I have a RaspberryPi and want to display an image fullscreen without xserver – so write it directly to the framebuffer. No problem here.
But setting it fullscreen doesn’t work.
cat /sys/class/graphics/fb0/modes
yields:
U:1024x768p-0 U:1920x1200p-0 U:1920x1080p-0 U:608x684p-0
So I use
fbset -xres 1920 -yres 1200 -match
resulting in
>>fbset mode "1920x1200" geometry 1920 1200 1920 1200 16 timings 0 0 0 0 0 0 0 rgba 5/11,6/5,5/0,0/16 endmode
If I now use fbi to display an image, or just fill the framebuffer /dev/urandom >> /dev/fb0, just part of the screen is filled. The aspect etc. of the displayed part is correct, there is just a big black boundary around.
If I use other resolutions, everything works as expected, for example the stats-line in fbi gets bigger etc.
What do I do wrong?
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Answer
Try this format for fbset:
fbset -fb /dev/fb0 -g 1920 1200 1920 1200 16
And check you’re really looking at fb0 and not fb1:
fbset -fb /dev/fb0
Double check what was actually set:
cat /sys/class/graphics/fb0/mode
Also try to run fbi with (again, to make sure you’re using fb0):
fbi -d /dev/fb0 image.png
You could also force your settings into the fb0 by doing:
echo U:1920x1200p-0 > /sys/class/graphics/fb0/mode
Technically, that is what fbset is doing anyway. Just making sure fb1 isn’t screwing things up.
Last, make sure your console is using fb0. I’m sure it is.
con2fbmap 1
You may also want to reboot, so check what your setting is:
cat /proc/cmdline
If its not 1920×1200, update to 1920×200. I think it located in /boot/cmdline.txt for raspberry pi. For me its /boot/uEnv.txt.