I need to use fbdev driver(framebuffer) in Xorg to get better system latency.
So I use "Xorg :1 -configure" to get the default xorg.conf file. Then change the "Device" part, and copy xorg.conf to /etc/X11. Reboot Ubuntu.
/etc/X11/xorg.conf
Section "Device"
### Available Driver options are:-
### Values: <i>: integer, <f>: float, <bool>: "True"/"False",
### <string>: "String", <freq>: "<f> Hz/kHz/MHz",
### <percent>: "<f>%"
### [arg]: arg optional
#Option "ShadowFB" # [<bool>]
#Option "Rotate" # <str>
#Option "fbdev" # <str>
#Option "debug" # [<bool>]
Identifier "Card0"
#Driver "vmware"
Driver "fbdev"
BusID "PCI:0:15:0"
EndSection
In Ubuntu 16.04.6 , it works in this way. Sadly, in Ubuntu 18.04.4, it dosen't.
//Ubuntu 16.04.6
hust@hust-pc:~$ inxi -G
Graphics: Card: VMware SVGA II Adapter
Display Server: X.Org 1.19.6 driver: fbdev
Resolution: 800x600@0.00hz
GLX Renderer: llvmpipe (LLVM 6.0, 256 bits)
GLX Version: 3.0 Mesa 18.0.5
//Ubuntu 18.04.4
hust@hust-virtual-machine:~$ inxi -G
Graphics: Card: VMware SVGA II Adapter
Display Server: x11 (X.Org 1.20.5 ) drivers: vmware (unloaded: modesetting,fbdev,vesa)
Resolution: 2880x1520@60.00hz
OpenGL: renderer: SVGA3D; build version: 3.3 Mesa 19.2.8
I try to degrade the Xorg version in Ubuntu 18.04, but it causes the Xorg to hang sometimes.Then I try it in vmvare machine.
How can I change the Xorg driver to fbdev in Ubuntu 18.04?