Hi all,
I used to change my CPU speed via sysctl:
sysctl dev.cpu.0.freq=1650
I did that because that helped me to decrease the CPU temperature, and such
speed was enough. This way went well and I did that after logging into the
system via ssh. (I have some troubles with `powerd` so I have to use `sysctl`
manually.)
Yesterday, because `sysctl` often required root permission, I wrote a small
script that could help to to change cpu speed via ssh
./my_script.sh 1650
=> ssh t...@localhost sysctl dev.cpu.0.freq=1650
(my password goes here)
Then I suddenly found that the system was very very slow after the above call,
though I ran nothing (except for bash, top). Being afraid that something went
wrong, I just moved to the maximum speed:
ssh t...@localhost sysctl dev.cpu.0.freq=2200
but this couldn't help. (Using `dmesg` I saw a line "Device wasn't configured")
Now I can't change my cpu speed anymore: If I switch from 2200 to 1925 (the
next lower value), the system would be slowed down and I can't do anything
(because it is very very slow). The only way is to reboot. And here is another
strange thing: after the FreeBSD sends the last message of its reboot process,
the system halts with black-blank screen; then I have to unplug the power
supply (an external adapter), unplug the battery, wait for some seconds, plug
the battery / power supply before turning the system on.
I am using FreeBSD 8.0 (RELEASE) on a laptop with a custom kernel
http://viettug.org/attachments/download/349/icy_kernel_20100119.txt
The full output of my `sysctl dev.cpu.`
/=================================================================================
dev.cpu.0.%desc: ACPI CPU
dev.cpu.0.%driver: cpu
dev.cpu.0.%location: handle=\_PR_.CPU0
dev.cpu.0.%pnpinfo: _HID=none _UID=0
dev.cpu.0.%parent: acpi0
dev.cpu.0.freq: 2200
dev.cpu.0.freq_levels: 2200/15975 1925/13978 1650/11981 1375/9984 1100/5795
962/5070 825/4346 687/3621 550/2320 481/2030 412/1740
343/1450 275/1160 206/870 137/580 68/290
dev.cpu.0.cx_supported: C1/0
dev.cpu.0.cx_lowest: C1
dev.cpu.0.cx_usage: 100.00% last 500us
dev.cpu.1.%desc: ACPI CPU
dev.cpu.1.%driver: cpu
dev.cpu.1.%location: handle=\_PR_.CPU1
dev.cpu.1.%pnpinfo: _HID=none _UID=0
dev.cpu.1.%parent: acpi0
dev.cpu.1.cx_supported: C1/0
dev.cpu.1.cx_lowest: C1
dev.cpu.1.cx_usage: 100.00% last 500us
\=================================================================================
I doubt that there was something failed with my hardware :( Quite disappointed
'til now.
Could you give me advice?
Thank you for your helps,
Regards,
--
Anh Ky Huynh
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