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Thread: Catalyst 12.6 Underscan

  1. #1
    Join Date
    Apr 2011
    Chicago, IL, USA

    Catalyst 12.6 Underscan

    I was having problems with my Radeon 6850 underscaning each boot (it wouldn't save underscan setting). Each time I rebooted the computer it would return to black bars and underscanned. I didn't find much even with a lot of searching.

    Then I found

    The solution was the optional step after step 9 in the guide:
    (Optional 9b. if you have black bars normally, disable underscan (always after lightdm has stopped): sudo aticonfig --set-pcs-val=MCIL,DigitalHDTVDefaultUnderscan,0)

    Posting it here in case anyone else has this problem.

  2. #2
    Join Date
    Dec 2012

    Re: Catalyst 12.6 Underscan

    + 5mo later and this solution worked for me, thanks.

    Ubuntu 12.10
    AMD/Ati BETA drivers (12.11)
    Radeon HD6750

  3. #3
    Join Date
    Aug 2013

    Re: Catalyst 12.6 Underscan

    Thanks for posting! The same fix works for Catalyst 13.4 in Ubuntu 13.04. Perhaps the better question is: who would have thought that this should not be the default behaviour, and if anyone happens to know them, could you give them a good shake?

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