Interlace modes with r600 KMS

[Alex Deucher]

2010/9/7 Marius Gröger <marius.groeger at googlemail.com>:
> Hi All,
>
> I'm not able to use interlace modes (r600 KMS from d-r-t, HDMI output, Xorg
> stack on xorg-edgers, Ubuntu lucid). All interlace modes which are defined
> in EDID seem to be pruned and don't appear in xrandr. Manually adding a mode
> using xrandr does work, and the TV set detects the mode, but the image shows
> horizontal lines. No crash though.
>
> Interlace modes did use to work fine in the past, but I don't know when they
> ceased to function.
>
> What is the status of interlace modes on this kind of setup? What more tests
> or logs would be helpful to analyze the problem? What are other people's
> experiences with this?

This isn't a driver bug as far as I can tell.  At some point the
Xserver started purging interlaced modes.  See this bug:
https://bugs.freedesktop.org/show_bug.cgi?id=29591

Alex