Framebuffers with deferred I/O need to be flushed to the screen
explicitly, since we use neither the mmap nor the file I/O abstractions
that handle this for userspace FB clients.
Example: xenfb
Some framebuffer drivers implement lazy access to the screen without
actually exposing a fbdefio
Framebuffers with deferred I/O need to be flushed to the screen
explicitly, since we use neither the mmap nor the file I/O abstractions
that handle this for userspace FB clients.
Example: xenfb
Some framebuffer drivers implement lazy access to the screen without
actually exposing a fbdefio
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