New subject: [Bug 21388] Dual monitor setup results in blank screen on CRTC1

24 Apr 2009

      http://bugs.freedesktop.org/show_bug.cgi?id=21388

           Summary: Dual monitor setup results in blank screen on CRTC1
           Product: xorg
           Version: unspecified
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Driver/radeonhd
        AssignedTo: lverhaegen@suse.de
        ReportedBy: pht@spatium.org
         QAContact: xorg-team@lists.x.org

Created an attachment (id=25111)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=25111)
xorg config

I have a dual monitor setup (see attached files); the problem is that the
secondary monitor (connected to dvi2) stays black. Note that these are CRT
monitors. It switches to correct mode, thus is not out of range, I can verify
that via the OSD menu. I can even switch it to different modes using xrandr,
but it stays black. It is not a hardware issue, dual monitors work okay in the
other operating system. The theory is that CRTC1 is not properly initialized or
operated. This is backed up by the fact that when the first (ie. working)
monitor is plugged out before starting X, the other monitor (ie. blank) is
working, and when the former first monitor is plugged back and activated via
xrandr, it stays black.

I experienced a brief moment a working setup, which went as follows: the X
server was first configured to run with the radeon driver, then it was shut
down, then the radeonhd driver was configured. This setup resulted in both
monitors working. After shutting down X again, all was back to previous state,
as described above.

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[Bug 21388] New: Dual monitor setup results in blank screen on CRTC1

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