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Old 01-16-2010, 08:22 PM   #1
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Registered: Jan 2010
Posts: 1

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Force a screen resolution in Ubuntu when using UseEDID False

Hi All,

I wonder if anyone can help, I've got an annoying problem with an Acer Revo running Ubuntu 9.10 with the latest NVidia drivers.

The Revo is connected to my TV via an amp by HDMI. The Revo didn't seem to like this, I'm assuming due to some handshaking issue with the HDMI which meant that no signal was being passed. Therefore, in Xorg.conf I have used
Option    	"UseEDID"    	"False"
This makes the a picture appear but the highest resolution available is 640x480 (if I connect directly to my TV and comment out the "UseEDID" line the resolution is the proper 1920x1080).

I have tried editing xorg.conf (the file is posted at the bottom) to force 1920x1080 resolution but nothing seems to work.

Can anyone help with any suggestions?

# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings:  version 1.0  (buildd@palmer)  Sun Feb  1 20:21:04 UTC 2009

Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0" 0 0
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"

Section "Files"

Section "Module"
    Load           "dbe"
    Load           "extmod"
    Load           "type1"
    Load           "freetype"
    Load           "glx"

Section "ServerFlags"
    Option         "Xinerama" "0"

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

Section "InputDevice"
    # generated from default
    Identifier     "Keyboard0"
    Driver         "kbd"

Section "Monitor"
    # HorizSync source: edid, VertRefresh source: edid
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "LG TV"
    HorizSync       31.0 - 84.0
    VertRefresh     57.0 - 75.0
    Option         "DPMS"
	Modeline	"1920x1080_60.00"  173.00  1920 2048 2248 2576  1080 1083 1088 1120 -hsync +vsync
	Option		"PreferredMode"	"1920x1080_60.00"

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "ION"
	Option	"UseEDID"	"FALSE"

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "TwinView" "0"
    Option         "metamodes" "1920x1080 +0+0"
    SubSection     "Display"
        Depth       24
	Modes	"1920x1080"
Old 01-17-2010, 06:59 PM   #2
Registered: Jul 2009
Distribution: Slackware
Posts: 116

Rep: Reputation: 50
Where did you get the modeline values?

Try running:
startx -- -logverbose 6 (You'll have to boot into the CLI instead of GUI, although I think there is somewhere you can change the log level for booting - Just change /etc/inittab to use runlevel 3)
Then /var/log/Xorg.0.log should have the EDID values recorded - use them to generate the modeline.

If that doesn't work, try playing with xrandr after boot (xrandr allows you to change video settings without having to reboot).

Here's a script I run after startup: (I have an ATI card, so will likely be different for your setup)
xrandr --newmode "1920x1200" 154.00 1920 1968 2000 2080 1200 1203 1209 1235 -hsync +vsync
xrandr --addmode DVI-1 1920x1200
xrandr --output DVI-0 --mode 1920x1080 --pos 1920x0 --output DVI-1 --mode 1920x1200 --left-of DVI-0

Last edited by sysfce2; 01-17-2010 at 07:01 PM.


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