Kohjinsha SH8 "BIOS _OSI(Linux) query ignored"

Reporting as requested by dmesg:

[    0.166001] ACPI: BIOS _OSI(Linux) query ignored
[    0.166017] ACPI: DMI System Vendor: KOHJINSHA CO.,LTD.
[    0.166026] ACPI: DMI Product Name: SH series
[    0.166035] ACPI: DMI Product Version: Not Applicable
[    0.166044] ACPI: DMI Board Name: S37
[    0.166052] ACPI: DMI BIOS Vendor: Phoenix Technologies LTD
[    0.166062] ACPI: DMI BIOS Date: 08/30/07
[    0.166070] ACPI: Please send DMI info above to [email protected]
[    0.166082] ACPI: If "acpi_osi=Linux" works better, please notify 

[email protected]

Debian sid, kernel 2.6.25-2 .
"acpi_osi=Linux" not attemped (what would "work better" ?).

Side note: battery information is not available via /proc/acpi, though detected during boot:

[   14.638146] ACPI: Battery Slot [BAT0] (battery present)

It was available in 2.6.24, disapeared since 2.6.25.

--
Vincent Pelletier