Re: [PATCH] Use MTRRs by default for vesafb on x86-64

[Dave Jones]

On Thu, May 15, 2003 at 04:56:40PM +0200, Andi Kleen wrote:

 > 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.

		Dave