So... I got fbset working, can change resolution at run-time.

Luridis · 04-17-2014, 12:03 AM

I had to do a lot of hacking on the Makefile and patches, but I did get this working. I can now set the KMS-framebuffer console resolution after boot, even if there was an initial GRUB framebuffer module. This is really useful with VMWare and being able to step down from full screen. I can even adjust the virtual frame buffer size. But, some of the functions keel over, timings mainly. That wouldn't effect VMWare, but would affect a laptop.

Code:

root [ ~ ]# fbset -xres 800 -yres 600 -match
root [ ~ ]# fbset

mode "800x600"
    geometry 800 600 2048 600 32
    timings 0 0 0 0 0 0 0
    rgba 8/16,8/8,8/0,0/0
endmode

root [ ~ ]# fbset -xres 1024 -yres 768 -match
root [ ~ ]# fbset

mode "1024x768"
    geometry 1024 768 2048 768 32
    timings 0 0 0 0 0 0 0
    rgba 8/16,8/8,8/0,0/0
endmode

root [ ~ ]# fbset -xres 1920 -yres 1080 -match
root [ ~ ]# fbset

mode "1920x1080"
    geometry 1920 1080 2048 1080 32
    timings 0 0 0 0 0 0 0
    rgba 8/16,8/8,8/0,0/0
endmode

root [ ~ ]# fbset -xres 1152 -yres 864 -match
root [ ~ ]# fbset

mode "1152x864"
    geometry 1152 864 2048 864 32
    timings 0 0 0 0 0 0 0
    rgba 8/16,8/8,8/0,0/0
endmode

root [ ~ ]#

The ultimate goal here is to setup two FBCons on the same framebuffer and have a split screen with two shells, not using a GUI. Tmux and Byobu will probably help out there. But, I'm just extatic that I don't have to reboot to change the screen now.

EDIT: Scratch that, the purpose to to be able to switch in VMWare from a 1024x768 window with 1 console to full screen 1080P with two consoles.

magiblot · 07-14-2018, 09:40 AM

Please excuse me for reviving this old thread.

Quote:

Originally Posted by Luridis

I had to do a lot of hacking on the Makefile and patches, but I did get this working. I can now set the KMS-framebuffer console resolution after boot, even if there was an initial GRUB framebuffer module.

I'm very interested in this. Could you please share your fix for fbset?

Lots of thanks.

Luridis · 07-16-2018, 01:05 PM

I haven't used this for a while, but you can look at the ArchLinux package build and see if it works for you.

https://git.archlinux.org/svntogit/c...packages/fbset

magiblot · 07-16-2018, 05:33 PM

Hi Luridis! Thanks for the reply.

I already tried the Arch Linux release, since it's the distribution I use, but it didn't work for me. With the -g or -xres -yres options, the active part of the framebuffer appears confined to the top-left corner instead of becoming fullscreen. Modelines from fb.modes are not accepted. My framebuffer driver is inteldrmfb.

The Ubuntu and Debian packages seem to come with additional patches, but they don't work either.

Cheers.