http://bugzilla.kernel.org/show_bug.cgi?id=6001
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------- Comment #32 from [EMAIL PROTECTED] 2008-01-18 13:25 -------
(In reply to comment #30)
> Sergio's hang on _DOS=1 was fixed by
> commit a21101c46ca5b4320e31408853cdcbf7cb1ce4ed
> (ACPI: video: _DOS=0 by default to prevent hotkey hang)
>
> But that caused Eric's hang on _DOS=0
>
> both systems are Intel i855GM hardware.
>
> The X guys tell us in no uncertain terms that they do not
> want ACPI switching the display beneath them -- that is
> the job of the native graphics driver. So at this point
> we have no choice but to:
>
> 1. leave DOS=0 the default (good for Sergio, bad for Eric)
> 2. for systems where ACPI display switching works (Eric)
> manually use "echo 1 > /proc/acpi/video/*/DOS"
> as a workaround.
> 3. Wait for X's native drivers to include native display switching.
> I know this is in development -- at least for intel graphics chips --
> but I don't know how far along it is.
>
> closed as DOCUMENTED.
My HP 6710B also crashes when DOS=0, DOS=1,2 or 3 works just fine though. This
has an GM965 intel chipset. What does the ACPI spec say about values other then
0 or 1 ?
It seems that the change that was done from 1 to 0 causes some quit bad
regressions on some laptops, while fixing others. Otoh all reporters say that
DOS=2 works..
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