hybrid-graphics-linux team mailing list archive

[Kevin Burns <soulblaze@xxxxxxxxx>]

I'd also like to help out with this. I have an Alienware m11x R1 with switchible intel 4500 and nvidia 335M. 

On Jul 17, 2010, at 2:45 AM, Dave Airlie <airlied@xxxxxxxxx> wrote:

> So I'd really like to finish the _DSM support in nouveau so we can
> actually switch the GPU over on the non-optimus systems.
> 
> There are two things left to do:
> 
> a) figure out what values to pass the DSM method to trigger the MUX,
> It looks like method 0x5 is the one to trigger the mux switch but I've
> no idea yet what values to pass it to trigger the mux switch.
> 
> b) figure out how to get the LVDS DDC lines and make nouveau find the
> panel, at the moment it fails to find the panel when booted and intel
> is in control.
> 
> looking at (a) I expect we could pass a bunch of values to the ACPI
> method possibly using acpi_call to switch the mux and switch it back,
> 
> It looks like passing 0 will return the current toggle status, then
> its a matter of working out which of the top bits are doing what,
> 
>> From reading one DSDT I can see,
> 
> if bit 31 set, then bit 30 is some sort of notify, then bits 25,26,27
> are used to work out some values stored in a TOGF
> 
> otherwise bit 24 is used for something, then bits 12,13,14, and 3,2,1,
> and it stores some values for CRT/LCD/TVout, which may again be
> toggles.
> 
> If someone with the hardware and can use acpi_call it would be nice to
> try and map out some of these things, at least initially a value that
> will turn the Intel LCD off and back on.
> 
> The DSDT I'm using at the moment is attached to bug 16403.
> 
> Dave.
> 
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