Interlace modes with r600 KMS
alexdeucher at gmail.com
Tue Sep 7 08:53:45 PDT 2010
2010/9/7 Marius Gröger <marius.groeger at googlemail.com>:
> Am 07.09.2010 16:52, wrote 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,
>>> stack on xorg-edgers, Ubuntu lucid). All interlace modes which are
>>> in EDID seem to be pruned and don't appear in xrandr. Manually adding a
>>> using xrandr does work, and the TV set detects the mode, but the image
>>> horizontal lines. No crash though.
>>> Interlace modes did use to work fine in the past, but I don't know when
>>> ceased to function.
>>> What is the status of interlace modes on this kind of setup? What more
>>> 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:
> Thanks for the pointer. I did look into the xserver sources a bit and while
> I'm far from understanding exactly what's going on, it seems like the server
> is relying on output->interlaceAllowed and output->doubleScanAllowed. Aren't
> these bools in the domain of the display driver (granted, this wouldn't be
> the radeon module but the xf86-video-ati driver)?
I guess so. Interlace used to work without those parameters set; I
guess the xserver behavior changed in the meantime. I've gone ahead
and set them in the driver.
> Also, as I wrote, the purging seems to be half-done, since I am able to
> manually add an interlaced mode. But since that mode doesn't work properly -
> does the radeon module support interlaced modes? Is there a non-X way to
> verify this?
It did in the past, however, at the moment, I don't have a interlaced
capable monitor to test. Can you try again with xf86-video-ati from
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