Bug 75661
Summary: | AMD A8-4500M: acpi-cpufreq cannot use lowest reported P-state | ||
---|---|---|---|
Product: | Power Management | Reporter: | Justin M (runningskittle) |
Component: | cpufreq | Assignee: | Zhang Rui (rui.zhang) |
Status: | CLOSED INVALID | ||
Severity: | normal | CC: | rui.zhang, tianyu.lan |
Priority: | P1 | ||
Hardware: | x86-64 | ||
OS: | Linux | ||
Kernel Version: | 3.14.2 | Subsystem: | |
Regression: | No | Bisected commit-id: |
Description
Justin M
2014-05-07 16:15:54 UTC
please attach the output of "grep . /sys/devices/system/cpu/cpu0/cpufreq/*" # grep . /sys/devices/system/cpu/cpu0/cpufreq/* /sys/devices/system/cpu/cpu0/cpufreq/affected_cpus:0 /sys/devices/system/cpu/cpu0/cpufreq/bios_limit:1900000 /sys/devices/system/cpu/cpu0/cpufreq/cpb:1 /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq:1900000 /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq:1900000 /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq:1400000 /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_transition_latency:4000 /sys/devices/system/cpu/cpu0/cpufreq/freqdomain_cpus:0 1 /sys/devices/system/cpu/cpu0/cpufreq/related_cpus:0 /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies:1900000 1800000 1700000 1600000 1400000 /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors:ondemand performance /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq:1900000 /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver:acpi-cpufreq /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor:performance /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq:1900000 /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq:1400000 /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed:<unsupported> **** Unfortunately I have been unable to find actual documentation that says whether the CPU actually supports 900MHz p-state From the log, we can see that BIOS does not tell OS that 900MHZ is available. maybe you can re-check after booting with AC unplugged, but anyway, I will close this as it is not a kernel issue. |