> x86-64 cannot call the 32bit VESA BIOS. This means when vesafb is active
> it does software copying in the vesa frame buffer. This is insanely slow
> when the frame buffer is not marked for write combining.
> Some discussion showed that the use_mtrr flag was only off for some
> old broken ET4000 ISA card. x86-64 has no ISA, so this is no concern.
> Make the default depend on CONFIG_ISA.
There are PCI ET4000's too. Though if we can get the PCI IDs for those,
we can work around them with a quirk. I have one *somewhere*, but it'll
take me a while to dig it out.
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