Configuring resolution via xorg.conf
|xorg table of contents:|
|Configuration guides:||Modeline references:|
The xorg.conf is a integral part of running Kodi in X via for e.g. xinit in some controllable manner. While in recent Linux the device drivers have improved considerably and deem xorg.conf unneeded, it still has its niche.
If you ever had problems getting the correct resolution or correct modelines on your HTPC this is an easy guide. You can also use this guide to tweak 23.976p and 24p modelines for smoother playback..
This instructions and methods outlined here should be quite "generic", use this guide on your own risk. if you end up without a picture on your screen restore the backup xorg.conf or rename existing if no backup exists. References
3 Preparing xorg.conf for tweaking
Backing up any existing xorg.conf is a integral step in assuring your can revert any errors.
cp /etc/X11/xorg.conf /etc/X11/xorg.conf.bak
Then generate a new clean xorg.conf to have a base which to build on later,
sudo nvidia-xconfig -s --no-logo --no-composite --no-dynamic-twinview --force-generate --output-xconfig=/etc/X11/xorg.conf
|3|| Now we need to edit the new xorg.conf to add some options.
sudo nano /etc/X11/xorg.conf
then add the following lines in the correct section of that file:
Section "monitor" Option "ExactModeTimingsDVI" "true" Option "DPI" "96 x 96" Option "DPMS" "false"
|4|| The validation lines vary from setup to setup and depend very much on how well your TV handles EDID,
Telling xorg to ignore EDID may result in low resolution being shown in xbmc, if you dont offer correct and valid modelines for xbmc-xandrc to pick from. In this example we are not disabling EDID data. We definitely dont want vesa modes or xserver modes
Section "Device" Option "ModeValidation" "NoVesaModes, NoXServerModes"
3.1 Refresh rate & Modelines values
These are very important values to get right.
|1|| Now we need to figure out what kind of HorizSync/VertRefresh and resolution your TV/AVR supports by its EDID info:
Kill xbmc if it's running by
sudo stop xbmc
Then we need to setup a logfile which logs your TV/AVR EDID modes:
cd ~ sudo X -verbose 6 > ~/xlog.txt 2>&1
This process needs interrupting via Ctrl+C after a few seconds.
In the root of your home directory you will find a xlog.txt
|2|| Open the |
(II) NVIDIA(0): Frequency information for SAMSUNG (DFP-0): (II) NVIDIA(0): HorizSync : 26.000-76.000 kHz (II) NVIDIA(0): VertRefresh : 23.000-61.000 Hz (II) NVIDIA(0): (HorizSync from EDID) (II) NVIDIA(0): (VertRefresh from EDID)
Write Down or make a note of the HorizSync and VertRefresh values.
|3|| Browse further on |
(II) NVIDIA(GPU-0): Validating Mode "1920x1080": (II) NVIDIA(GPU-0): 1920 x 1080 @ 24 Hz (II) NVIDIA(GPU-0): Mode Source: EDID (II) NVIDIA(GPU-0): Pixel Clock : 74.16 MHz (II) NVIDIA(GPU-0): HRes, HSyncStart : 1920, 2558 (II) NVIDIA(GPU-0): HSyncEnd, HTotal : 2602, 2750 (II) NVIDIA(GPU-0): VRes, VSyncStart : 1080, 1084 (II) NVIDIA(GPU-0): VSyncEnd, VTotal : 1089, 1125 (II) NVIDIA(GPU-0): H/V Polarity : +/+ (II) NVIDIA(GPU-0): Viewport 1920x1080+415+22 (II) NVIDIA(GPU-0): Horizontal Taps 0 (II) NVIDIA(GPU-0): Vertical Taps 0 (II) NVIDIA(GPU-0): Base SuperSample x1 (II) NVIDIA(GPU-0): Base Depth 32 (II) NVIDIA(GPU-0): Distributed Rendering 1 (II) NVIDIA(GPU-0): Overlay Depth 32 (II) NVIDIA(GPU-0): Mode is valid.
|4|| To create a modeline from this is easy. From my example above the first line would be "1920x1080" and then 74.25 and then 1920 2008 and 2052 2200 and so on. you just read the values from top to bottom.
So in this example the modeline that section gives me would be:
ModeLine "1920x1080_24" 74.16 1920 2558 2602 2750 1080 1084 1089 1125 +hsync +vsync
3.2 Assembling your xorg.conf
Now that we got both HorizSync and VertRefresh and a working modeline lets put it in our xorg.conf.
|1|| Issue from terminal:
sudo nano /etc/X11/xorg.conf
|2|| Then add from what you wrote down earlier.
Section "Monitor" HorizSync 15 - 50 VertRefresh 48 - 62 ModeLine "1920x1080" 74.25 1920 2008 2052 2200 1080 1084 1094 1124 +hsync +vsync Interlace
(or edit the ones there already if your xorg.conf already contains some modelines)
SubSection "Display" Modes "1920x1080"
|3||Now close and save the file by hitting Ctrl+X on your keyboard. Then press Y followed by ↵ Enter|
|4|| Start xbmc by running it:
sudo xbmc start
You should get a nice correct screen, make sure to go into settings - screen and calibrate/adjust your new resolution.
If not try another modeline using same methods and see if that works.
|See the HOW-TO setup Kodi and Linux with correct resolution for discussion and more information.|