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SubjectRe: Huge console switching lags

> Well, there are indeed a few improvements to get with machine specific
> optimisations on unaccelerated framebuffer.

Neat trick. Please note also that no read operations to the framebuffer
are done by the fbcon layer. Such reads should be to the shadow buffers
(vc_screenbuffer) instead. Reading the framebuffer is a userland operation
and as such you really only tricks for reading in userland.

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