handling radeon overscan

[Alex Deucher]

On Sat, Jan 15, 2011 at 5:50 PM, Matthew Monaco <dgbaley27 at verizon.net> wrote:
>>On 01/15/2011 04:28 PM, Matthew Monaco wrote:
>>>
>>> On 01/15/2011 12:19 PM, Alex Deucher wrote:
>>>>
>>>> On Sat, Jan 15, 2011 at 8:31 AM, Matthew Monaco<dgbaley27 at verizon.net>
>>>> wrote:
>>>>>
>>>>> My monitor, ASUS VE248H, looks horrible when the overscan is on (or is
>>>>> it
>>>>> off? The image on the screen is too small.)
>>>>>
>>>>> There is an option for Full / Overscan, however it doesn't seem to have
>>>>> any
>>>>> effect on the image (I really wish it did).
>>>>>
>>>>> This is all on HDMI, over DVI it looks fine; I guess the monitor gives
>>>>> a
>>>>> different EDID per connection.
>>>>>
>>>>> What are my options here?
>>>>
>>>> xrandr --output<OUTPUT> --set underscan off
>>>>
>>>> Alex
>>>>
>>>
>>>
>>> Thanks. Are there any plans to include this in xorg.conf so it take
>>> effect
>>> immediately for all X sessions, or even in the kernel so KMS works
>>> nicely?
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>>>
>>It's disabled by default starting in 2.6.38
>>
>>Alex
>
> Applied
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=56bec7c009872ef33fe452ea75fecba481351b44
>
> Looks great in X, no effect on the console.
>
> Funny commit comment. Wouldn't adding radeon.underscan={auto,off,on} appease
> all? Or a setting in the video= command line option like
> video=HDMI-0:underscan{off,on,auto}?

The first option doesn't deal with users that want underscan enabled
on one monitor, but off on the other.  The second patch would be ideal
(connector attributes should be exposed via sysfs as well), but
requires a fair amount of infrastructural work I don't have time to
implement at the moment.  It would be a good starter project from
someone looking to help out with the drm though.

Alex