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What is framebuffer support?
The framebuffer (fbdev) is a character device providing access to graphics hardware. The Vybrid kernel 4.1 and older come with a fbdev driver called dcu. Kernels 4.4 and newer come with a DRM driver which supports the fbdev interface via fbdev emulation.
What is fbdev driver?
fbdev is an Xorg driver for framebuffer devices. This is a non-accelerated driver, the following framebuffer depths are supported: 8, 15, 16, 24. All visual types are supported for depth 8, and TrueColor visual is supported for the other depths. Multi-head configurations are supported.
What is the function of a framebuffer console?
The framebuffer console (fbcon), as its name implies, is a text console running on top of the framebuffer device. It has the functionality of any standard text console driver, such as the VGA console, with the added features that can be attributed to the graphical nature of the framebuffer.
Can a virtual terminal be used as a framebuffer?
Several people have answered the parts of your question dealing with the kernel and putting images (rather than text) onto the framebuffer, but so far the rest remains unaddressed. Yes, you can use the kernel virtual terminal subsystem to make a so-called framebuffer console.
Why does the framebuffer remain at its normal orientation?
Any other applications that use the framebuffer will remain at their ‘normal’ orientation. Actually, the underlying fb driver is totally ignorant of console rotation. This option specifies the color of the margins. The margins are the leftover area at the right and the bottom of the screen that are not used by text.
How to use fb0 as a console from userspace?
The console-terminal-emulator and console-fb-realizer tools in nosh — a userspace virtual terminal aimed at replicating Linux and FreeBSD/PC-BSD kernel virtual terminals. It too has no dependencies on X libraries. kmscon — a userspace virtual terminal that is closely linked to the logind server in systemd and its notions of “seats”.