[PATCH 2/2] drm/radeon/kms: enable underscan option for digital connectors

[Marius Gröger]

Am 04.08.2010 16:35, schrieb Alex Deucher:
> 2010/8/4 Marius Gröger<marius.groeger at googlemail.com>:
>> Am 04.08.2010 01:59, schrieb Alex Deucher:
>>>
>>> This connector attribute allows you to enable or disable underscan
>>> on a digital output to compensate for panels that automatically
>>> overscan (e.g., many HDMI TVs).  Valid values for the attribute are:
>>>
>>> off - forces underscan off
>>> on - forces underscan on
>>> auto - enables underscan if an HDMI TV is connected, off otherwise
>>>
>>> default value is auto.
>>
>> Terrific! Two questions:
>>
>> - inevitably, on my TV Set (SONY KDL 3000) this now doing too much
>> underscan. In pixels: without your patch, I used a custom modeline to
>> map 1280x720p to 1220x680p, so I'm 40 pixels down in each dimension. How to
>> fix that?
>
> Adjust radeon_crtc->v_border and radeon_crtc->h_border in the patch to
> whatever size you want.

Thanks. It turns out that I need different values to fit the screen 
(probably due to native 1366/768 != 1280/720). This is of course at the 
cost of slightly changing the rendered ratio, but that's fine with me.

Any plans to make those values tunables?

Also, I kind of was hoping that once I could use 1280x720 for both the 
console and the X screen, it would would allow me to switch between the 
two transparently. Instead, the TV takes notice of the switch and needs 
some extra syncing time. Is this expected behaviour?

Thanks
Marius