From: bugzilla-daemon@kernel.org
To: linux-pm@vger.kernel.org
Subject: [Bug 218686] Fail to set energy_performance_preference of amd processor on asus ga403uv
Date: Thu, 01 Aug 2024 03:39:33 +0000 [thread overview]
Message-ID: <bug-218686-137361-FjMHkm5myT@https.bugzilla.kernel.org/> (raw)
In-Reply-To: <bug-218686-137361@https.bugzilla.kernel.org/>
https://bugzilla.kernel.org/show_bug.cgi?id=218686
--- Comment #67 from Perry Yuan(AMD) (Perry.Yuan@amd.com) ---
https://www.amd.com/content/dam/amd/en/documents/processor-tech-docs/programmer-references/55901_B1_pub_053.zip
Page 120.
CPUID_Fn80000008_EBX [Extended Feature Extensions ID EBX]
Bit 27 CPPC. Read-only. Reset: 1. Collaborative Processor Performance Control.
sudo cpuid -l 0x80000008 -r
CPU 0:
0x80000008 0x00: eax=0x00003030 ebx=0x111ef257 ecx=0x0000400f edx=0x00010000
Bit 27 = 0, that means BIOS didn`t enable CPPC capability, OS cannot detect the
CPPC flag on the system,
you can check lscpu output,
#lscpu |grep cppc.
Windows maybe don`t depends on this CPUID bit, but Linux detect the CPUID and
set cppc flag at kernel booting. no cppc flag, amd-pstate driver cannot load so
far.
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2024-04-06 2:56 [Bug 218686] New: Fail to set energy_performance_preference of amd processor on asus ga403uv bugzilla-daemon
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