[Bug 32450] KMS defaults to underscan, no way to permanently turn it off

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Thu Dec 23 11:10:39 PST 2010


--- Comment #9 from Michael at Heimann.ws 2010-12-23 11:10:39 PST ---
First I want to express the respect I owe you guys for spending precious time
on free code. Many thanks ! You deserve it!

Second, I understand that you copied the behaviour of frglx and activate
underscan by default.

Third, I want to kindly ask you to change the default to 1:1 display. Overscan
is simply wrong if you're connecting a PC to a TV. TVs are doing overscan to
respect the corrupt first or last lines that are used in TV signal to transmit
information (I heard that - it may be nonsense). Some TVs always oversan. That
is the ONLY case where undescan makes sense. But Monitors with 1080p
resolution, TVs without overscan (or overscan turned off) are more common cases
when it comes to PC displays.

I think in a perfect world, you would make 1:1 display default. To handle TVs
attached to PCs you could do some magic - if:

- display reports TV-like resolutions (interlaced)
- display reports audio capabilities
- display name has TV in it - sample:

michael at michael-desktop:/var/log$ grep TV Xorg.0.log
[    34.610] (II) RADEON(0): Monitor name: Panasonic-TV

If all that (or most) is true than you might enable underscan by default. You
could also check versus a underscan positive list where you put devices in
which can't disable overscan.

Thanks for reading, merry christmas and a happy new year!!!

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