Here's the relevant entry from the X.org man page:
BusID "bus-id"
This specifies the bus location of the graphics card. For
PCI/AGP cards, the bus-id string has the form
PCI:bus:device:function (e.g., “PCI:1:0:0” might be appropriate
for an AGP card). This field is usually optional in single-head
configurations when using the primary graphics card. In multi-
head configurations, or when using a secondary graphics card in
a single-head configuration, this entry is mandatory.
Put simply it's not a bug but the way it works. Maybe we should mark it
as wishlist? (I would like this to be fixed too)
--
Laptops with hybrid graphics fail to boot to X unless a BusID is specified
https://bugs.launchpad.net/bugs/304445
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