[Bug 37394] [Arrandale] Poor power management if an external display was previously connected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=37394

--- Comment #26 from Ouping Zhang <ouping.zhang at intel.com> ---
with the following environment, 
Kernel_version: 3.1.0-7.fc16.i686.PAE
Libdrm: (master)libdrm-2.4.40-1-g7d42b49c0cf19dbb4531cd84efae51f95db2eea1
Mesa: (master)1665af3066f3d58c42e9d5b13098f13615a7672c
Xserver:
(master)xorg-server-1.13.0-143-g6a6c3afe71ac82a93d9fd0034dd5bbdcf0eae1ea
Xf86_video_intel: (master)2.20.13-9-g866ed4a26cbbb29ef3845b0aa56383c4d951c65a
Cairo: (master)62b795fe52c73ad58101c101aa77449f4b61a576
Libva: (staging)38c94cd922473095814ed9a9f99ad98fcc9c285d
Libva_intel_driver: (staging)e30019e8b90e67fb7599c27b94c30ae644f2ff07
Kernel_unstable: (drm-intel-nightly)628302221814f3c00858b5fcbc11df8f0c6f60d2

this issue can be reproduced again, 
Start X : 11.9 w
connect VGA: 13.3 w
xrandr --output VGA1 off: 12.5 w

disconnect VGA, the power usage falls down but never falls to the level of
boot. 

(In reply to comment #25)
> (In reply to comment #24)
> with the latest Kernel and Mesa, the bug has
> been fixed on SNB and IVB.
> (In reply to comment #23)

I don't know, I'm
> still seeing about 1W difference on SNB (which I think is better than it
> used to be -- thanks for your efforts, guys -- but I wouldn't call it fully
> resolved).

Ouping, what kernel version/Mesa do I need?  I'm running:
> kernel 3.6.6
xorg-server 1.12.4
xf86-video-intel 2.20.12
mesa 8.0.4
libdrm
> 2.4.37

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