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Bug#572664: iwlagn driver is no longer able to manage Intel 5100 AGN wireless controller



On Sat, 2010-03-06 at 12:41 +0100, Wouter Verhelst wrote:
> On Fri, Mar 05, 2010 at 05:41:34PM +0000, Ben Hutchings wrote:
> > On Fri, Mar 05, 2010 at 04:51:55PM +0100, Wouter Verhelst wrote:
> > [...]
> > > ** Tainted: W (512)
> > >  * Taint on warning.
> > [...]
> > 
> > Please send the warning messages.
> 
> Whoa. I hadn't even noticed that.
> 
> [    0.000000] ------------[ cut here ]------------
> [    0.000000] WARNING: at /build/buildd-linux-2.6_2.6.32-8-amd64-DCxXqz/linux-2.6-2.6.32/debian/build/source_amd64_none/drivers/pci/dmar.c:616 check_zero_address+0x91/0x19b()
> [    0.000000] Hardware name: HP Compaq 2230s (FU312EA)
> [    0.000000] Your BIOS is broken; DMAR reported at address zero!
[...]
> Now it is true that around the time when things first got wrong, my BIOS
> had been reset due to the battery running out when I was using the
> laptop. I had almost forgotten, also because everything seemed to work
> fine after the reboot, and didn't connect the dots until just now.
> 
> I'll do a reflash of my BIOS and see whether that fixes things. Will let
> you know what the result is.

'Your BIOS is broken' means the BIOS provided has provided an invalid
ACPI table.  This is likely a bug, not the result of any corruption.  So
far as I can see the warning is actually harmless; DMAR will simply be
disabled.  DMAR is a generic name for what Intel calls VT-d.  It may be
that there is a BIOS option to disable/enable this and enabling it will
result in a valid ACPI table.

The iwlagn problem is unrelated to this warning.  I will forward your
report to the linux-wireless list.

Ben.

-- 
Ben Hutchings
Q.  Which is the greater problem in the world today, ignorance or apathy?
A.  I don't know and I couldn't care less.

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