Dual-head on ATI Mobility (Acer laptop)

[Chris COOPER]

Hiya,
 
On a fresh Fedora (Yarrow) install on an Acer TravelMate 735 everything
was sweet and working.
 
Under the GUI 'Display' was dual-head - ability to display different
image on the laptop LCD and external VGA port.
 
Once this 'Dual Head' option was enabled the X-server now fails to start
with
 
'(EE) ATI: XF86Config Device sections "Videocard0" and "Videocard1" may
not be assigned to the same adaptor"
 
XF86Config lists
 
Section "Device"
            Identifier            "Videocard0"
            Driver                "ati"
            VendorName     "Videocard vendor"
            BoardName       "ATI Rage Mobility"
EndSection
 
Repeated again for 'Videocard1' with an additional parameter of 
            BusID               "PCI:1:1:0"
 
Quick check of /proc/pci indicates that there's only the one BusID
available.
 
I've tried adding BusID to both device sections and 'Screen 1' to the
latter device, in an attempt to convince the ATI driver I really do want
to refer to the same adaptor.
 
Any suggestions?
 
>From a user perspective, pity a single checkbox broke things in an
unfriendly way (I can put things back but not so for many point'n'click
users)
 
Regards,
Chr!s
 
 
PS: Lots of similar postings, however most are regarding two display
adaptors. This woks fine in WinXP, 98 etc
 
PPS: Actualy only one glitch - mic is enabled by default - which is
fine, but mic output is (unfortunately) also enabled making for
excellent feedback on a laptop.
 
Chr!s Cooper                                 c.cooper at ecu.edu.au 
Edith Cowan University                       Mobile:     +61 4 0910 3531

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