Different Unichrome family display drivers
The VIA proprietary drivers
These are considered unstable and insecure. They are however the only way to get any form of 3D acceleration or even reliable modesetting on certain chipsets, and can be installed using the via-chrome9-dkms, xf86-video-via-chrome9 & via-chrome9-dri packages from the AUR.
The OpenChrome driver
The most advanced and developed driver for Unichromes. Supports CLE266, KM400/KN400/KM400A/P4M800, CN400/PM800/PN800/PM880, K8M800, CN700/VM800/P4M800Pro, CX700, P4M890, K8M890 and P4M900/VN896 chipsets. Accelerates 2D, 3D, Xvideo and mpeg2 decoding using XvMC. This driver is the only way to go if you want to be on the bleeding edge.
You can install the OpenChrome driver with command:
pacman -S xf86-video-openchrome
xorg.conf driver name is
Black screen when booting from LiveCD
If you experience a black screen when booting from Live-CD, place the following paramenter to the end of the kernel load options (please note that
nomodeset option probably won't work here)
After installing the system you'll need to blacklist
viafb module. Just create a file /etc/modprobe.d/blacklist.conf with the following line:
To enable any of the following options to fix issues, first create a new file 10-openchrome.conf in /etc/X11/xorg.conf.d/:
Section "Device" Identifier "My Device Name" Driver "openchrome" EndSection
If your X-Server shows artifacts and fails to redraw some windows, try disabling the "EnableAGPDMA" option:
Option "EnableAGPDMA" "false"
If your machine freeze at startup (GDM) or after login (slim), try adding the XAA option "XaaNoImageWriteRect". Note that this only applies if you are using the XAA acceleration method (configured by the "AccelMethod" option). As of 0.2.906, the default acceleration method is EXA.
If you experience significant CPU usage and low UI framerate, try adding:
Option "AccelMethod" "XAA"
VIA Technologies, Inc. CN896/VN896/P4M900 [Chrome 9 HC]
The EXA acceleration method may cause significant CPU usage and low UI framerate. Refer to the "AccelMethod" option in the #Troubleshooting section.
Unichrome and OpenGL
OpenGL support for Via's graphic chipsets is seriously outdated. At the moment you will not be able to run more fancy applications, games or compositing desktops like Compiz Fusion that rely on OpenGL as a backend, because the more recent OpenGL extensions are not yet supported in Unichrome 3D driver. You will be able to run simple OpenGL-applications though. The 3D driver for Unichrome is provided by the the DRI project.
Install unichrome-dri, libgl and mesa -packages to get OpenGL to work.
If you experience problems with DPMS not turning off laptop's backlight, try adding:
Option "VBEModes" "true"
to the device section of
Hangup on exit
If your computer crashes when closing X, you may try not using vesa driver for kernel console. Just delete the vga stuff from kernel line on grub or append line on lilo.