<!-- @page { margin: 2cm } P { margin-bottom: 0.21cm } A:link { so-language: zxx } --> <!-- @page { margin: 2cm } P { margin-bottom: 0.21cm } A:link { so-language: zxx } -->
Yep no support from for switchable chips under linux see http://wiki.cchtml.com/index.php/Features.
I have a AMD Phenom HP laptop with an ATI 4200 and an ATI 5650 and the fglrx drivers cannot be switched. If you dig around you will see that someone forced the drivers to switch, but it failled due to the driver picking up the wrong BIOS ROM.
An alternative approach is to use the ACPI to set the device type at boot using the ACPI _SPD method – at least I think thats the theory. However according to my DSDT.dsl my cards do not have this method. If you haven't done so already have a search on DSDT.dsl and on ACPispec. Also, you have probably read this it contains some useful info on sending ACPI commands.
http://linux-hybrid-graphics.blogspot.com/2010/07/using-acpicall-module-to-switch-onoff.html
In other news... the open source drivers can be switched, but I the performance I got from the 5650 was quite poor.
As this is closed source we can do little else than hope AMD ATI decide to beat the competition to be the first to support switchable graphics in linux. As you can see so far no one from AMD ATI has even mentioned that they are even considering looking into this.