Masquerading operating systems (with ACPI_OS_NAME) does cause grief.

Masquerading operating systems (with ACPI_OS_NAME) does cause grief.

[Barry Kitson]

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?

For the info of anyone stumbling over this message with a EPIA
suspend/resume problems, setting "acpi_os_name=Linux" in the boot
parameters (e.g. in /etc/lilo.conf, add a line
append="acpi_os_name=Linux") may help you too.  On the CL10000, it's not
necessary to remove usb or rhine modules, and networking seems to resume
nicely. If you want to see anything interesting on a monitor connected
to the VGA port, you're overly optimistic.

Have fun,

Barry.






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

[Matthew Garrett]

On Sun, 2005-01-09 at 23:40 +1000, Barry Kitson wrote:

> 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.  

It'd be good to see the DSDT, so we can try to work out why it makes a
difference.

-- 
Matthew Garrett | mjg59-1xO5oi07KQx4cg9Nei1l7Q@public.gmane.org



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

[Bruno Ducrot]

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

[Moore, Robert]

Another thing to keep in mind is that on many, many machines, "Microsoft
Windows NT" or similar is essentially the only tested code path.



> -----Original Message-----
> From: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org [mailto:acpi-devel-
> admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org] On Behalf Of Bruno Ducrot
> Sent: Monday, January 10, 2005 7:03 AM
> To: Barry Kitson
> Cc: acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
> Subject: Re: [ACPI] Masquerading operating systems (with ACPI_OS_NAME)
> does cause grief.
> 
> 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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