Uvesafb

Revision as of 16:42, 12 July 2014 by Duncan.britton (Talk | contribs)

How to : Framebuffer: Userspace VESA VGA graphics support

Uvesafb is an improved framebuffer driver for Linux systems with some enhancements compared to vesa. Uvesafb can allow you to get a full-resolution console, even if you have installed a graphics driver that does not support full-resolution consoles. Examples of drivers like these: ati-drivers and NVidia-drivers.

Kernel configuration


Device Drivers ->
    <*> Connector - unified userspace <-> kernelspace linker  --->
    Graphics support ->
        [*] Support for frame buffer devices  --->
            [*] Enable firmware EDID
            Console display driver support ->
                [*] Video mode selection support
                [*] Video mode handling helpers
            Frame buffer hardware drivers
            [*] Userspace VESA VGA graphics support

Note

Build the kernel, do not install the kernel and modules. You can choose uvesafb as a module, unlike vesa.

Klibc

Next, we emerge dev-libs/klibc (package not on wiki - please add):

# emerge klibc

This step is necessary because klibc has to be compiled against a kernel that includes uvesafb. You need to do it only once.

v86d

sys-apps/v86d (package not on wiki - please add) is the userspace helper that runs x86 code in emulated environment. Uvesafb will not work without v86d. Now, we emerge v86d:

# emerge v86d

Back to kernel configuration

Reconfigure the kernel:

General Setup->
[*] Initial RAM filesystem and RAM disk (initramfs/initrd) support
(/usr/share/v86d/initramfs)    Initramfs source file(s)

Rebuild the kernel: make and install it, install the modules

Bootloader configuration

add video=uvesafb:1440x900-32,mtrr:3,ywrap (or similar) to your kernel command line, like in example boot.conf

boot {
        generate grub
        default "Funtoo Linux uvesafb" 
        timeout 3 
}
  "Funtoo Linux uvesafb" { 
        kernel bzImage-uvesafb[-v]
        params += video=uvesafb:1440x900-32,mtrr:3,ywrap
}

Then run:

# boot-update

and then run:

# reboot

and enjoy uvesafb!