multiple video cards error

Alex Deucher alexdeucher at
Tue Mar 9 17:48:50 PST 2010

2010/3/9 truename <harry_hao at>:
> There are four PCI video cards on the mainboard. They are the same with each
> other. I have written the driver myself running in XFree86 4.2.0. The four
> video cards work fine in Redhat 7.0 when setting "xinerama" in the config
> file.
> Then I upgrade the driver in order to run in Xorg 1.6.4. The new driver can
> only make the primary video card work fine in Ubuntu 9.10(XServer version is
> 1.6.4) . But it cannot make four video cards work fine at the same time when
> setting "xinerama" in the config file. In the log I find that it can read
> rom of the primary video card. But it cannot read roms of the other video
> cards. The Xserver reports an error:
> Cannot read V_BIOS (3) Input/output error
> The driver cannot read or write I/O ports except the primary video card.
> Any comments on this question would be appreciated.

Multiple cards only work in xserver 1.4 or earlier or 1.7 or newer.


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