Nvidia and Xorg.conf

[steveblezy]

Hi all,

I have a relatively fresh install of kubuntu 18 on a dell m4700 that has both a nvidia k2000 and intel intergrated video. i have installed the nvidia 390 series drivers and am currently running on them. In the past, I would add a few lines to the xorg.conf file, (triplebuffer and forcefullcompositiopipeline to help out with the video tearing. I took a look and could not find a xorg.conf file. As a side note, my interest is to run the nvidia drivers full time, so I do not care about switching between the nvidia and intels.

Is there any way I could safely add one and or do something to assist in removing some of the video tearing?

Any info or suggestions would be very useful

Steve

[GreyGeek]

There is an app, nvidia-settings, a tool for configuring the NVIDIA graphics driver, that has a gui icon in the System menu. Among other things it allows you to switcch between nvidia and your other GPU, make changes to xconf, etc. There is a widget called "Thermal Monitor" that allows you to place a GPU temp display on the panel so you can see how hot your GPU is getting.

[steveblezy]

The nvidia -settings was also installed when the drivers were installed. When under XServer Display Configuration, "Save to X Configuration file", I recieve a dialog saying "Failed to generate X config file" Under the lowest opting in the tool nvidia-settings configuration "save current configuration" button, when pressed a dialog open to save a .nvidia-settings-rc. Where do I save it? the dialog box option starts at my home directory?

[steveblezy]

Regardless of the settings that I use in the nvidia settings tool, nothing prevents the video tearing. The only thing that has ever helps in the past (on other distros) was to edit the xorg.cof file that i mentioned in the original post, but in kubuntu, there is no xorg.conf file.

[steveblezy]

I have a feeling that it is all about the sync to Vblank but I have tried every combination that i can think of. Nvidia vblank option off, KDE compositor Vbank on, Nvidia vblank on, kde compositor off, both on, both off. Nothing seems to make a difference in the tearing. It is almost as if neither kwin nor nvidia are syncing to vblank

[vinnywright]

look hear https://www.kubuntuforums.net/showth...l=1#post369780

VINNY

[jlittle]

look hear https://www.kubuntuforums.net/showth...l=1#post369780

The advice in that thread often says use kdesudo dolphin. On new 18.04 installs there's no kdesudo, and anyway dolphin refuses to run as root. But it's easy to achieve the same result by using kate to Save As... into the directory the advice says to copy to using dolphin, or copying using the command line with sudo cp.

[vinnywright]

The advice in that thread often says use kdesudo dolphin. On new 18.04 installs there's no kdesudo, and anyway dolphin refuses to run as root. But it's easy to achieve the same result by using kate to Save As... into the directory the advice says to copy to using dolphin, or copying using the command line with sudo cp.

true ,,,,,I should have mentioned that

VINNY

[oshunluvr]

Regardless of the settings that I use in the nvidia settings tool, nothing prevents the video tearing. The only thing that has ever helps in the past (on other distros) was to edit the xorg.cof file that i mentioned in the original post, but in kubuntu, there is no xorg.conf file.

Correct, there isn't one. That doesn't prevent you from writing one, however this is not the preferred way to insert sections in into Xorg when it launches. The "correct" way is to use /etc/X11/xorg.conf.d and put files in there for each section of the old xorg.conf that you need. For example I have;

$ cat /etc/X11/xorg.conf.d/20-device.conf 
Section "Device"
    Identifier  "device0"
    Driver  "nvidia"
    VendorName  "nVidia Corporation" 
    BoardName "GeForce GTX 780"
    Option  "UseEvents"  "false"
    Option  "Coolbits" "12"
    Option  "TripleBuffer" "True"
#                + Enables triple buffering. "Decreases the time an application stalls while waiting for vblank events, but increases latency slightly" (NVIDIA Readme) 
EndSection

and;

$ cat /etc/X11/xorg.conf.d/40-monitor.conf 
Section "Monitor"
    Identifier  "Monitor0"
    VendorName  "Acer"
    ModelName   "XRC382CQK"
    Option      "UseEdidDpi" "false"
    Option      "DPI" "110 x 110"
EndSection