take a look at the new radeon man page.  You might try adding the
option "MonitorLayout"

from the man page:

Option "MonitorLayout" "string"

    This option is used to overwrite the detected monitor types. This
is only required when driver makes a false detection. The possible
monitor types are:
    NONE -- Not connected
    CRT -- Analog CRT monitor
    TMDS -- Desktop flat panel
    LVDS -- Lapto flat panel
    This option can be used in following format:
    Option "MonitorLayout" "[type on primary], [type on secondary]"
    For example, Option "MonitorLayout" "CRT, TMDS"

    Primary/Secondary head for dual-head cards:
    (when only one port is used, it will be treated as the primary
regardless)
    Primary head:
    DVI port on DVI+VGA cards
    LCD output on laptops
    Internal TMDS prot on DVI+DVI cards
    Secondary head:
    VGA port on DVI+VGA cards
    VGA port on laptops

    External TMDS port on DVI+DVI cards

    The default value is undefined. 

------------------

I have a system running XFree86 4.3 and a Radeon 7500 VE dual head
card.  I'm running \
the heads using Xinerama.  I can't get to that box right now, so I
can't include the \
config files.  For some reason, this box randomly locks up or reboots. 
I think it's \
probably the video card/drivers, but I don't know since I can't make it
happen \
consistently.  I'm pretty familiar with Linux, but I don't know much
about X.

Are there any known issues with the Radeon drivers locking up in 4.3? 
I can't find \
anything that matches this problem in Bugzilla.

I tried to update to the CVS drivers built by Alan Hourihane.  When I
replace the \
XFree86 and radeon_drv.o files and try to start X, all I get are blank
monitors.  I \
can back out of X with ctrl+alt+backspace, but the screens stay off.  I
usually have \
to shutdown blindly at this point and switch the file back to get
things working \
again.  Can anyone give me an idea of what I'm doing wrong here?

Thanks.

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