[ltp] Re: no C3 state in X - but i do get to C3 with X running but not displayed on screen

[Brad Langhorst]

On Wed, 2005-04-06 at 17:24 -0600, Jeff Lessem wrote:
> Uwe Walter <walter-l@tm.uka.de> writes:
> 
> > Indeed, I can observe the same behaviour: My T42p CPU does fall into C3
> > if uhci_hci is loaded and no external USB (1.1) device is attached.
> 
> Not to hijack the thread, 
uh... this does hijact the thread
> but I have the opposite problem.  I would
> like to selectively prevent my laptop, a T43, from entering C3 or C4.
> Currently, running 2.6.11.5 with the stock acpi + ibm-acpi-0.11, the
> laptop will happily enter C3 and C4 when running X (x.org opensource
> radeon driver) with the uhci_hcd and such loaded.
> 
> The problem is that the clock in vmware (running a Windows XP guest)
> runs extremely slowly when the processor enters C3 or C4 (this is the
> current theory).  CPU Mhz doesn't effect this, rather the C-state.  I
> would like to be able to do something to lock the processor into C1 or
> C2, so that vmware is useful.  Currently I run some hi-cpu usage
> program at nice +20 when I use vmware, and then the clock in the guest
> runs correctly.
> 
> I tried "plugging in" the internal bluetooth device, which uses USB
> 1.1 and is attached to the uhci port, but the laptop still goes into
> C3 and C4.  I then tried running hcitool scan, to actually use the
> bluetooth radio, and the laptop will still enter C3 or C4 while
> running the scan.

this is a known problem with vmware...
put this in your /etc/vmware/config

host.cpukHz = 1600000 (or whatever your speed is)
hostinfo.noTSC = TRUE
tools.syncTime = TRUE