[mythtv-users] composite video problems with upgrade to, mythdora (same problem with mythbuntu)

Larry mythtv at american-hero.com
Thu May 13 13:23:15 UTC 2010

On 5/13/2010 7:20 AM, mythtv-users-request at mythtv.org wrote:
> On Wed, May 12, 2010 at 11:45 PM, Larry <mythtv at american-hero.com> wrote:
>> > Ok, now that I have my lirc problem fixed I migrated my frontend back up
>> > to the living room.  When I connected the composite video up to my TV my
>> > original problem returned.
>> > All was well in the world until i upgraded to myth .23.  The backend
>> > works fine as does the local frontend on the box. The backend is just a
>> > CENTOS distro running the atrpms packages.
>> > My problem is the remote frontend box.  I was running mythbuntu 9.10
>> > until I upgraded to .23 which required I upgrade the mythbuntu box's to
>> > 10.04.  Once I did that my video out stopped working, or rather the
>> > output became garbled.
>> > I though the problem may be mythbuntu specific so I switched to mythdora
>> > but the problem followed it.
>> >
>> > my video card is
>> > 01:00.0 VGA compatible controller: VIA Technologies, Inc. VT8623 [Apollo
>> > CLE266] integrated CastleRock graphics (rev 03)
>> >
>> > I have tried the openchrome driver, vesa,via and even vga to no success.
>> >
>> > during the boot process I can see all the screen just fine, but when X
>> > starts its as if the screen is somewhat "rolling" and "flickering"
>> > By changing the modes I can control somewhat how the "rolling" and
>> > "flickering" is presented but not stop the behavior.
>> >
>> > I'm not even sure how to diagnose this.  Depending on which slew of
>> > options i specify I get different errors in my Xorg.0.log but nothing
>> > that I can find that tells me what the problem is.
>> >
>> > Given that TV out via composite works just fine during bootup I'm
>> > guessing that I should be able to use some simple X driver but I have
>> > yet to land on the correct one.
>> >
>> > Anyone care to throw ideas out on how to diagnose what my actual issue is?
> Sadly, I suspect the answer is this: via video hardware sucks. There
> are very few users of it to begin with, relative to ATI and nVidia
> (and even Intel these days), and even less on the Linux side. Linux
> support for their video chipsets has always been pretty shaky, which
> presents a chicken and egg issue -- nobody wants to use it due to
> issues with it, but then there really isn't significant impetus to
> make it work really well. I suspect this is a simple case of nobody
> keeping the via video drivers up to snuff with the latest Xorg. I
> could be wrong there, but none of the X hackers I know touch
> openchrome on any regular basis, nor do they want to -- they all focus
> on intel, radeon and nouveau.
> -- Jarod Wilson jarod at wilsonet.com
Well I would agree with you but the box's I'm using for my frontend are
a)free b)small c)quiet and d)free :).  They also lack any slots so I
cant really add in an extra video card.
Did I mention they are free and I have 4 of them that are all identical?

Good news is that I believe I have fixed the issue.  I finally went with
the brute force method of adding in options and restarting X.
Three prayers to the xorg gods and a sacrifice of my sanity to the
openchrome driver god I have what looks to be a working solution.

For anyone who cares I have included the final options that made my
video work. I have no idea what was the magic setting but I'm not about
to go screwing around with now that it works!

Section "Device"
        Identifier  "Videocard0"
        Driver      "openchrome"
        Option  "ActiveDevice" "CRT,TV"
        Option  "TVType" "NTSC"
        Option  "TVOutput" "Composite"
        Option  "EnableAGPDMA"  "enable"
        Option  "NoAccel"       "enable"
        Option   "I2CScan"
        Option   "VBEModes"     "enable"
        Option   "SWCursor"
        Option   "ShadowFB"
        Option   "VbeSaveRestore" "enable"
        Option   "ModeSwitchMethod"  "new"


Section "Screen"
        Identifier "Screen0"
        Device     "Videocard0"
        Monitor "Monitor0"
        DefaultDepth     24
        SubSection "Display"
                Viewport   0 0
                Depth     24
                Modes   "720x480NoScale"
Section "Monitor"
        Identifier   "Monitor0"
#        HorizSync    30 - 50
#        VertRefresh  50.0 - 50.0
        Option "DPMS"
Section "DRI"
    Mode 0666

Section "Extensions"
  Option "Composite" "Enable"

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