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

Marius Gröger marius.groeger at googlemail.com
Wed Aug 4 05:27:08 PDT 2010

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?

- more of a general drm question I guess: in what way are the connector
attributes available on the command line? I couldn't find a complete
kernel command line or modprobe invocation.


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