[Bug 218686] Fail to set energy_performance_preference of amd processor on asus ga403uv

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=218686

xiaojian.du@amd.com changed:

           What    |Removed                     |Added
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                 CC|                            |xiaojian.du@amd.com

--- Comment #28 from xiaojian.du@amd.com ---
confirmed from another Phoenix 7840HS platform:
CPPC flag is exposed by BIOS.
So, on your 8945H CPU platform, it is very possible that ASUS doesn't enable
the CPPC in the BIOS.
I see this BIOS is built at 02/15/2024
"DMI: ASUSTeK COMPUTER INC. ROG Zephyrus G14 GA403UV_GA403UV/GA403UV, BIOS
GA403UV.303 02/15/2024"

~$ cat /proc/cpuinfo | grep cppc
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 amd_lbr_v2 nopl nonstop_tsc cpuid extd_apicid
aperfmperf rapl pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 x2apic movbe
popcnt aes xsave avx f16c rdrand lahf_lm cmp_legacy svm extapic cr8_legacy abm
sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt tce topoext perfctr_core
perfctr_nb bpext perfctr_llc mwaitx cpb cat_l3 cdp_l3 hw_pstate ssbd mba
perfmon_v2 ibrs ibpb stibp ibrs_enhanced vmmcall fsgsbase bmi1 avx2 smep bmi2
erms invpcid cqm rdt_a avx512f avx512dq rdseed adx smap avx512ifma clflushopt
clwb avx512cd sha_ni avx512bw avx512vl xsaveopt xsavec xgetbv1 xsaves cqm_llc
cqm_occup_llc cqm_mbm_total cqm_mbm_local avx512_bf16 clzero irperf xsaveerptr
rdpru wbnoinvd **cppc** arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean
flushbyasid decodeassists pausefilter pfthreshold v_vmsave_vmload vgif x2avic
v_spec_ctrl vnmi avx512vbmi umip pku ospke avx512_vbmi2 gfni vaes vpclmulqdq
avx512_vnni avx512_bitalg avx512_vpopcntdq rdpid overflow_recov succor smca
fsrm flush_l1d


BTW, suppose you're using a test kernel 6.9-rc built by yourslef,, need to
check kernel building config file to enable msr support:
make menucofnig  -> Processor type and features -> <M>/dev/cpu/*/msr -
Model-specific register support, change <M> to <*>

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