[xorg-bugzilla-noise] [Bug 1538] New: Only black signal on DFP with i845G

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Tue Oct 5 13:14:10 UTC 2004

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           Summary: Only black signal on DFP with i845G
           Product: xorg
           Version: 6.8.1
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Driver/i810
        AssignedTo: xorg-bugzilla-noise at freedesktop.org
        ReportedBy: piel at lifl.fr


I have a i845G with an ADD card for DVI output. Xorg 6.7.0 used to work with the
DVI output (without any particular configuration), at least as long as the
computer was booted with DVI as output. With Xorg 6.8.1, the output to DVI (DFP)
is completly black (even if there is a signal with the correct size and refresh
rate). It would be much more convenient if I could *really* see the picture, as
what happen when I boot with VGA (CRT).

To be more detailed:
* If I boot on DVI: everything works (including the VESA framebuffer) until X
starts and then everything is black (even the VTs). I can successfully select
the CRT, DFP or both outputs but they *all* give black signals (using the
"MonitorLayout" option).

* If I boot on VGA: only VGA works. It always works but it is not possible to
select anything else than CRT.

Following are my xorg.conf and two logs (one for boot on DFP and the other one
for boot on CRT).

BTW, I know that this chipset doesn't supprot dualhead, but could this bug be
related to bug #1064 ? The error messages seem similar.        
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