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Thread: Purple Tint until I reconnect video cable

  1. #1
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    Feb 2013
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    Purple Tint until I reconnect video cable

    I've been googling for a while trying to figure this one out to no avail, so hoping that someone here can point me in a direction to try to find a solution. My linux experience is pretty minimal, so I appreciate any specifics that can be tossed out.

    I'm running Mythbuntu 12.04, fresh install. Every time I boot or reboot the computer, the whole desktop is tinted purple - especially the areas that should be black. This continues on top of any and all applications that I run. If I disconnect the HDMI cable, or even switch HDMI inputs on the TV to something else and back to the PC, the purple vanishes, and all looks normal. Viewing in a VNC session shows blacks where they should be, and no purple tint.

    This does NOT manifest ever when booting a live-stick of Ubuntu 12.04 or Mythbuntu 12.04. It never manifests if I boot into windows. It's only when booting to the new installation of Mythbuntu on the local hdd. This has happened since first installed, and has never changed as I have run updates/changed nvidia drivers, etc.

    This leads me to think it's an HDCP handshake thing that's going slightly wrong, but I have no idea where to start digging.

    Any help would be appreciated, this is the last stumbling block to having my MythTV box running as desired.

    Thanks!

    Setup (yea, it's old, it does the job)
    Asus P5LD2-VM board
    2.13ghz c2d
    2gb ram
    GeForce 9600 GSO

  2. #2
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    Re: Purple Tint until I reconnect video cable

    Bump.

  3. #3
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    Re: Purple Tint until I reconnect video cable

    Moved to Mythbuntu subforum.
    Learning is not attained by chance, it must be sought for with ardor and attended to with diligence. Abigail Adams ( 1744 - 1818 ), 1780;

    My blog Poetry and More Free Ubuntu Magazine

  4. #4
    Join Date
    Dec 2008
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    Re: Purple Tint until I reconnect video cable

    I risk sounding like the child with a hammer who sees the world as a nail because I've just replied to Steve666 who has another Nvidia issue:

    "A silly question probably but when you fitted your Nvidia card, did you invoke the drivers?
    On my 12.04 system I needed
    Mythtv control centre
    > launch restricted drivers manager
    > nvidia accelerated graphics driver (version current) [recommended]
    "

    Best wishes
    Phil

  5. #5
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    Re: Purple Tint until I reconnect video cable

    My work winXP & LG24" LCD (HDMI but not a TV panel) used to do something similar..wrong colour-space on booting..Had to fiddle with the monitor OSD after every reboot.
    HDMI supports RGB & YUV colour-spaces.

    You could try running "nvidia-settings" and see if changing the colour-space & studiolevels (colour range) causes the same colour shift..

    You could post your /var/log/Xorg.0.log file after booting & fixing the colour shift..

  6. #6
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    Feb 2013
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    Re: Purple Tint until I reconnect video cable

    Quote Originally Posted by PhilWig View Post
    I risk sounding like the child with a hammer who sees the world as a nail because I've just replied to Steve666 who has another Nvidia issue:

    "A silly question probably but when you fitted your Nvidia card, did you invoke the drivers?
    On my 12.04 system I needed
    Mythtv control centre
    > launch restricted drivers manager
    > nvidia accelerated graphics driver (version current) [recommended]
    "

    Best wishes
    Phil
    Not silly, but it's the first thing I checked. I tried all of the variants there listed as well, initially thinking it was a driver issue, since I didn't have the issue in vanilla ubuntu's live-stick, it seemed that drivers made sense.

    Since I originally posted this, I actually have reformatted and reinstalled mythbunty 12.04 for self-inflicted issues, and the issue still persists, though it should be on the OOtB nvidia driver now.

    Quote Originally Posted by BicyclerBoy View Post
    My work winXP & LG24" LCD (HDMI but not a TV panel) used to do something similar..wrong colour-space on booting..Had to fiddle with the monitor OSD after every reboot.
    HDMI supports RGB & YUV colour-spaces.

    You could try running "nvidia-settings" and see if changing the colour-space & studiolevels (colour range) causes the same colour shift..

    You could post your /var/log/Xorg.0.log file after booting & fixing the colour shift..
    I changed the colorspace from RGB to the other one and rebooted, it still came up purple. Disconnected and reconnected the HDMI, looks normal now. Log here:
    http://pastebin.com/R89QeBmy

  7. #7
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    Re: Purple Tint until I reconnect video cable

    Nothing in the Xorg.0.log to suggest any hot-plug event occurred..
    Is there any clues in "dmesg" output after the hot-plug fix?

  8. #8
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    Feb 2013
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    Re: Purple Tint until I reconnect video cable

    Quote Originally Posted by BicyclerBoy View Post
    Nothing in the Xorg.0.log to suggest any hot-plug event occurred..
    Is there any clues in "dmesg" output after the hot-plug fix?
    I looked at dmesg before and after plugging and unplugging the cable and I didn't notice anything new in there.

    Could there be any difference because I'm using a DVI to HDMI adapter that would cause it not to notice that i've been connecting or disconnecting the video?

  9. #9
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    Re: Purple Tint until I reconnect video cable

    Re-plugging the video cable should cause hot-plug events..especially HDMI.
    There should be events in dmesg (about ELD HDA stuff) & Xorg.0.log.

    The common DVI-HDMI adapter is a passive single link cable.
    Like I said before, the windows driver had problems with incorrect colour-space some time back.
    But we do not know if colour-space is the problem.

    Note HDMI is == single link DVI & limited to 1920x1200@60.

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