interesting overscan problem

frieza · 11-24-2010, 09:14 PM

running ubuntu 10.04 with nvidia-driver 195.36.24 and kernel 2.6.32-26-generic
i have 2 displays, a main monitor and a video display attached via composite video out

the problem is of course tvs often overscan

yes the nvidia-settings panel has an overscan slider and that does work to a point, but... the screen in question overscans more to the left and bottom then to the top or right, thus when i adjust the slider i see a border on the top and right before the bottom and left of the image reach the physical edge of the screen
can anyone suggest a modeline for starters that might get me in the right direction?

my xorg.conf is as follows

Code:

# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings:  version 1.0  (buildd@yellow)  Fri Apr  9 11:51:21 UTC 2010


Section "ServerLayout"

# Removed Option "Xinerama" "0"
    Identifier     "Layout0"
    Screen      0  "Screen0" 0 0
    Screen      1  "Screen1" RightOf "Screen0"
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"
    Option         "Xinerama" "1"
EndSection

Section "Files"
EndSection

Section "InputDevice"

    # generated from default
    Identifier     "Mouse0"
    Driver         "mouse"
    Option         "Protocol" "auto"
    Option         "Device" "/dev/psaux"
    Option         "Emulate3Buttons" "no"
    Option         "ZAxisMapping" "4 5"
EndSection

Section "InputDevice"

    # generated from default
    Identifier     "Keyboard0"
    Driver         "kbd"
EndSection

Section "Monitor"

    # HorizSync source: edid, VertRefresh source: edid
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "DELL E772c"
    HorizSync       30.0 - 70.0
    VertRefresh     50.0 - 160.0
    Option         "DPMS"
EndSection

Section "Monitor"

    # HorizSync source: edid, VertRefresh source: edid
    Identifier     "Monitor1"
    VendorName     "Unknown"
    ModelName      "TV-0"
    HorizSync       30.0 - 71.0
    VertRefresh     50.0 - 160.0
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce 8500 GT"
    BusID          "PCI:1:0:0"
    Screen          0
EndSection

Section "Device"
    Identifier     "Device1"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce 8500 GT"
    BusID          "PCI:1:0:0"
    Screen          1
EndSection

Section "Screen"

# Removed Option "metamodes" "CRT-0: 1280x1024 +0+0; CRT-0: 1280x960 +0+0"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "TwinView" "0"
    Option         "TwinViewXineramaInfoOrder" "CRT-0"
    Option         "metamodes" "CRT: 1280x1024 +0+0; CRT: 1280x960 +0+0"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

Section "Screen"

# Removed Option "metamodes" "CRT-1: 1280x1024 +0+0; CRT-1: 400x300 +0+0; CRT-1: 320x240 +0+0"
    Identifier     "Screen1"
    Device         "Device1"
    Monitor        "Monitor1"
    DefaultDepth    24
    Option         "TwinView" "0"
    Option         "metamodes" "TV: 1024x768 +0+0; TV: 320x240 +0+0"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

p.s. if this belongs in software I apologise in advance

business_kid · 11-25-2010, 08:57 AM

xorg.conf looks good.
The first thing I'd try is adjusting the offset on the monitor itself, and see if you can sort it that way.

But you can add a few things to the monitor section. You can specify the screen size (mmxmm), from which dpi is calculated. HorizSync, VertRefresh, and even a mode or three where yopu can correct timings. Man xorg.conf.

frieza · 11-25-2010, 10:44 AM

not sure of those things, the model number of the display is a3m0039 if that helps

business_kid · 11-26-2010, 02:32 AM

No, it doesn't.
But if you read the labelling, take out a ruler, google or (when all else fails) Look at the specs in the monitor's handbook, you'll get them