From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andy Furniss <adf.lists@gmail.com>
Subject: Re: [PATCH] drm/edid: Add both 60Hz and 59.94Hz CEA modes to
	connector's mode list
Date: Sun, 23 Jun 2013 21:01:10 +0100
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To: Alex Deucher <alexdeucher@gmail.com>
Cc: dri-devel <dri-devel@lists.freedesktop.org>
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Alex Deucher wrote:
> On Sat, Jun 1, 2013 at 5:13 AM, Andy Furniss <adf.lists@gmail.com> wrote:
>> Daniel Vetter wrote:
>>
>>> Interlaced modes are supported on all intel platforms (except i8xx, hw
>>> can't do it there) and we have full support for CEA modes.
>>> -Daniel
>>
>>
>> OK, thanks, I guess it's an AMD driver issue rather than a more generic drm
>> thing then.
>
> You might try removing this chunk of code in radeon_atom_mode_fixup()
> in atombios_encoders.c
>
>          /* hw bug */
>          if ((mode->flags & DRM_MODE_FLAG_INTERLACE)
>              && (mode->crtc_vsync_start < (mode->crtc_vdisplay + 2)))
>                  adjusted_mode->crtc_vsync_start =
> adjusted_mode->crtc_vdisplay + 2;

Thanks, but it doesn't make any difference.

To slightly correct what I said earlier when describing what I see -

at 1920x1080i the right quarter of the bottom line is rendering repeated 
x4 as the top line.