From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 82958481B1 for ; Sun, 26 Jul 2026 13:14:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785071690; cv=none; b=TTeS2HSS6CH5V/IeS7Nm8+b+L6pTw3J58mZRsNR7sXhzS8HSfqDUDlIoE9pAnCnK97NMF6lc4iVbcx6ElmRIeMUva8oKrn1OraWDYpUcARsJmsmOjN/vdPunyKKAAM30iMVPGWTbUEGudsKKE9/B1bGMmnMfZ5dOCJtfLPKaWSQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785071690; c=relaxed/simple; bh=FNxUWAsXKxStVD/cnCs1pCDJa4rlUnj+iMPiU2D1tDI=; h=From:To:Subject:Date:Message-ID:Content-Type:MIME-Version; b=ib4g3RjuXJWip6IOIr2SWFQ83QSf9k6B6gF8jglj60aNb3ja0sQiUgSuDcVrKXx6yi0XDid8eEXp40m6Ppjf/eAVDYqvamAQBkcurNynhQS/zKMFh2w1IuvRqD3UgdmyhhgBr76vzl2S/xjofIQkWjedJqz6ODwsdtjOBuUwz5I= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=YFScX87m; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="YFScX87m" Received: by smtp.kernel.org (Postfix) with ESMTPS id EFB70C2BCB3 for ; Sun, 26 Jul 2026 13:14:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1785071690; bh=FNxUWAsXKxStVD/cnCs1pCDJa4rlUnj+iMPiU2D1tDI=; h=From:To:Subject:Date:From; b=YFScX87mmO1cSe1bhv96EBtbJbyVJQMWHJyskii4O+60vnHY9xMgYoocpq6iv0HoQ 1Xb3Ctj6orykCwyS5Vmp1PwU47oJXd4FY2uRcnziHVI670zvUkdVcmQoRorP/nYUt2 fAayY9uiGxu9CQXk4KTFFdcCFxqqzkPJjfaltKKmnZAuxPDhk6vEYiQimx2tra7mRi 9ejWRFGw0C/ElSrO+p32YBR/gBJ3BJZYG9vpf2zv1MjSvcq++dRt8nc6+i7FDagyC0 vA5EaXhmMaQ4l1yGLxvcHE9KYXGJpXknAfAyOhVQyTB+FMzehIaTKI9YeqJH+Ze/Ep BrU6fJBw61/+Q== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id C351EC4160E; Sun, 26 Jul 2026 13:14:49 +0000 (UTC) From: bugzilla-daemon@kernel.org To: platform-driver-x86@vger.kernel.org Subject: [Bug 221796] New: intel_pmc_core: Arrow Lake-HX (Core Ultra 9 275HX) uses ARL-H DMU GUID and fails to expose Die C6 telemetry / existing Date: Sun, 26 Jul 2026 13:14:49 +0000 X-Bugzilla-Reason: None X-Bugzilla-Type: new X-Bugzilla-Watch-Reason: AssignedTo drivers_platform_x86@kernel-bugs.osdl.org X-Bugzilla-Product: Drivers X-Bugzilla-Component: Platform_x86 X-Bugzilla-Version: 2.5 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: marek.suranic@gmail.com X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: drivers_platform_x86@kernel-bugs.osdl.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: bug_id short_desc product version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter cf_regression Message-ID: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugzilla.kernel.org/ Auto-Submitted: auto-generated Precedence: bulk X-Mailing-List: platform-driver-x86@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 https://bugzilla.kernel.org/show_bug.cgi?id=3D221796 Bug ID: 221796 Summary: intel_pmc_core: Arrow Lake-HX (Core Ultra 9 275HX) uses ARL-H DMU GUID and fails to expose Die C6 telemetry / existing Product: Drivers Version: 2.5 Hardware: Intel OS: Linux Status: NEW Severity: normal Priority: P3 Component: Platform_x86 Assignee: drivers_platform_x86@kernel-bugs.osdl.org Reporter: marek.suranic@gmail.com Regression: No HARDWARE / SYSTEM =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D Laptop: MSI Vector 16 HX AI A2XW CPU: Intel Core Ultra 9 275HX CPU family: 6 CPU model: 198 (0xc6) CPU stepping: 2 CPU topology: 24 cores, 1 thread per core Operating system: Fedora Linux 44 Kernel: 7.1.4-204.fc44.x86_64 Architecture: x86_64 Preemption model: PREEMPT_DYNAMIC PROBLEM =3D=3D=3D=3D=3D=3D=3D With the unmodified intel_pmc_core module, the kernel reports: intel_pmc_core INT33A1:00: pmc_core: couldn't get DMU telem endpoint -19 intel_pmc_core INT33A1:00: initialized The driver otherwise initializes, but the following debugfs entry is missing: /sys/kernel/debug/pmc_core/die_c6_us_show RELEVANT INTEL PMT ENDPOINT =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D= =3D=3D The platform exposes the following telemetry endpoint: /sys/class/intel_pmt/telem4/guid: 0x1a06a101 /sys/class/intel_pmt/telem4/size: 136 /sys/class/intel_pmt/telem4/offset: 0 The available GUID 0x1a06a101 corresponds to ARL_H_PMT_DMU_GUID. The Core Ultra 9 275HX has CPU model 0xc6 and is selected through the generic Arrow Lake configuration. The generic ARL_PMT_DMU_GUIDS list only checks ARL_PMT_DMU_GUID (0x1a06a102), so the available 0x1a06a101 endpoint is not found. TESTED PATCH =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D -static u32 ARL_PMT_DMU_GUIDS[] =3D - {ARL_PMT_DMU_GUID, 0x0}; +static u32 ARL_PMT_DMU_GUIDS[] =3D + {ARL_PMT_DMU_GUID, ARL_H_PMT_DMU_GUID, 0x0}; RESULT =3D=3D=3D=3D=3D=3D After rebuilding and signing intel_pmc_core against kernel 7.1.4-204.fc44.x86_64: - The "couldn't get DMU telem endpoint -19" message disappeared. - intel_pmc_core initialized successfully. - /sys/kernel/debug/pmc_core/die_c6_us_show became available. - The Die C6 telemetry value became readable. Command and output: $ sudo cat /sys/kernel/debug/pmc_core/die_c6_us_show 31917705 Relevant kernel log after applying the patch: intel_pmc_core: loading out-of-tree module taints kernel. intel_pmc_core INT33A1:00: initialized The out-of-tree taint is expected because the patched module was built and installed separately for testing. CONCLUSION =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D This suggests that Arrow Lake-HX model 0xc6 systems may need ARL_H_PMT_DMU_GUID as a fallback in ARL_PMT_DMU_GUIDS. --=20 You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.=