This opens the framebuffer upon registration so we can use it for
drawing-operations. On unregistration we close it again.
While opening/closing or accessing the fb in any other way, we must hold
the fb-mutex. However, since the notifiers are often called with the mutex
already held, we cannot
This opens the framebuffer upon registration so we can use it for
drawing-operations. On unregistration we close it again.
While opening/closing or accessing the fb in any other way, we must hold
the fb-mutex. However, since the notifiers are often called with the mutex
already held, we cannot
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