[mythtv-users] ION + VDPAU + no composite and still tearing

James Courtier-Dutton james.dutton at gmail.com
Wed Dec 22 19:47:08 UTC 2010


On 22 December 2010 17:25, Brian J. Murrell <brian at interlinx.bc.ca> wrote:
> On Wed, 2010-12-22 at 16:36 +0000, James Courtier-Dutton wrote:
>>
>> The Nvidia driver has a mode called "scaling mode".
>
> In my nvidia-settings it's in the "DFP-0 (LG TV)" page under "GPU 0 -
> (ION LE)" in a box on the top right labelled "Flat Panel Scaling".
>
>> By default this is set to "Full".
>
> Mine is currently unchecked at all and the Scaling: attribute says
> "None".
>
>> Set it to "None".   (The nvidia-settings tool can be used to set this.)
>
> Indeed, I already had this set, so it was None even when I was getting
> tearing.
>
>> xrandr --prop    (will tell you what mode it is currently using.)
>
> Screen 0: minimum 320 x 175, current 1920 x 1080, maximum 1920 x 1080
> default connected 1920x1080+0+0 0mm x 0mm
>   1920x1080      50.0     51.0*    52.0     53.0     54.0     55.0
>   1680x1050      56.0     57.0
>   1440x900       58.0
>   1400x1050      59.0     60.0     61.0
>   1360x768       62.0     63.0     64.0
>   1280x1024      65.0     66.0     67.0     68.0     69.0
>   1280x960       70.0     71.0
>   1280x768       72.0
>   1280x720       73.0     74.0
>   1152x864       75.0     76.0     77.0     78.0     79.0     80.0     81.0
>   1024x768       82.0     83.0     84.0     85.0     86.0     87.0     88.0     89.0
>   960x600        90.0
>   960x540        91.0
>   840x525        92.0     93.0     94.0     95.0     96.0
>   832x624        97.0
>   800x600        98.0     99.0    100.0    101.0    102.0    103.0    104.0    105.0    106.0
>   720x480       107.0
>   720x450       108.0
>   720x400       109.0
>   700x525       110.0    111.0
>   680x384       112.0    113.0
>   640x480       114.0    115.0    116.0    117.0    118.0    119.0    120.0
>   640x400       121.0
>   640x350       122.0
>   512x384       123.0    124.0    125.0
>   400x300       126.0
>   320x240       127.0    128.0
>   320x175       129.0
>
>> When switched to "None", the video modeline seen by the application
>> matches that of the TV and tearing disappears.
>
> FWIW, the "Flat Panel Information" box to the left of the "Flat Panel
> Scaling" box says that I am currently at a Native Resolution and
> Frontend Resolution (i.e. both) of 1920x1080 and that my Refresh Rate:
> is 59.94 Hz.  IIRC however, that refresh will change depending on the
> source material, which is good and what I want.
>
>> Also, enabling OpenGL instead of QT output mode in mythfrontend seems
>> to help the tearing, but I don't know why.
>
> I think I have that set already.  Which setup screen is it in?
>
>> Kind Regards
>
> Much thanx for all of the pointers!
>
> b.
>

The OpenGL/QT option is on one of the mythfrontend setup screens.


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