Re: [Xen-devel] VGA console low power mode in Xen

[Stefano Stabellini <stefano.stabellini@xxxxxxxxxxxxx>]

On Wed, 24 Nov 2010, Carsten Schiers wrote:
> Hi,
> 
> I am a bit lost, because after exchanging my PCI console VGA (oldtimer) 
> with aprox 7-9W with a
> new Radeon 5450, which will draw less than 7W theoretically in 2D mode, 
> I have 15W more on the 
> meter.
> 
> In "normal" kernels, I guess I have to enable radeonfb in old versions 
> and KMS in newer. 
> 
> I currently use Xen 4.0.1 with 2.6.18 Kernel. 2.6.34.7 forward patched 
> is theoretically available.
> 
> Is my assumptions right that the card is not in low power mode and what 
> would you recommend to
> set on Xen and/or Kernel in order to get the promised 7W. I need the PCI 
> slot for something else.
> 
> I only need console and prefer VGA over serial, because of BIOS settings 
> etc.
> 

It seems like you need to upgrade your dom0 kernel, give a look at this
wiki page:

http://wiki.xen.org/xenwiki/XenDom0Kernels

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