hybrid-graphics-linux team mailing list archive

[Albert Vilella <avilella@xxxxxxxxx>]

Just to gather a few more details, if you call:

echo '\_SB.PCI0.P0P4.DGPU.DON' > /proc/acpi/call

before leaving Linux and rebooting into Windows,
does it behave normally back into Optimus-mode in Windows?



On Wed, Dec 22, 2010 at 1:27 PM, Raphael Metzler <raphdev@xxxxxxxxxxxxxx> wrote:
> Hi,
>
> I also managed to power Ion down using \_SB.PCI0.P0P4.DGPU.DOFF
> The problem is this GraphicsSwitch Utility. Every time Linux is
> booted, the "Optimus" setting is somehow lost meaning
> - if you boot into Win7 again, your netbook will be in ION-only mode
> meaning you have to reboot to use Win7 in Optimus-mode properly
> - if you boot Linux second time, intel chip is hidden (lspci) and you
> can only use ion (no way to power it down, here)
>
> I really do not understand what this tool is doing. Does it write to
> bios and simply change a flag? But why the hell is linux overwriting
> this flag?
> Does it do something with the efi-partition?
> Maybe the next thing to do is to reverese engineer this application.
>
> Thing is, with all this required rebooting, this netbook is pretty
> useless for me as I need it both for windows and linux :(
> I hope we can make any progress with this Switch Utility issue soon
> because else I'm thinking about exchanging this nb :(
>
> Thanks to the whole team for all your work!
>
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