LCA: Updates on the X Window System
Posted Jan 23, 2007 1:48 UTC (Tue) by neilbrown
In reply to: LCA: Updates on the X Window System
Parent article: LCA: Updates on the X Window System
My understanding from Keith's talk at LCA is that the Intel graphics chip
doesn't actually control mode setting at all. It somehow leaves that for
some other glue chip that the motherboard manufacturer needs to provide.
(Apparently this is similar to the AC97 sound architecture where the
analogue bits were not in the Intel chipset, only the digital bits).
The interface to these mode-setting glue chips is not standardised
so everybody does it differently. So for Xorg to be able to do
mode setting, it with has to know about how all the different glue
chips work (Which is what the new mode-setting branch of the driver tries)
or it needs help from the VBIOS (which is what the 'stable' branch does).
So maybe it is Intel's fault for not standardising the interface properly,
and very likely it is Intel's fault if you have an Intel motherboard, but
the situation doesn't seem to be as straight forward as one might like it to be.
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