[mythtv-users] Minor Screen Refresh Visible

Petteri Matilainen pmatil at gmail.com
Wed Jul 30 13:07:03 UTC 2008


C.T. Paterson wrote:
> 2008/7/30 Petteri Matilainen <pmatil at gmail.com>:
>   
>> On 7/30/08, C.T. Paterson <i.adore.my.64 at gmail.com> wrote:
>>     
>>> 2008/7/30 William <william_munson at comcast.net>:
>>>       
>>>> C.T. Paterson wrote:
>>>>         
>>>>> I find the problem a little difficult to explain - which is probably
>>>>> why I'm finding it hard to google for it.
>>>>>
>>>>> My video is 98% fine - but there is a bit of a refresh artifact that
>>>>> rolls from top to bottom across the screen over a few seconds.  Most
>>>>> of the time it is not even noticable, but when the image is static
>>>>> (ie. menus) it's more visible.  I have always had this - when I was
>>>>> outputting to a CRT, and now on my new LCD TV.
>>>>>
>>>>> My xorg.conf is attached, and my video card details are below (from
>>>>> lshw); although if there was a non-nVidia specific setting I could
>>>>> try, I'd be curious to know that, too, as I'm considering pulling the
>>>>> card in favour of o/b video for heat and power reasons.
>>>>>
>>>>>   *-display
>>>>>                 description: VGA compatible controller
>>>>>                 product: GeForce 8400 GS
>>>>>                 vendor: nVidia Corporation
>>>>>                 physical id: 0
>>>>>                 bus info: pci at 0000:01:00.0
>>>>>                 version: a1
>>>>>                 width: 64 bits
>>>>>                 clock: 33MHz
>>>>>                 capabilities: pm msi pciexpress vga_controller
>>>>> bus_master cap_list
>>>>>                 configuration: driver=nvidia latency=0 module=nvidia
>>>>>
>>>>> Am I making any sense to anyone?  ;>
>>>>>
>>>>> Cheers.
>>>>>
>>>>>
>>>>>           
>>>> It sounds like it may be a power supply issue. Pull that video card and
>>>> try the internal video.
>>>>         
>>> Power, really?  I have no reason to disbelieve you - my 300W PSU does
>>> seem to have to strain (I was having a lot of crash problems until I
>>> made one of the internal drives an external drive with its own power);
>>> I'm just surprised that I would see that kind of effect.
>>>
>>> I had some time this a.m., so I've pulled the nvidia card out in
>>> favour of the o/b intel G33.  The refresh lines or screen shear or
>>> whatever it was is gone.
>>>
>>> I know have a couple of new minor irritants - but I'll take that to
>>> another thread.
>>>
>>> Thanks all.
>>>
>>> Cheers.
>>>
>>> --
>>> "My country is the world, and my religion is to do good."
>>>  -- Thomas Paine
>>> _______________________________________________
>>> mythtv-users mailing list
>>> mythtv-users at mythtv.org
>>> http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
>>>
>>>       
>> I have the same problem, and I doubt it's because the power supply. I
>> have a 400 W PSU, GF FX5600XT AGP graphics card, and Athlon 64 3500+
>> CPU. The lines appear only on TV, which is connected to my PC via
>> VGA->SCART adapter cable. Do I need to modify the xorg.conf modeline?
>> Any help is greatly appreciated.
>>     
>
> My experience does not suggest I had a modeline problem - but it's
> possible.  Where did you get yours from?  I've got an LCD HDTV, and
> some of them are known to supply incorrect modelines to Xorg (google
> for a "UseEDID" xorg option).  Mine appeared to be one of them, so I
> obtained mine by running "gtf" on the command line, and used the
> generated modeline in my xorg.conf.
>
> Now, before I had this LCD, I had a regular CRT TV for which I didn't
> use any crafted modelines (just regular low rez), and I still had the
> refresh/shear, I described above.
>
> It may not have been power, in my case - but it looks like it.
> Different TVs with different modes manifested the problem.  I have
> only dispatched it by removing my video card and using the o/b
> instead, and my PSU was known to be dancing on the edge of its
> ability.
>
> (By the way, kids, beware of HTPC cases with included PSUs - they
> might be microATX supplies instead of ATX supplies - and it's near
> impossible to find any replacement microATX PSUs with any juice.)
>
> This also leaves open the possibility that the card itself was
> pooched.  I don't readily have another system I can test it in - but
> I'll see if I can find one.
>
> Cheers.
>
>   
I have a Philips 16:9 CRT TV, so yes, a custom modeline. I've been using 
"standard PAL 720x576" modeline found in mythtv wiki. I have tried other 
resolutions, but can't remember if it occurs with any resolution.

-P.M.


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