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Top 15 monitor interview questions

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How do I set the correct monitor resolution with Nvidia drivers for a monitor that does not send EDID?

I keep having trouble getting the correct monitor resolution - every time I reinstall, I happen to use a newer Ubuntu release and the old tricks I used to know no longer work. Instead of leaving a long trail of questions for every new release, I am looking for a more universal and timeless solution.

What's the correct way to set the correct monitor resolution with an Nvidia GPU for a screen that does not send EDID values?

Note: This is a "dummy" question -- with the help from the chat, I already found the answer, and I am now going to add my own answer to document a solution that is hopefully universal.


Source: (StackOverflow)

frequency out of range - please change display mode

I just downloaded the latest version of the Ubuntu live CD, and have installed it on a desktop computer (a Fujitsu Scaleo P). Once installed it seems to work perfectly, although there are some updates recommended in the Update Manager.

My problem is that, after having installed these updates and restarted the computer, I get this message on my monitor, and no Ubuntu interface is visible:

frequency out of range - please change display mode

I do not know how to change this when I can't access an interface. Is there a command that will bypass trying to boot the GUI and let me change the display mode via a CLI? I am brand new to Ubuntu and any help on this would be much appreciated.


Source: (StackOverflow)

How do I look up the hsync/vsync values for my monitor?

I'm trying to get my computer to use the correct resolution. For that I need to specify the horizontal and vertical sync values in the configuration file (xorg.conf):

Section "Monitor"  
  Identifier     "Monitor0"  
  VendorName     "Unknown"  
  ModelName      "CRT-0"  
  HorizSync       31.0 - 81.0  
  VertRefresh     56.0 - 76.0  
  Option         "DPMS"  
EndSection

Let's say these values for HorizSync and VertRefresh are somehow wrong for my monitor.
Where do I find the correct values?

Note: This is a "dummy" question -- with the help from the chat, I already found part of the answer, and I am now going to add my own answer to document a solution that is hopefully universal.


Source: (StackOverflow)

How do I set the native resolution on an HP Mini 210-1004sa?

FYI: My Netbook model is HP Mini 210-1004sa, which comes with Intel Graphics Media Accelerator 3150, and has a display 10.1" Active Matrix Colour TFT 1024 x 600.

I recently removed Windows 7 Starter from my netbook, and replaced it with Ubuntu 12.10.

The problem is the OS doesn't seem to recognise the native display resolution of 1024x600 i.e. the bottom bits of Ubuntu is hidden beneath the screen & the only 2 available resolutions are: the default 1024x768 and 800x600.

I've also thought about replacing Ubuntu with Lubuntu or Puppy Linux, as the system does run a bit slow, but I can't, as then I won't be able to access the taskbar and application menu which will be hidden beneath the screen. Only Ubuntu with Unity is currently usable, as the Unity Launcher is visible enough.


I was able to define a custom resolution 1024x600 using the Q&A:

but when I set that resolution, there appears a black band at the top of the screen and the desktop area is lowered, with bits of it hidden beneath the screen. I tried leaving it at this new resolution and restarting the system to see if the black band would disappear & the display will fit correctly, but it gets reset to 1024x768 at startup and displays following error:

Could not apply the stored configuration for monitors

none of the selected modes were compatible with the possible modes:

Trying modes for CRTC 63
CRTC 63: trying mode 800x600@60Hz with output at 1024x600@60Hz (pass 0)
CRTC 63: trying mode 800x600@56Hz with output at 1024x600@60Hz (pass 0)
CRTC 63: trying mode 640x480@60Hz with output at 1024x600@60Hz (pass 0)
CRTC 63: trying mode 1024x768@60Hz with output at 1024x600@60Hz (pass 1)
CRTC 63: trying mode 800x600@60Hz with output at 1024x600@60Hz (pass 1)
CRTC 63: trying mode 800x600@56Hz with output at 1024x600@60Hz (pass 1)
CRTC 63: trying mode 640x480@60Hz with output at 1024x600@60Hz (pass 1)
Trying modes for CRTC 64
CRTC 64: trying mode 1024x768@60Hz with output at 1024x600@60Hz (pass 0)
CRTC 64: trying mode 800x600@60Hz with output at 1024x600@60Hz (pass 0)
CRTC 64: trying mode 800x600@56Hz with output at 1024x600@60Hz (pass 0)
CRTC 64: trying mode 640x480@60Hz with output at 1024x600@60Hz (pass 0)
CRTC 64: trying mode 1024x768@60Hz with output at 1024x600@60Hz (pass 1)
CRTC 64: trying mode 800x600@60Hz with output at 1024x600@60Hz (pass 1)
CRTC 64: trying mode 800x600@56Hz with output at 1024x600@60Hz (pass 1)
CRTC 64: trying mode 640x480@60Hz with output at 1024x600@60Hz (pass 1)

Update

Making progress!

I tried setting nomodeset, i915.modeset=1, and i915.modeset=0, respectively; in Grub.

With nomodeset in Grub, I can now see, and permanently set the 1024x600 resolution I created much earlier without any errors. However, the display is squished, and the bottom bit of the OS is still hidden beneath the screen, & I think it has something to do with aspect ratio. I think it might have something to do with the fact that 1024x600 is the only mode with aspect ratio set to 16:9. How do I change it to 4:3 so it fits?

Though slightly insignificant, it is worth saying that with nomodeset enabled, the OS graphics is a bit slower.


Source: (StackOverflow)

How can I mirror/flip display output?

For strange reasons best not asked, I have a projector plugged into my computer that is pointed at a mirror. So the computer image is displayed on a wall, but it is mirrored.

In Linux(ubuntu) I can go to display preferences and set the external monitor to have a rotated image. Is there a clever way I could have it set to rotate/flip the image?


Source: (StackOverflow)

How to disable laptop's LCD and use external monitor as only output?

My laptop's LCD broke and I removed it. Now I permanently added a monitor via HDMI. How can I set up Ubuntu 12.10 to only use and show the external monitor and disable the LCD?

Right now, I cannot permanently increase the monitors resolution and I guess this problem would disappear if I disabled the LCD display.


Source: (StackOverflow)

Two monitors when only having one in 13.10

I just did a fresh install of Ubuntu 13.10 64bit, and it says that I have 2 monitors, when I actually only have one

enter image description here

I have a Dell XPS 15 with Nvidia graphics card if that helps in anyway


Source: (StackOverflow)

How can I make PDFs appear life-size when displayed at 100%?

When I open a letter size PDF and then zoom to 100%, the page physically displayed on my monitor is smaller than a real letter size sheet of paper.

How can I make "100%" on the computer screen correspond with "100%" in real life?

Details

This message suggests that I should be investigating the system-wide DPI settings for my monitor. xdpyinfo reports:

dimensions:    1024x768 pixels (271x203 millimeters)
resolution:    96x96 dots per inch

My monitor has a native display resolution of 1024x768 pixels and a diagonal display size of 12.07 inches. PX CALC returns the following information:

DPI: 106.05
Dot Pitch: 0.2395mm
Size: 9.66" × 7.24" (24.53cm × 18.39cm)

What I've tried so far

Running xrandr --dpi 106.05 successfully caused my PDF to appear actual size at 100%, but this effect was lost after rebooting.

To make the setting persistent I tried creating the following /etc/X11/xorg.conf:

Section "Monitor"
    Identifier   "ThinkPad X60 LCD"
    DisplaySize  245 183
EndSection

Section "Screen"
    Identifier "Screen0"
    Monitor    "ThinkPad X60 LCD"
EndSection

After re-logging in, /var/log/Xorg.0.log contained

[  1167.824] (**) intel(0): Display dimensions: (245, 183) mm
[  1167.824] (**) intel(0): DPI set to (106, 106)

but xdpyinfo still reported

dimensions:    1024x768 pixels (271x203 millimeters)
resolution:    96x96 dots per inch

and "100%" still appeared too small.


Source: (StackOverflow)

Could not apply the stored configuration for the monitor

I'm using Nvidia 7300 gt and monitor-Acer V173w, on 64 bit Ubuntu 10.04. Compiz and Emerald went well, but at the time of entry into the GUI, I always receive the message :
"Could not apply the stored configuration for the monitor, could not find a suitable configuration of screens"

Why do I always receive it, and what is wrong with the monitor configuration or pci-e is used?

enter image description here

root@dellph1-desktop:/# xrandr
Screen 0: minimum 320 x 240, current 1440 x 900, maximum 1440 x 900
default connected 1440x900+0+0 0mm x 0mm
   1440x900       50.0* 
   1024x768       51.0     58.0     59.0  
   1360x768       52.0     53.0  
   1152x864       54.0     55.0     56.0     57.0  
   960x600        60.0  
   960x540        61.0  
   896x672        62.0  
   840x525        63.0     64.0     65.0     66.0  
   832x624        67.0  
   800x600        68.0     69.0     70.0     71.0     72.0     73.0  
   800x512        74.0  
   720x450        75.0  
   680x384        76.0     77.0  
   640x512        78.0     79.0  
   640x480        80.0     81.0     82.0     83.0  
   576x432        84.0     85.0     86.0     87.0  
   512x384        88.0     89.0     90.0  
   416x312        91.0  
   400x300        92.0     93.0     94.0     95.0  
   320x240        96.0     97.0     98.0  
root@dellph1-desktop:/# 

=== xorg.conf

# nvidia-settings: X configuration file generated by nvidia-settings
# nvidia-settings:  version 260.19.29  (buildmeister@swio-display-x86-rhel47-04.nvidia.com)  Wed Dec  8 12:27:27 PST 2010


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"

    # HorizSync source: xconfig, VertRefresh source: xconfig
    Identifier     "Monitor0"
    VendorName     "Unknown"
    ModelName      "Acer V173W"
    HorizSync       30.0 - 83.0
    VertRefresh     55.0 - 75.0
    Option         "DPMS"
EndSection

Section "Device"
    Identifier     "Device0"
    Driver         "nvidia"
    VendorName     "NVIDIA Corporation"
    BoardName      "GeForce 7300 GT"
EndSection

Section "Screen"

# Removed Option "metamodes" " 1440x900_60 +0+0; 1280x1024 +0+0"
# Removed Option "metamodes" "1440x900 +0+0"
    Identifier     "Screen0"
    Device         "Device0"
    Monitor        "Monitor0"
    DefaultDepth    24
    Option         "TwinView" "0"
    Option         "TwinViewXineramaInfoOrder" "CRT-0"
    Option         "metamodes" "1440x900_75 +0+0; 1440x900 +0+0"
    SubSection     "Display"
        Depth       24
    EndSubSection
EndSection

Source: (StackOverflow)

How can I get a DisplayLink USB monitor work under Ubuntu?

I have a DisplayLink-based external USB monitor, which has both power and data over USB, and seems to work perfectly under Windows 7, but only can display a text console under Ubuntu 10.10, and that I can only use when I am actually switched to it. So the only Use I can have so far is to have some text-based monitoring or console that I can watch while working on the graphic display.

I know there are some development done for DisplayLink, but I never could get it to actually run properly.

Yes, I tried the detailed setup described in other posts, but they did not work, and instead crashed my X that I had to restore.

Merci :-)


Source: (StackOverflow)

Adding a CPU monitor widget in the top corner like in Gnome2

I wonder if you can add a widget or something like it in the top corner (next to volume and WiFi and things like that) that displays current use of CPU and maybe RAM. I know you could add stuff like that in Gnome2, altough I can't find a feature like that in Unity or Gnome3.


Source: (StackOverflow)

Stop an insolent narwhal from "correcting" monitor brightness?

I want total absolute control over the brightness of my laptop's screen. I want Natty to fear my wrath should it dare to presume my desire. Natty's light adjusting minions should quake in terror before my sword, apt-get purge!

But alas, this sword cuts an arm where I'd prefer lobotomy. I need a scalpel, some precise tool to cut into Natty's brain and enforce my will. Does such a tool exist? Is there known to the citizens of Ubuntu a method to restore my sovereign power?

Further investigation reveals Natty only auto-dims the screen when running loose on battery power. Chain the beast to an electrical outlet and it is tamed.

I see these two screens in Natty's Power Management, neither appear relevant:

Power Management Preferences - On AC Power Power Management Preferences - General


Source: (StackOverflow)

notify-osd and dual monitors

I use Ubuntu 10.10 on a laptop, with an external monitor, which is used as the primary. Notify-osd alerts show on the connected monitor, as I want.

However, some days ago I removed both gnome panels and installed AWN. All was good, but notify-osd alerts now appears on the laptop. I need, that notify-osd appears on the connected monitor.

How can I move notify-osd alerts on the connected monitor without gnome panels?


Source: (StackOverflow)

How can I get my laptop's monitor size?

What is the Ubuntu linux command to find laptop monitor size? I want to know in inches if possible.

Thanks


Source: (StackOverflow)

How to change the monitor's refresh rate?

How do I change the monitor's refresh rate in Oneiric?

There is no option to do it in the Displays dialog now. By default it's 60Hz, but I need 75Hz on my monitor.

In previous releases there used to be such an option in the Displays dialog.

Edit - Half baked solution

The best I could do so far was:

xrandr -s 1280x1024 -r 75

This is perfect, but my problem is that it isn't permanent. It defaults back to 60 Hz after logging out and back in.

Perhaps this should go into some script and added to startup? I just don't know how to do that.


Source: (StackOverflow)