2.6.15-rc5-mm1
Quoted 7 lines · On 2005-12-06 15:12:28 Matthew Garrett wrote:
Quoted 3 lines · Roman I Khimov
*C1: type[C1] promotion[--] demotion[--]
latency[000] usage[00000000]Yup, that looks like the problem. I've no idea what changed in this area, but without C2 state support heat output will be higher.
Observe that C1 claims to be unused as well. I just compiled the 2.6.15-rc5 proper and have lost my one and only C-state:
root@sleipner:~# diff -Nur dmesg-2.6.14 dmesg-2.6.15-rc5 |grep "power " -ACPI: CPU0 (power states: C1[C1])
root@sleipner:~# cat /proc/acpi/processor/CPU0/power active state: C1 max_cstate: C8 bus master activity: 00000000 states: *C1: type[C1] promotion[--] demotion[--] latency[000] usage[00000000]
The usage field really does get used in 2.6.14 while staying zero in 15-rc5. I suspect this is the culprit (and no, I haven't tried the nocst boot param):
--quote--
commit 6d93c64803a5fea84839789aae13290419c62d92
Author: Venkatesh Pallipadi <[email protected]> Date: Thu Sep 15 12:19:00 2005 -0400
[ACPI] Prefer _CST over FADT for C-state capabilities
Note: This ACPI standard compliance may cause regression on some system, if they have _CST present, but _CST value is bogus. "nocst" module parameter should workaround that regression.
http://bugzilla.kernel.org/show_bug.cgi?id=5165
(cherry picked from 883baf7f7e81cca26f4683ae0d25ba48f094cc08 commit)
--unquote--
Mvh
Mats Johannesson
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