[mythtv-users] overscan compensating display manager?

[Alex Halovanic]

No I meant adjusting JUST the 1280 and 720 numbers, leave the others
alone to leave it in 1280x720 timings.  All it should do is put out
exactly the same picture as before, but not use all of the pixels on the
sides just as an overscan compensating window manager would.


On Tue, 2008-02-12 at 23:45 -0600, John and Holly Klug wrote:
> Alex Halovanic wrote:
> > "1296x724 at 60" 75.13 1296 1328 1608 1640 724 739 746 761
> > "720p" 74.25 1280 1390 1430 1650 720 725 730 750 +hsync
> >
> >   ...
> >
> > If that 720p modeline works for you, you should be able to 'underscan'
> > it fairly easily by simply changing the 1280 and 720 values to something
> > smaller (by a factor of 8 of course).  It's a bit fiddly and involves
> > restarting X a lot (and there are methods of changing the numbers to
> > move it horizontally and vertically too) but you do end up with a a
> > screen where any app you start will have its edges visible, not just
> > mythfrontend.
> Unfortunately, I have to battle the Nvidia driver which has a mind of 
> its own.  I tried your suggestion of reducing the resolution, and my TV 
> went to 1080i in both cases I tried:
> 
> xorg.conf:
>  ModeLine "720p"   74.25 1280 1390 1430 1650 720 725 730 750 +hsync +vsync
>  ModeLine "700p"   80.00 1240 1272 1528 1560 700 714 721 736 +hsync +vsync
>  Modeline "648p"   58.82 1152 1184 1400 1432 648 661 668 681 +hsync +vsync
>    
> 
>  From Xorg.0.log:
> 
> (--) NVIDIA(0): Detailed Timings:
> (--) NVIDIA(0):   1920 x 1080 @ 60 Hz
> (--) NVIDIA(0):     Pixel Clock      : 74.25 MHz
> (--) NVIDIA(0):     HRes, HSyncStart : 1920, 2008
> (--) NVIDIA(0):     HSyncEnd, HTotal : 2052, 2200
> (--) NVIDIA(0):     VRes, VSyncStart : 1080, 1084
> (--) NVIDIA(0):     VSyncEnd, VTotal : 1094, 1124
> (--) NVIDIA(0):     H/V Polarity     : +/+
> (--) NVIDIA(0):     Extra            : Interlaced
> (--) NVIDIA(0):   1280 x 720  @ 60 Hz
> (--) NVIDIA(0):     Pixel Clock      : 74.25 MHz
> (--) NVIDIA(0):     HRes, HSyncStart : 1280, 1390
> (--) NVIDIA(0):     HSyncEnd, HTotal : 1430, 1650
> (--) NVIDIA(0):     VRes, VSyncStart : 720, 725
> (--) NVIDIA(0):     VSyncEnd, VTotal : 730, 750
> (--) NVIDIA(0):     H/V Polarity     : +/+
>   ...
> (II) NVIDIA(0):   Validating Mode "720p":  ** My modeline matching EDID **
> (II) NVIDIA(0):     1280 x 720 @ 60 Hz
> (II) NVIDIA(0):     Mode Source: X Configuration file ModeLine
> (II) NVIDIA(0):       Pixel Clock      : 74.250 MHz
> (II) NVIDIA(0):       HRes, HSyncStart : 1280, 1390
> (II) NVIDIA(0):       HSyncEnd, HTotal : 1430, 1650
> (II) NVIDIA(0):       VRes, VSyncStart :  720,  725
> (II) NVIDIA(0):       VSyncEnd, VTotal :  730,  750
> (II) NVIDIA(0):       H/V Polarity     : +/+
> (II) NVIDIA(0):     BestFit Backend for "720p": 1280x720
> (II) NVIDIA(0):     Mode is valid.
>   ...
> (II) NVIDIA(0):   Validating Mode "700p":
> (II) NVIDIA(0):     1240 x 700 @ 60 Hz
> (II) NVIDIA(0):     Mode Source: X Configuration file ModeLine
> (II) NVIDIA(0):       Pixel Clock      : 69.200 MHz
> (II) NVIDIA(0):       HRes, HSyncStart : 1240, 1272
> (II) NVIDIA(0):       HSyncEnd, HTotal : 1528, 1560
> (II) NVIDIA(0):       VRes, VSyncStart :  700,  714
> (II) NVIDIA(0):       VSyncEnd, VTotal :  721,  736
> (II) NVIDIA(0):       H/V Polarity     : +/+
> (II) NVIDIA(0):     BestFit Backend for "700p": 1920x1080      ***NOT 
> USEFUL***
> (II) NVIDIA(0):     Mode is valid.
>  ...
> (II) NVIDIA(0):   Validating Mode "648p":
> (II) NVIDIA(0):     1152 x 648 @ 60 Hz   *** Multiples of 8 wanted by 
> driver supposedly ***
> (II) NVIDIA(0):     Mode Source: X Configuration file ModeLine
> (II) NVIDIA(0):       Pixel Clock      : 58.820 MHz
> (II) NVIDIA(0):       HRes, HSyncStart : 1152, 1184
> (II) NVIDIA(0):       HSyncEnd, HTotal : 1400, 1432
> (II) NVIDIA(0):       VRes, VSyncStart :  648,  661
> (II) NVIDIA(0):       VSyncEnd, VTotal :  668,  681
> (II) NVIDIA(0):       H/V Polarity     : +/+
> (II) NVIDIA(0):     BestFit Backend for "648p": 1920x1080
> (II) NVIDIA(0):     Mode is valid.
> 
> 
> Notice that BestFit Backend is 1920x1080 for 1240x700 and 1152x648, so 
> only the 720p specified by EDID will actually go into 720p on the TV.
> 
> 
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