Zaist: The mga_hal error you've got is generated if the driver decides
it needs the HAL using this macro:
#define MGA_DH_NEEDS_HAL(x) (((x)->Chipset == PCI_CHIP_MGAG400) && \
((x)->ChipRev < 0x80))
In other words for some revisions of the MGA 400 chip family you need to
use the binary mga_hal module to make dualhead mode work. My system
uses an MGA 550 so it doesn't need one. I have no idea where you would
get the mga_hal from or what you'd do with it, I just know it's a binary
blob you need to get from whoever wrote the mga driver.
--
Xinerama broken since intrepid on MGA
https://bugs.launchpad.net/bugs/292214
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