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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.
[snip]...

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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