[Bug 19323] New: PAL Interlaced mode showing only top half desktop for HD3200 ( IGP on GA-MA78GM-S2H)

[bugzilla-daemon at freedesktop.org]

http://bugs.freedesktop.org/show_bug.cgi?id=19323

           Summary: PAL Interlaced mode showing only top half desktop for
                    HD3200 (IGP on GA-MA78GM-S2H)
           Product: xorg
           Version: unspecified
          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: richard at vdtoorn.nl
         QAContact: xorg-team at lists.x.org


Created an attachment (id=21550)
 --> (http://bugs.freedesktop.org/attachment.cgi?id=21550)
TV screen showing top half of desktop, illustrated by xclock -geometry 200x200

I'm trying to display X on a regular old-fashioned PAL television, using the
VGA port of a Gigabyte GA-MA78GM-S2H with integrated HD3200 GPU (780g). I
couldn't get composite sync on the HSYNC pin, so I constructed a small
electronic circuit to combine horizontal and vertical sync into composite sync.
The motherboard doesn't have tv-out so I'm stuck (fortunately?) on the VGA
port.

I can get synchronization on the TV, but only the top of the desktop is
displayed....See the screenshot, displaying 'xclock -geometry 200x200'; You can
clearly see overscan, which is okay. But the last visible line seems to be at
288px (desktop is x2:576px). I can also see the some parts of the cursor,
probably positioned exactly in the middle. There is a difference if I turn off
interlace, but it only increases flicker.

Some more details:

* Running debian unstable, with package "xorg 7.3+18"
* compiled radeon driver 6.9.0.91 
* no special xorg configuration or nothing strange in the logfile, will attach
later.
* The desktop is probably still running at 768x576, but the lower half is never
displayed on the television. 
* This could be related to bug 12626, running the 6.9.0 driver gave me the
black horizontal band in the middle.

Questions:

? Did i misconfigure X for running PAL on the VGA port, or is this a bug?
? could it be the cable? I assumed that if I have sync, the cable must be fine.
? how to debug this is in the code? I have some programming experience, so any
help there is appreciated as well.

Thanks (Alex, and others)


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