[mythtv-users] ATI Radeon VGA to RGB SCART problems

Rob Beard rob at esdelle.co.uk
Fri Apr 20 15:37:24 UTC 2007


Nick Morrott wrote:
> On 20/04/07, Rob Beard <rob at esdelle.co.uk> wrote:
>   
>> Hi folks,
>>
>> I was hoping someone might be able to help?
>>
>> I've have had a cable made up to connect the VGA output from my ATI
>> Radeon 9200SE.  I'm trying to configure Ubuntu (Fiesty 7.04 Beta) to
>> display X Windows on the TV using this ATI card.  When I plug the cable
>> in the TV will default to the correct scart socket but I don't get
>> anything on the screen apart from a slight brownish glow right at the
>> top of the screen which fades down the screen to black.  It appears that
>> the TV is switching to 60Hz too.
>>
>> When I restart the machine the TV looses sync as it goes through the
>> bios and bootup (I figured this would be the case with it being too much
>> for the TV to handle).
>>
>> The configuration I used from was from the MythTV wiki here:
>> http://www.mythtv.org/wiki/index.php/RGB_Scart
>>
>> I adjusted the video card identifier so it would find the screen.  The
>> instructions I used for the cable were from here:
>> http://ryoandr.free.fr/english.html
>>
>> The contents of my xorg.conf are below:
>>
>> Section "Monitor"
>>         Identifier   "Generic Monitor"
>>         HorizSync    14.0 - 18.0
>>         VertRefresh  45.0  - 65.0
>>         Option      "DPMS"
>>         Modeline     "720x576" 15.125 720 778 834 968 576 579 607 625
>> composite interlace +hsync +vsync
>> EndSection
>>
>>
>> Section "Device"
>>         Identifier  "Generic Video Card"
>>         Driver      "ati"
>>         Option      "DynamicClocks" "true"
>>         Option      "ForceMinDotClock" "14MHz"
>>         Option      "MergedFB" "false"
>>         Option      "IgnoreEDID" "true"
>>         Option      "VGAAccess" "false"
>>         BusID       "PCI:1:0:0"
>> EndSection
>>
>> Section "Screen"
>>         Identifier      "Default Screen"
>>         Device          "Generic Video Card"
>>         Monitor         "Generic Monitor"
>>         DefaultDepth    24
>>         SubSection "Display"
>>                 Depth           1
>>                 Modes           "640x480"
>>         EndSubSection
>>         SubSection "Display"
>>                 Depth           4
>>                 Modes           "640x480"
>>         EndSubSection
>>         SubSection "Display"
>>                 Depth           8
>>                 Modes           "640x480"
>>         EndSubSection
>>         SubSection "Display"
>>                 Depth           15
>>                 Modes           "640x480"
>>         EndSubSection
>>         SubSection "Display"
>>                 Depth           16
>>                 Modes           "640x480"
>>         EndSubSection
>>         SubSection "Display"
>>                 Depth           24
>>                 Modes           "640x480"
>>         EndSubSection
>> EndSection
>>
>> This is the first time I've tried something like this and I'm a bit
>> stuck.  Could anyone advise what I'm doing wrong here?
>>     
>
> Firstly, your /var/log/Xorg.0.log probably contains the answer. Something like:
>
> # grep "(EE)" /var/log/Xorg.0.log
>
> should quickly show any errors.
>
> Secondly, why have you not specified the 720x576 modeline in any of
> your defined screen displays? They're currently all set to use a
> 640x480 mode.
>
> I use a homebuilt VGA->SCART with my Radeon 9000 without any problems
> in the UK, so it's definitely possible, although you might find you
> want to use xvidtune once you have the display working to fine tune
> things.
>
> Nick
>   

Thanks for the quick reply Nick.  It turns out the TV that I was using 
didn't support RGB through the scart socket (I was using the kids TV).  
I'll try on our main TV, I'll also make the changes to the screen size too.

Rob



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