From mboxrd@z Thu Jan  1 00:00:00 1970
From: =?ISO-8859-1?Q?Marius_Gr=F6ger?= <marius.groeger@googlemail.com>
Subject: Re: [PATCH] drm/radeon/kms: don't enable underscan with interlaced
	modes
Date: Wed, 22 Sep 2010 20:24:46 +0200
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To: Alex Deucher <alexdeucher@gmail.com>
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Am 22.09.2010 06:40, schrieb Alex Deucher:
> 2010/9/21 Marius Gr=F6ger<marius.groeger@googlemail.com>:
>> On 10.09.2010 17:20 Alex Deucher wrote:
>>>
>>> The scaler doesn't appear to work with interlaced modes as you've
>>> noticed; I don't off hand know whether it can be made to or not.
>>> Unfortunately, I won't have time to dig into this more for a while.
>>
>> Is there public documentation available wrt this matter? www.x.org/docs/=
AMD/
>> appears to focus on 3D stuff primarily...
>>
>
> Not at the moment, however, you could implement underscan using the 3D
> engine to do the scaling rather than the display scalers.  I think you
> could even do it with randr crtc transforms (which use the 3d engine).

Are you referring to xrandr --transpose? At least for me this seems to =

be only partially implemented. For example:

xrandr --output HDMI-0 --mode 1920x1080@50i --transform =

0.5,0,0,0,0.5,0,0,0,1

This does in fact render the image scaled down by 50%. However,

xrandr --verbose

yields:

HDMI-0 connected 1920x1080+0+0 (0xfd) normal (normal left inverted right =

x axis y axis) 1600mm x 900mm
...
	Transform:  1.000000 0.000000 0.000000
	            0.000000 1.000000 0.000000
	            0.000000 0.000000 1.000000

Translation doesn't work at all, so it's not a viable workaround.

Sigh. This is all kind of frustrating...

Regards,
Marius