Re: Xen Kernel NVidia and power save

["Jarod Wilson" <user=74@nabble.blu.org>]

 On Wed, 2008-08-20 at 14:55 -0400, Jerry Feldman wrote: 
> I found that the nvidia supplied driver would not work in a xen enabled 
> kernel, but it does install in the non-xen enabled version of the same 
> kernel. I was just wondering if anyone had the same experience. At this 
> point, it is not very important, more curiosity. 

I believe its a known issue. 

> Second, I was having problems getting power save to work properly. After 
> playing with the nvidia driver, I booted into the non-xen enabled 
> kernel, and now power save is working. So, I was wondering if there is 
> something in the xen-enabled kernel that prevents power save from 
> working. I have not booted back into the xen kernel to make sure it 
> works or not. Ideally, the virtual machine software, whether the xen 
> hypervisor or VMWare or Virtualbox should handle power management, so 
> this is simply an RTFM question that I'll figure out next week after the 
> installfest when I may have some time. 

One of the huge problems with the xen hypervisor is that it attempts to 
entirely reinvent the wheel -- which includes proper support for cpu 
frequecy scaling and acpi in general. 

In Red Hat Enterprise Linux 5.2's kernel-xen, there's rudimentary freq 
scaling support for certain cpus. 



-- 
Jarod Wilson 
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