From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ben Widawsky <ben@bwidawsk.net>
Subject: Re: frame buffer compression and 915GM
Date: Fri, 27 May 2011 12:48:36 -0700
Message-ID: <20110527194836.GA23189@lundgren.kumite>
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To: SD <sd.domrep@yahoo.com>
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On Fri, May 27, 2011 at 01:51:53AM -0700, SD wrote:
> OK, thank you. I checked it, and I got unexpected answer -
> 
> FBC unsupported on this chipset.

I'd need to know exactly which chipset you have. For example. Ironlake
mobile, we disabled FBC because it was actually consuming more power.

You can check your specific chipset, and look at the has_fbc field here:
drivers/gpu/drm/i915/i915_drv.c

Ben