I have seen this config flag CONFIG_FB_VIRTUAL=y
- What does it do?
- How does it work?
- What is the relation between
vfbandxvfb?
I have seen this config flag CONFIG_FB_VIRTUAL=y What does it do? How does it
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I have seen this config flag CONFIG_FB_VIRTUAL=y
vfb and xvfb?
According to this page, it’s for testing. It’s a framebuffer that’s in main memory instead of graphics memory, so you basically can’t see it, but if your app environment needs a framebuffer for whatever reason and your hardware doesn’t have graphics (not uncommon in embedded apps) then it can be useful.
xvfb is a very different beast. It creates its own virtual framebuffer in userspace for use as an X display. It can be used with programs that need an X connection (e.g. older versions of PhantomJS) but for some reason the system doesn’t have an existing X display. It doesn’t need any kind of support from the kernel to do this – it uses a framebuffer, but really a framebuffer is just a fancy term for a chunk of memory used for a graphical screen.