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New: acpi-cpufreq cannot use lowest reported P-state

Bug 75661 [email protected] 1 participant 6 messages May 7, 2014 – Aug 11, 2014

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https://bugzilla.kernel.org/show_bug.cgi?id=75661

            Bug ID: 75661
           Summary: acpi-cpufreq cannot use lowest reported P-state
           Product: Power Management
           Version: 2.5
    Kernel Version: 3.14.2
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: cpufreq
          Assignee: [email protected]
          Reporter: [email protected]
        Regression: No

CPU: AMD A8-4500M
cpupower reports 900Mhz is lowest P-state frequency. However available frequency for governor only 1.4ghz - 1.9ghz.

****************************************************
[root@skittle-hp skittle]# cpupower frequency-info
analyzing CPU 0:
driver: acpi-cpufreq
CPUs which run at the same hardware frequency: 0
CPUs which need to have their frequency coordinated by software: 0 maximum transition latency: 4.0 us.
hardware limits: 1.40 GHz - 1.90 GHz
available frequency steps: 1.90 GHz, 1.80 GHz, 1.70 GHz, 1.60 GHz, 1.40 GHz available cpufreq governors: ondemand, performance
current policy: frequency should be within 1.40 GHz and 1.90 GHz.
The governor "ondemand" may decide which speed to use within this range.
current CPU frequency is 1.40 GHz (asserted by call to hardware). boost state support:

    Supported: yes
    Active: no
    Boost States: 2
    Total States: 8
    Pstate-Pb0: 2800MHz (boost state)
    Pstate-Pb1: 2300MHz (boost state)
    Pstate-P0:  1900MHz
    Pstate-P1:  1800MHz
    Pstate-P2:  1700MHz
    Pstate-P3:  1600MHz
    Pstate-P4:  1400MHz
    Pstate-P5:  900MHz

[root@skittle-hp skittle]# cat /proc/cpuinfo
processor : 0
vendor_id : AuthenticAMD
cpu family : 21
model : 16
model name : AMD A8-4500M APU with Radeon(tm) HD Graphics
stepping : 1
microcode : 0x6001119
cpu MHz : 1400.000
cache size : 2048 KB
physical id : 0
siblings : 4
core id : 0
cpu cores : 2
apicid : 16
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 13
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl nonstop_tsc extd_apicid aperfmperf pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 popcnt aes xsave avx f16c lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs xop skinit wdt lwp fma4 tce nodeid_msr tbm topoext perfctr_core perfctr_nb arat cpb hw_pstate npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold bmi1
bogomips : 3794.12
TLB size : 1536 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 48 bits physical, 48 bits virtual
power management: ts ttp tm 100mhzsteps hwpstate cpb eff_freq_ro

processor : 1
vendor_id : AuthenticAMD
cpu family : 21
model : 16
model name : AMD A8-4500M APU with Radeon(tm) HD Graphics
stepping : 1
microcode : 0x6001119
cpu MHz : 1400.000
cache size : 2048 KB
physical id : 0
siblings : 4
core id : 1
cpu cores : 2
apicid : 17
initial apicid : 1
fpu : yes
fpu_exception : yes
cpuid level : 13
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl nonstop_tsc extd_apicid aperfmperf pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 popcnt aes xsave avx f16c lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs xop skinit wdt lwp fma4 tce nodeid_msr tbm topoext perfctr_core perfctr_nb arat cpb hw_pstate npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold bmi1
bogomips : 3794.12
TLB size : 1536 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 48 bits physical, 48 bits virtual
power management: ts ttp tm 100mhzsteps hwpstate cpb eff_freq_ro

processor : 2
vendor_id : AuthenticAMD
cpu family : 21
model : 16
model name : AMD A8-4500M APU with Radeon(tm) HD Graphics
stepping : 1
microcode : 0x6001119
cpu MHz : 1400.000
cache size : 2048 KB
physical id : 0
siblings : 4
core id : 2
cpu cores : 2
apicid : 18
initial apicid : 2
fpu : yes
fpu_exception : yes
cpuid level : 13
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl nonstop_tsc extd_apicid aperfmperf pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 popcnt aes xsave avx f16c lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs xop skinit wdt lwp fma4 tce nodeid_msr tbm topoext perfctr_core perfctr_nb arat cpb hw_pstate npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold bmi1
bogomips : 3794.12
TLB size : 1536 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 48 bits physical, 48 bits virtual
power management: ts ttp tm 100mhzsteps hwpstate cpb eff_freq_ro

processor : 3
vendor_id : AuthenticAMD
cpu family : 21
model : 16
model name : AMD A8-4500M APU with Radeon(tm) HD Graphics
stepping : 1
microcode : 0x6001119
cpu MHz : 1400.000
cache size : 2048 KB
physical id : 0
siblings : 4
core id : 3
cpu cores : 2
apicid : 19
initial apicid : 3
fpu : yes
fpu_exception : yes
cpuid level : 13
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl nonstop_tsc extd_apicid aperfmperf pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 popcnt aes xsave avx f16c lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs xop skinit wdt lwp fma4 tce nodeid_msr tbm topoext perfctr_core perfctr_nb arat cpb hw_pstate npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold bmi1
bogomips : 3794.12
TLB size : 1536 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 48 bits physical, 48 bits virtual
power management: ts ttp tm 100mhzsteps hwpstate cpb eff_freq_ro

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author
#1 lore raw

[Bug 75661] acpi-cpufreq cannot use lowest reported P-state (A8-4500M)

https://bugzilla.kernel.org/show_bug.cgi?id=75661

Justin M <[email protected]> changed:

What |Removed |Added
----------------------------------------------------------------------------

            Summary|acpi-cpufreq cannot use     |acpi-cpufreq cannot use
                   |lowest reported P-state     |lowest reported P-state
                   |                            |(A8-4500M)
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#2 lore raw

[Bug 75661] acpi-cpufreq cannot use lowest reported P-state (A8-4500M)

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=75661

Zhang Rui <[email protected]> changed:

What |Removed |Added
----------------------------------------------------------------------------

             Status|NEW                         |NEEDINFO
                 CC|                            |[email protected]

--- Comment #1 from Zhang Rui <[email protected]> ---
please attach the output of "grep . /sys/devices/system/cpu/cpu0/cpufreq/*"

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#3 lore raw

[Bug 75661] acpi-cpufreq cannot use lowest reported P-state (A8-4500M)

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=75661

--- Comment #2 from Justin M <[email protected]> ---

# 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
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#4 lore raw

[Bug 75661] AMD A8-4500M: acpi-cpufreq cannot use lowest reported P-state

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=75661

Lan Tianyu <[email protected]> changed:

What |Removed |Added
----------------------------------------------------------------------------

                 CC|                            |[email protected]
            Summary|acpi-cpufreq cannot use     |AMD A8-4500M: acpi-cpufreq
                   |lowest reported P-state     |cannot use lowest reported
                   |(A8-4500M)                  |P-state
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author
#5 lore raw

[Bug 75661] AMD A8-4500M: acpi-cpufreq cannot use lowest reported P-state

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=75661

Zhang Rui <[email protected]> changed:

What |Removed |Added
----------------------------------------------------------------------------

             Status|NEEDINFO                    |CLOSED
         Resolution|---                         |INVALID
           Assignee|[email protected]     |[email protected]

--- Comment #3 from Zhang Rui <[email protected]> ---
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.

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