Help with display settings
#1
Question 
Hi,

I have a Samsung 40" LED TV which reports 1920x1080 @ 60 when XBMC starts up. In the display settings in XBMC (Live 9.11), the default value is set to 1920x1080 @ 50 and no value is available for 1920x1080@60 to select which I assume is the setting I should use.

Is this actually an issue or not ? I am not really experiencing any problems with the picture quality other than the occasional "stutter" when playing back 720 and 1080 mkv files which appears to be frames being dropped.

I have looked at the guide "[LINUX] HOW-TO setup XBMC and Linux with correct resolution (xorg.conf) " which refers to 9.04 and I am not sure this is applicable in 9.11. For example, I can not find a xorg.conf file in my /etc/X11 directory.

Would like to understand how much effort I should put into this, would changing the display setting to 1920x1080 @ 60 make any difference ? and if so, a pointer to where I can find some info on what I need to do for 9.11 would be very useful

Thanks

Niclas
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#2
My guess is that you have a nvidia card and that the twinview option is enabled.

If so, try adding this in the device section of your xorg.conf

Option "DynamicTwinView" "false"
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#3
Thanks for the quick response. Yes, the box is an Acer Aspire Revo 3610 with Nvidia ION.

Apologies, but my Linux knowledge is limited. My understanding is that xorg.conf should be located in /etc/X11/ but I can not find that file there. There is a file called XF86Config in the directory which seem to contain similar settings and have a "Device" section, is this the equivalent file to xorg.conf ?
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#4
Tried to update the /etc/X11/XF86Config file, but the file appears to be re-generated at reboot so setting disappears when i reboot the box. Am I editing the wrong file or am I doing something wrong in the way I am editing it ?

sudo pico /etc/X11/XF86Config
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#5
This command should generate the xorg.conf file:
Code:
sudo nvidia-xconfig -s –no-logo –force-generate
Or try this if it don't work:
Code:
sudo cp /etc/X11/XF86Config /etc/X11/xorg.conf
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#6
Big Grin 
Great,

Found an xorg.config on another thread with same Samsung LED TV as I have (only a size bigger) so updated XF86Config, saved it as xorg.config with the this content in relevant sections

Quote:Section "Monitor"
Identifier "Monitor0"
VendorName "SAMSUNG"
ModelName "UE46B7070"
HorizSync 26.0 - 81.0
VertRefresh 24.0 - 75.0
ModeLine "1920x1080@60p" 148.50 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync
ModeLine "1360x768@60p" 85.50 1360 1424 1536 1792 768 771 777 795 +hsync +vsync
ModeLine "1280x720@60p" 74.25 1280 1390 1430 1650 720 725 730 750 +hsync +vsync
ModeLine "1280x720@50p" 74.25 1280 1720 1760 1980 720 725 730 750 +hsync +vsync
ModeLine "1920x1080@50i" 74.25 1920 2448 2492 2640 1080 1084 1094 1124 +hsync +vsync Interlace
ModeLine "1920x1080@60p2" 148.35 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync
ModeLine "1920x1080@50p" 148.50 1920 2448 2492 2640 1080 1084 1094 1124 +hsync +vsync
ModeLine "1280x720@60p2" 74.18 1280 1390 1430 1650 720 725 730 750 +hsync +vsync
ModeLine "1280x720@50p2" 74.25 1280 1720 1760 1980 720 725 730 750 +hsync +vsync
ModeLine "1920x1080@60i" 74.18 1920 2008 2052 2200 1080 1084 1094 1124 +hsync +vsync Interlace
ModeLine "1920x1080@50i2" 74.25 1920 2448 2492 2640 1080 1084 1094 1124 +hsync +vsync Interlace
ModeLine "720x480@60p" 27.00 720 736 798 858 480 489 495 525 -hsync -vsync
ModeLine "720x576@50p" 27.00 720 732 796 864 576 581 586 625 -hsync -vsync
ModeLine "1920x1080@24p" 74.16 1920 2558 2602 2750 1080 1084 1089 1125 +hsync +vsync
ModeLine "1920x1080@25p" 74.25 1920 2448 2492 2640 1080 1084 1089 1125 +hsync +vsync
ModeLine "1920x1080@30p" 89.01 1920 2448 2492 2640 1080 1084 1089 1125 +hsync +vsync
ModeLine "1152x864@75p" 108.00 1152 1216 1344 1600 864 865 868 900 +hsync +vsync
ModeLine "1280x800@60p" 83.5 1280 1352 1480 1680 800 803 809 831 -hsync +vsync
ModeLine "1280x960@60p" 108.00 1280 1376 1488 1800 960 961 964 1000 +hsync +vsync
ModeLine "1280x1024@60p" 108.00 1280 1328 1440 1688 1024 1025 1028 1066 +hsync +vsync
ModeLine "1440x900@60p" 106.50 1440 1520 1672 1904 900 903 909 934 -hsync +vsync
ModeLine "1440x900@75p" 136.75 1440 1536 1688 1936 900 903 909 942 -hsync +vsync
ModeLine "1680x1050@60p" 146.25 1680 1784 1960 2240 1050 1053 1059 1089 -hsync +vsync
ModeLine "640x480@60p" 25.18 640 648 744 800 480 482 484 525 -hsync -vsync
ModeLine "640x480@73p" 31.50 640 656 696 832 480 481 484 520 -hsync -vsync
ModeLine "640x480@75p" 31.5 640 656 720 840 480 481 484 500 -hsync -vsync
ModeLine "800x600@60p" 40.00 800 840 968 1056 600 601 605 628 +hsync +vsync
ModeLine "800x600@72p" 50.00 800 856 976 1040 600 637 643 666 +hsync +vsync
ModeLine "800x600@75p" 49.5 800 816 896 1056 600 601 604 625 +hsync +vsync
ModeLine "1024x768@60p" 65.00 1024 1048 1184 1344 768 771 777 806 -hsync -vsync
ModeLine "1024x768@70p" 75.00 1024 1048 1184 1328 768 771 777 806 -hsync -vsync
ModeLine "1024x768@75p" 78.75 1024 1040 1136 1312 768 769 772 800 +hsync +vsync
ModeLine "1280x1024@75p" 135.00 1280 1296 1440 1688 1024 1025 1028 1066 +hsync +vsync
Option "DPMS"
Option "ExactModeTimingsDVI" "TRUE"
EndSection

Section "Device"
Identifier "Device0"
Driver "nvidia"
VendorName "NVIDIA Corporation"
Option "ModeValidation" "NoEdidModes"
EndSection

Section "Screen"
Identifier "Screen0"
Device "Device0"
Monitor "Monitor0"
DefaultDepth 24
Option "NoLogo" "True"
Option "DynamicTwinView" "false"
SubSection "Display"
Depth 24
Modes "1920x1080@60p" "1360x768@60p" "1280x720@60p" "1280x720@50p" "1920x1080@50i" "1920x1080@60p2" "1920x1080@50p" "1280x720@60p2" "1280x720@50p2" "1920x1080@60i" "1920x1080@50i2" "720x480@60p" "720x576@50p" "1920x1080@24p" "1920x1080@25p" "1920x1080@30p" "1152x864@75p" "1280x800@60p" "1280x960@60p" "1280x1024@60p" "1440x900@60p" "1440x900@75p" "1680x1050@60p" "640x480@60p" "640x480@73p" "640x480@75p" "800x600@60p" "800x600@72p" "800x600@75p" "1024x768@60p" "1024x768@70p" "1024x768@75p" "1280x1024@75p"
EndSubSection
EndSection

And now XBMC is configured for 1920x1080 @ 60

Only done some initial tests, but quality appears super smooth with the occasional stuttering gone.

Many thanks for everyones help !

Niclas
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#7
Apologies for resuming this thread, but appears that something is still not right. Just noticed when I start a movie, the TV changes its resolution to 1920x1080@24.

xorg.conf

http://pastebin.com/m3d6be142

Logfile generated as per "[LINUX] HOW-TO setup XBMC and Linux with correct resolution (xorg.conf) "

http://pastebin.com/mc544b3b

If anyone can help we work out ehat I need to do to playback my movies at 1920x1080@60 it would be much appreciated

Thanks

Niclas
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#8
Disable the adjust refresh rate option in XBMC.

Settings->Video->Playback
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#9
Ah, that explains why I didnt notice this first. Was playing around with the settings and switched this option on, not understanding what the setting was doing

Many thanks !

Niclas
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