[mythtv-users] Modeline works in Powerstrip/Windows, but not in Xorg/Linux
James Buckley
xanium4332 at googlemail.com
Sat Dec 23 12:20:50 UTC 2006
Hi all,
Basically, I have a problem...
I have my MythTV box connected to my TV using a DVI link (striaght
DVI->DVI, no HDMI, converters or anything like that). My TV has two
modes for the DVI connection, DVI-PC and DVI-DTV (It's an LG 37LP1D).
When switched to DVI-PC mode, I can output almost any resolution I
like and get a picture (it even outputs the correct E-DID info to let
me get 1:1 pixel mapping, and no overscan). However, this ability
comes at a price.
It seems that the TV drops frames, as watching video is impossible,
and dragging windows clearly shows a terrible frame rate. I know this
is a problem with the TV (as I'll explain later). Obviously I
want/need to use the DVI-DTV mode on the TV, however that dragged in
the typical problem of getting the correct modeline. The TV outputs
the same E-DID info as when switched to the DVI-TV mode, but none of
the generated resolutions work. I guessed that when in the DVI-DTV
mode, my TV expects stricter modelines, but won't drop any frames.
My guess was correct. I loaded up XP on my box, installed powerstrip,
and using one of it's default/inbuilt resolutions/modelines (the
1280x720 (DTV)) I actually managed to get a picture when in the DTV of
my TV. You can clearly see a difference between the two modes. In PC
mode, no overscan, low framerate. In DTV mode, little overscan, high
framerate (things are actually smooth, and video's watchable).
OK, all I needed to do is cut and paste the modeline from powerstrip
to Xorg. No problem, so I generated the modeline from Powerstrip
(using the copy to clipboard thing), and pasted it into my xorg.conf.
Now here's the problem: no picture (at least not in DTV mode). I've
checked all the logs, and the modeline is confirmed, correct, accepted
and applied, but I don't get any picture.
Now, here's my question, does anybody know why this is? I've been
working on this project since Easter, and this is the only problem I
have left (but quite a severe one). I'd really like to have a pure
digital connection, as the component (yes, component) out from my
motherboard (an MSI K8NGM2-FID), isn't very good.
If anyone has an idea as to why all this is, or has any info at all
regarding the subject/problem, pleaassseee speak up.
Thanks in advance, James
P.S. I've posted my xorg.conf, just in case somebody notices anything
wrong / problematic. Oh, and I'm running on Gentoo, using the nvidia
1.0.9631 binary drivers.
---------------------------
xorg.conf
---------------------------
Section "ServerLayout"
Identifier "X.org"
Screen 0 "Screen" 0 0
InputDevice "Mouse" "CorePointer"
InputDevice "Keyboard" "CoreKeyboard"
EndSection
Section "Files"
RgbPath "/usr/share/X11/rgb"
ModulePath "/usr/lib/xorg/modules"
FontPath "/usr/share/fonts/misc/"
FontPath "/usr/share/fonts/TTF/"
FontPath "/usr/share/fonts/OTF"
FontPath "/usr/share/fonts/Type1/"
FontPath "/usr/share/fonts/CID/"
FontPath "/usr/share/fonts/100dpi/"
FontPath "/usr/share/fonts/75dpi/"
EndSection
Section "Module"
Load "extmod"
Load "dbe"
Load "record"
Load "xtrap"
#Load "dri"
Load "glx"
Load "freetype"
Load "type1"
EndSection
Section "InputDevice"
Identifier "Keyboard"
Driver "kbd"
EndSection
Section "InputDevice"
Identifier "Mouse"
Driver "mouse"
Option "Protocol" "auto"
Option "Device" "/dev/input/mice"
Option "ZAxisMapping" "4 5 6 7"
EndSection
Section "Monitor"
Identifier "TV"
VendorName "LG"
ModelName "37LP1D"
Option "ModeValidation" "NoMaxSizeCheck,
NoHorizSyncCheck, NoVertR
efreshCheck"
Option "DPMS"
VertRefresh 56-75
HorizSync 31-70
DisplaySize 325 182
Modeline "720p" 77.50 1280 1600 1648 1648 720 720 725 748
+hsync +vsync
EndSection
Section "Device"
Identifier "GFX Card"
Driver "nvidia"
VendorName "nVidia Corporation"
BoardName "C51PV [GeForce 6150]"
BusID "PCI:0:5:0"
VideoRam 65536
Option "NoLogo" "true"
Option "ConnectedMonitor" "DFP"
EndSection
Section "Screen"
Identifier "Screen"
Device "GFX Card"
Monitor "TV"
DefaultDepth 24
SubSection "Display"
Viewport 0 0
Depth 24
Modes "720p"
EndSubSection
EndSection
Section "dri"
Mode 0666
EndSection
---------------------------
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