[Bug 21604] New: r630: Second screen doesn't get signal in dual head mode

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Wed May 6 14:41:46 PDT 2009


           Summary: r630: Second screen doesn't get signal in dual head mode
           Product: xorg
           Version: git
          Platform: x86 (IA32)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: mvirkkil at cc.hut.fi
         QAContact: xorg-team at lists.x.org

Created an attachment (id=25572)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=25572)
Xorg log

Card: Sapphire HD 2600 Pro AGP

xorg.conf contains the following options:
        Option  "BusType" "PCIE"
        Option "ExaNoDownloadFromScreen" "True"

It has three physical connectors: DVI, VGA and S-Video. 

I have the first screen connected using DVI and the second screen connected
using VGA. 

xorg recognizes both screens correctly and gets the right modes from the

In "clone mode" (aka "mirror mode") both screens work and show the same image
without issue.

When trying to use the screens in a dual head setup side by side, only one
display gets a signal, the other display turns off. From a software point of
view everything seems to work: the desktop correctly expands to both screens
and  xrandr reports that both screens are in to correct modes. The only issue
is that in reality, the second monitor has turned it self off.

By only enabling either one monitor, the single monitor works, and the one
which is enabled later always fails (only primary display works?)

Playing with 'xset dpms force off' has no effect on the issue.

Playing with various modes and refresh rates using xrandr has no effect on the

I also tried the latest radeon driver from git, it made no difference.

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