Hi,
On Tue, Dec 27, 2005 at 03:22:38PM +0100, Pavel Machek wrote:
> So... I guess I found out what is going on.
>
> When power is unplugged, X32 adds C4 state. When power is plugged, X32
> removes C4 state (behaviour Ted seen). When I load ipw2200, this
> behaviour stops, and I see everything up-to C4. Strange. I remember
> ipw had some problems with C3 and C4, perhaps this is related?
Nothing strange at all. The C-States are exported by the BIOS to the OS
using the _CST method/object/whatever. This can change on runtime. When the
BIOS recognizes it is on battery power, the _CST contains the C4 state, if
it is on AC power, the _CST doesn't contain it. The ACPI code follows what
it is told by the BIOS, for it has no chance to know about this additional
C-State if on AC power, and it wouldn't be wise to second-guess the BIOS.
Ipw does limit the max_cstate setting dynamically if it recognizes problems;
however I haven't seen _any_ such things lately on my own system. Might be
related to dyntick being _enabled_, though ;-)
Dominik
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
