Uvesafb
In contrast with other framebuffer drivers, uvesafb needs a userspace virtualizing daemon, called v86d. It may seem foolish to emulate x86 code on a x86, but this is important if one wants to use the framebuffer code on other architectures (notably non-x86 ones). It was added in kernel 2.6.24 and has many more features than the standard vesafb, including:
- Proper blanking and hardware suspension after delay
- Support for custom resolutions as in the system BIOS.
It should support as much hardware as vesafb.
Installation
Install the uvesafb-dkmsAUR package.
Configuration
Remove any framebuffer-related kernel boot parameter from the bootloader configuration to disable the old vesafb framebuffer from loading.
$ grep vga /proc/cmdline $ grep -ir vga /etc/modprobe.d/
Should return no results. If you do have a vga= option somewhere, you will need to remove it.
GRUB
First edit /etc/default/grub Comment the GRUB_GFXPAYLOAD_LINUX=keep line in /etc/default/grub, and re-generate its main configuration file.
GRUB legacy
Remove all references to from kernel lines in to allow correct operation of uvesafb.
mkinitcpio hook
Add the v86d hook to HOOKS in . This allows uvesafb to take over at boot time.
HOOKS="base udev v86d ..."
Define a resolution
The settings for uvesafb are defined in .
Documentation for mode_option can be found at .
To prevent your customizations being overwritten when the package is updated, copy this file to :
# cp /usr/lib/modprobe.d/uvesafb.conf /etc/modprobe.d/uvesafb.conf
and then add an entry in the FILES section of pointing to your configuration file, like so:
FILES="/etc/modprobe.d/uvesafb.conf"
To make changes take effect, regenerate the initramfs and reboot the system.
Optimizing Resolution
A list of possible resolutions can be generated via the following command:
$ cat /sys/bus/platform/drivers/uvesafb/uvesafb.0/vbe_modes
Users can then modify with any entry returned above.
Checking Current Resolution
Either of following commands can be used to show the current framebuffer resolution as a sanity check to see that settings are honored:
$ cat /sys/devices/virtual/graphics/fbcon/subsystem/fb0/virtual_size
$ cat /sys/class/graphics/fb0/virtual_size
Kernel module parameters
If you compile your own kernel then you can also compile uvesafb into the kernel and run v86d later. In this case, the options can be passed as kernel parameters in the format video=uvesafb:options.
Troubleshooting
Uvesafb cannot reserve memory
Check if you forgot to remove any vga= kernel parameter − this overrides the UVESA framebuffer with a standard VESA one.
Try to add to the kernel command line.