[ltp] C3 and USB

[Daniel Skorka]

On Tue, Oct 24, 2006 at 09:05:05PM +0200, Joerg Platte wrote:
> Hi,
> 
> with kernel 2.6.19-rc3 Linux is now able to switch to C3 power state when USB 
> modules are loaded. On my T40p this seems to work, but only when switching to 
> text console. When switching back to X, C2 is the only power state used by 
> the kernel. Does X prevent lower power states than C2? 

I have noticed that the synaptics driver causes the same problems on my
T43, though only when the touchpad is actually being used:
- run on batteries, unload USB modules -> no noise
- bring your fingers close to the touchpad -> cue high pitched noise

Daniel