Wrong screen resolution with nvidia-settings

[WDYSUN]

Dear All

I have an NVIDIA GeForce GT 740 graphic card and DELL U2715H monitor, my system is a fresh Ubuntu 14.04 LTS.


Dell suggest to use the monitor at the following resolution: 2560x1440 (60Hz). Running the nvidia settings

gksudo nvidia-settings

I am not able to select that resolution, the maximum it allows to set is: 2048x1152, in fact this is the content of my "/etc/X11/xorg.conf"

# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings:  version 331.20  (buildd@roseapple)  Mon Feb  3 15:07:22 UTC 2014

# nvidia-xconfig: X configuration file generated by nvidia-xconfig
# nvidia-xconfig:  version 304.125  (buildmeister@swio-display-x64-rhel04-14)  Mon Dec  1 21:18:22 PST 2014

Section "ServerLayout"
    Identifier     "Layout0"
    Screen      0  "Screen0" 0 0
    InputDevice    "Keyboard0" "CoreKeyboard"
    InputDevice    "Mouse0" "CorePointer"
    Option         "Xinerama" "0"
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"
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "DELL U2715H"
    HorizSync       30.0 - 113.0
    VertRefresh     56.0 - 86.0
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "Unknown"
EndSection

Section "Screen"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "Stereo" "0"
    Option         "nvidiaXineramaInfoOrder" "DFP-1"
    Option         "metamodes" "2048x1152_60 +0+0"
    Option         "SLI" "Off"
    Option         "MultiGPU" "Off"
    Option         "BaseMosaic" "off"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

How can I set the optimal resolution? Does it suffice to replace

Option         "metamodes" "2048x1152_60 +0+0"

with

Option         "metamodes" "2560x1440_60 +0+0"

in my "/etc/X11/xorg.conf"? What does that "+0+0" means?


Thanks
Pierre

[dino99]

nowadays the kernel directly deals with X; and a simple typo inside a non needed xorg.conf can push unpredictable troubles
about the resolution, 3 conditions needs to be validated: the card/chipset is able to display it, the screen interface used needs to be able too, then the cord

[WDYSUN]

nowadays the kernel directly deals with X; and a simple typo inside a non needed xorg.conf can push unpredictable troubles
about the resolution, 3 conditions needs to be validated: the card/chipset is able to display it, the screen interface used needs to be able too, then the cord

Hello Dino99

from specs I can see that the card can deal with that resolution, regard the other two:

1. by "cord" you mean the hdmi cable? Can it really be?

2. I am not sure what you mean by "the screen interface used needs to be able too"

so what I should do?

Regards
P

[WDYSUN]

... I should also tell you that I am working with Ubunutu packed drivers for the Nvidia card. I also tried the Nvidia proprietary drivers and the issue disappear (nvidia-setting in that case properly recognizes the max screen resolution), although I get some instability that forced me to get back to Ubuntu-Nvidia drivers.

Regards
P