From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=pass header.oldest-pass=0 smtp.remote-ip=209.85.214.177 ARC-Seal: i=2; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=pass; t=1793627923; b=pzGYiBs7histAcUS3gSo+fk14cPykXj85Y7hpjq5rQA4F5rJ3De1Pzud4WhYYN+ztApc /953hQqw3H4Zx5mRUPHylrXkJhD4JwBwXmmd8HpM1rsR3VS9X/536UpqmcwIApHuw817Z hWPadaOQ11bhfeGOaVi+C/dEzGJeQ/Mj4aA3CIwIB0hZfTUY3SZwn8/ZfQvjw/viki+bI jyzLTDuh4QeDCr1CS7LRMEDhDSblJpEUSLMcuHAGRtRdMSUAdIdnEle7TNcgk4lJbn+8P oJ6njvlbf72Qg5dLCFFHQnyN3/zVYvFMWVI9JH2Mjp85R1u177zj/XJPq5ilfuaqFWw== ARC-Message-Signature: i=2; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793627923; h=DMARC-Filter:Received:DKIM-Signature:X-Google-DKIM-Signature: X-Forwarded-Encrypted:X-Gm-Message-State:X-Gm-Gg:X-Received: MIME-Version:References:In-Reply-To:From:Date:X-Gm-Features: Message-ID:Subject:To:Cc:Content-Type:Content-Transfer-Encoding; bh=nJ6alN4H3+Zgsia4c2nyz/5yJfYPVV0Oy8Rx7dpjduk=; b=L+rBhQWwrIqhkEFD9nGxiKEjz+fYYOhFzNdp03hEwSON47tHzQIpviZai2CobDnXzee2 a3P+mQD0sziqaDYOvblodWf7ttNignrqU3zuIkkhxhFIxtXOVX/93Q2NGqRjhlRP+aAh/ 0m8m53A5cy35jWWCcr1KtY0V2/IgIO9WMczs2x7pYjkxPr6MnQ7wNlnWav/pkfLjk1kyj gk3+RhYinxDWSk2AIwdw6KxHcexhIaz2Ng/EDpr7SAdzsCmMgXwNurP6zMWzRa+lwZXxS AR9QMSViBKloGNAN/kdnU/sKwEO1CB/7sYYKl/jtIAtdhvSZHo33Ga1RjTV9TZaCyEg== ARC-Authentication-Results: i=2; smtp.subspace.kernel.org; dmarc=pass header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20260707 header.b=UG8lqduC; arc=pass header.oldest-pass=0 smtp.remote-ip=209.85.214.177 Received: from mail-pl1-f177.google.com (mail-pl1-f177.google.com [209.85.214.177]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7CD4060A381B for ; Mon, 2 Nov 2026 13:58:43 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org 7CD4060A381B Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20260707 header.b=UG8lqduC Received: by mail-pl1-f177.google.com with SMTP id d9443c01a7336-2eb4a9a580eso3217495ad.3 for ; Mon, 02 Nov 2026 05:58:43 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1793627923; cv=none; d=google.com; s=arc-20260327; b=LT71ZMBWY9rGl/kepIGHBk53nd9xSITk84TZbFNnwXi57Ryki7R2ee0hfAMIeWebfy Zm4YcksFfAfYuzkayWLupvKgcPNFluzDEU9blf2OR+bCqkavPzV3Koe9bVGS3tiTjeE+ DnV9lbbh2k+JCgjZlPKThv9wK+8EOAerAh1kBfwQz2hGCyTtltlKhZfCk8WK5ZHgLKDh fzbqicc5C5cl8I+t4/27o10W87bK28GOcFZml8h3bUynb45IfPl640WCbQaTC4HHhCB8 /rA2nc8zqQ3GAW1/GI5kAwWjs1pOqCFYfA8BGIdkb2IUuoYxEjl12cXUWadUnDAUlkf3 5IXQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20260327; h=content-transfer-encoding:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:dkim-signature; bh=nJ6alN4H3+Zgsia4c2nyz/5yJfYPVV0Oy8Rx7dpjduk=; fh=jfhU2Vne7l2qkHOJBR+eSq8FTfFlkBT0wkxlO+5yJHE=; b=ipqf/QcjVC6s9G4ysOg0SHDTh+RuFQu8VE9IlGeck34JWUSjrHdSbkTlilMvmbDVq4 GqyRecIGrnOG6O3veMDHEzudQtl9+0DW3JJBaKbkuaD4roMIm1FW9jTI9dNkIA5gG5GT d3s4bjx4QVRyb3gVnfJWLzExO7RzPVE2FTHGx6SHCTTLVpBRHdFBV811HJ8y1Lb+9QJW Jg20NJR27qLRTBc6v5E+4EQG8GkwWHY3JpnmyDn5NIil9AWJ7Cc/WlsXeodJ22L9cnzP JArWAntp3nOIcJgnuaDm06YXDZiwSUqBmsEfRLWuhncrpDQNxO2hkPVRZWU7HD6OYXcP XAcQ==; darn=vger.kernel.org ARC-Authentication-Results: i=1; mx.google.com; arc=none DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20260707; t=1793627923; x=1794232723; darn=vger.kernel.org; h=content-transfer-encoding:content-type:cc:to:subject:message-id :date:from:in-reply-to:references:mime-version:from:to:cc:subject :date:message-id:reply-to:content-type; bh=nJ6alN4H3+Zgsia4c2nyz/5yJfYPVV0Oy8Rx7dpjduk=; b=UG8lqduCFcmB3GSi/r0rOsIoNN2nxFVMA7ZH5ulYFt6RGY1r53oTxHG9LHwaNhxjOf YEncyQ238K/UZt42Ca2v+1V/MXMseWNOaftVqk9oE4vjL4fFmNS5jb98jjBzC1ksGcxS VUgAEQkQz+kv6hm3IfKGaiHE34sbhuwGz3FTfj3GDIkP1/Vd+JXsY5KPIk6+jB7ny+bG +P92D+eJgIYL4fDKgg/88fyPkCR5m0skYI+EMtpN9zN/vLgjwkV8l4bnCvb8TuGT1i6g bKmxg54r41eM1SNeHcJWSeAAsnxaHt5dRIl9GnPJG2omIdSEZVIHCnZ0H6a6YaZrJe7U BnNg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1793627923; x=1794232723; h=content-transfer-encoding:content-type:cc:to:subject:message-id :date:from:in-reply-to:references:mime-version:x-gm-gg :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=nJ6alN4H3+Zgsia4c2nyz/5yJfYPVV0Oy8Rx7dpjduk=; b=UYRrfpnJ0zniTlHlHyzhmGK668OOUrCbz6M/sXfahCpGmpflmJ+ROO/sle1NDtv6Mc pFfjr01jnaM/ORL7lDaRgOI4mVh8MRKARnmRbUhIuWcNPZ/lONETzNNlcwtFF8fSJK9W D+snU2HVKmFB24UreuLm02f87cF2uT6HiFFj3JQVXc3gLwTtdJPt55K8x9uaqzHrT4me ICiunGQ2CKzaLNafQqGtUuI6bRw/WtADWb7GjEDnFSSMx7mkw7jeV4YQITpgf9S66seg KtgmxVZH/j9e+rP1eFr48W+LLe/GFxzF6GLfjeVxxBhZmL2SdkkvQC1wErck4mOTvRmu vF6w== X-Forwarded-Encrypted: i=1; AKwUvBygPElMTYxAxraqlD/Im+xRZ91cCmWvuKaTXBPUHf6haq4sFwnewh8bAKYIEAk/r2hyN56UYLH4v2yt22c=@vger.kernel.org X-Gm-Message-State: APuU4Z++C6XKutoOZ9M5PucFDIFu2Yuiny6AkMDot3LECyLDw8XmbpGt BgCITF1ba97Qgml57RCVRcYynoac5OnxS66sJ8GMQaDEpIKBJwlFvjkHVKCMO98PCjcjm9inXXT cOiRcgrQpRwKxrJQ2gaZPVipiPjcMsvs= X-Gm-Gg: AYBFou1EfALdR1TECAmgDXcZwVkUUqwHLhV5/oTIEKBiVV1oDu0GAIUkY+OMQzT2h5o WA1ZYO733xf6Z8GbsMiSwdaC4Nn3iXQQAaOVt3ZCcllCQHch00xh8k8F4TabYR2ZCewA2JyCdan Tkl0C+VwG8YSenZ9XWp0AXZj9+CNibu0ciNKcHHg/teMy/7yEom4T4m/MQGq13mU45FTaPTifEL MbnsmqzJB7VgzejJcHsIQsld7mnZ6r8V0XwSOM34j9Ek2d21/aiTnSojhUTcQ7Ku3/k4XIWrIaT kmhRVszHiMkpYjGplcvahI9XWjXpOfsdKbjz3hG1DJ2rNL2VfsZFuj24HDNS/zk2WVyP9Te0GRH uXcoEwF4Pitqt43ZSp5BC04ph9xADq8U+W1h5UJRR7+L5wcUHCADjaY1uNVmPprZf6IrEyUGDka W08XdP4dvixMM2SVYsxKP+ZSKkuvEtNaxgyI13lWFmWg1N X-Received: by 2002:a17:902:d501:b0:2e9:6468:1ff1 with SMTP id d9443c01a7336-2eb3648bf2cmr153268595ad.2.1793627922776; Mon, 02 Nov 2026 05:58:42 -0800 (PST) X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 References: In-Reply-To: From: Alex Deucher Date: Mon, 2 Nov 2026 08:58:31 -0500 X-Gm-Features: AclHuK_W2nYNzhWcT-bUVBFipztB_PsZmQptpzSQo4X8vrE-d5Ne3PfFZ8Lk8pA Message-ID: Subject: Re: [PATCH] drm/amd/amdgpu: add firmware file fallback for APU VBIOS discovery To: Arnaud BERTRAND Cc: Oz Tiram , airlied@gmail.com, alexander.deucher@amd.com, amd-gfx@lists.freedesktop.org, christian.koenig@amd.com, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, simona@ffwll.ch Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, Nov 2, 2026 at 3:07=E2=80=AFAM Arnaud BERTRAND wrote: > > Hello, > > I have two dGPUs : a Radeon RX 6800 > XT and a Radeon RX 6800. They both report the same PCI identity > 1002:73bf and each has a different VBIOS. > I hit the same VFCT bus-number mismatch on 7.2.10, but with a different > outcome: on my machine the device-identity fallback actively breaks the s= econd > dGPU. > I patched my kernel to remove the fallback, but I would like to have a > better solution for my use case. > Would it be possible to apply the patch only to APUs ? That would keep > Oz's APU case working but a dGPU with a stale bus number would fall > through to its own ROM, which is the source that is > guaranteed to match the card in the slot. > I can provide more details if needed, I am out of my depth here. Should be fixed with this patch series: https://patchwork.freedesktop.org/series/176969/ Alex > Thanks > Arnaud