Re: Masquerading operating systems (with ACPI_OS_NAME) does cause grief.

[Bruno Ducrot <ducrot-kk6yZipjEM5g9hUCZPvPmw@public.gmane.org>]

On Sun, Jan 09, 2005 at 11:40:52PM +1000, Barry Kitson wrote:
> The following messages ....
> http://sourceforge.net/mailarchive/message.php?msg_id=9558174
> http://sourceforge.net/mailarchive/message.php?msg_id=9559475
> suggest that there are no known problems resulting from pretending your
> favourite OS is something it's not.  Well, bad news.....
> 
> Please note that (modulo VGA, which has it's own special set of
> problems) the only string (prefix) that causes suspend/resume of linux
> 2.6.10 to fail on a VIA EPIA CL10000 Mini-ITX motherboard (with either
> of the two available BIOS versions - 1.16 or 1.23) is the newish (but
> not entirely accurate) default of ACPI_OS_NAME="Microsoft Windows NT".
> When Linux declares itself to be NT, resumes just don't happen.  The fan
> and power supply wake up, but that's about all.  
> 
> Are we really sure this value of ACPI_OS_NAME should be the default?
> Could I suggest a return to "truth" as a default, with prominent
> suggestions within the documentation of what lies to try when the truth
> fails?

Was done by testing by Bob IIRC and showed that this give less errors
than having set it to "Linux".  "Linux" is not present for all DSDT Ive
seen so far (well, actually Ive seen a IBM laptop, don't remember the
model though).  It's then good to atleast set _OS to "something well knows".

It turns out that "Microsoft Windows NT" is for now "better", but this
may be not true for everybody.
Note also that ACPICA support the _OSI stuff, so its not Windows NT but
another Windows IIRC (I don't remember which one).

You may therefore try to pass the kernel option "acpi_osi="
to see if that's help (especially if a grep _OSI file.asl is positive)
before overriding acpi_os_name.


-- 
Bruno Ducrot

--  Which is worse:  ignorance or apathy?
--  Don't know.  Don't care.


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