[Bug 349314] Re: Slow performance and tiling issues on i915

[Andy Whitcroft]

@pitti -- yes it does appear to be a large chunk of code.  However in
the main for this chipset the affected hardware should already have been
enabled by the BIOS.  It is not normal for this driver to run with that
part of the support disabled on the hardware which supports it.  The
code presented here to enable it should only trigger when the BIOS has
not already enabled it.  For the normal system it should be a noop.
Enabling this hardware correctly should bring the affected systems
closer to a normal configuration and in that sense to a more tested
position.

It also should be noted that the performance regression introduced by
the lack of this support is very severe (this component was enabled in
previous releases).  It is particularly severe on smaller systems such
as those in the netbook market which are effectively rendered useless
for video playback as well as being extremely sluggish in general use.

-- 
Slow performance and tiling issues on i915
https://bugs.launchpad.net/bugs/349314
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