.C2D0] (Node ffff88007e01efc0), AE_AML_PACKAGE_LIMIT
ACPI Error (psparse-0537): Method parse/execution failed [\_SB_.C2BB.WMAA] (Node ffff88007e040120), AE_AML_PACKAGE_LIMIT

Would it be possible to improve the driver to prevent these errors?

Somewhat related, the value of 'display' seems rather strange:

$ cat /sys/bus/platform/devices/hp-wmi/display
65795
Any idea if that's correct or not and what the meaning of that value is?

Cheers,
FJP