[ILUG] Xinerama / multi-head on Dell Inspiron 4000

[Niall O Broin]

Having discovered to my pleasant surprise that the hardware on my Dell
Inspiron 4000 supports two independent displays i.e. the LCD and the
external VGA can display two entirely different things (works from 'doze
just like I first used such a feature on a Mac sometime last century). I'd
now like to get this working under X so I'm reading the Xinerama HOWTO and I
get as far as running

XFree86 -scanpci

which gives the following

Probing for PCI devices (Bus:Device:Function)
 
(0:0:0) Intel i815 Bridge
(0:1:0) unknown chip (DeviceId 0x1131) from Intel
(0:30:0) unknown chip (DeviceId 0x2448) from Intel
(0:31:0) unknown chip (DeviceId 0x244c) from Intel
(0:31:1) Intel unknown card (0x4541) using an unknown chip (DeviceId 0x244a) from Intel
(0:31:2) Intel unknown card (0x4541) using an unknown chip (DeviceId 0x2442) from Intel
(1:0:0) unknown card (0x1028/0x00a4) using a ATI Rage 128 Mobility MF
(2:3:0) unknown card (0x1028/0x00a4) using an unknown chipset(0x125d/0x1998)
(2:6:0) unknown chipset(0x1668/0x0100)
(2:15:0) unknown chip (DeviceId 0xac42) from Texas Instruments
(2:15:1) unknown chip (DeviceId 0xac42) from Texas Instruments
(2:15:2) unknown card (0x1028/0x00a4) using an unknown chip (DeviceId 0x8027) from Texas Instruments
(8:4:0) unknown card (0x1668/0x1100) using a Intel 82557/8/9 10/100MBit network controller
(8:8:0) unknown card (0x1668/0x2400) using an unknown chipset(0x11c1/0x0448)

Obviously 1:0:0 is my LCD - it's identified as ATI and it's the BusID used
in my X config file. But what's the other video device ? My bet's on 2:3:0
because of the same unknown card identifier (0x1028/0x00a4) but I'd hate to
start sending VGA chipset programming commands to e.g. my touchpad :-)

The ideal answer here is from someone who's done exactly this with the same
hardware :-) but a step in the right direction would be good too.




Niall