From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id CF99AC44507 for ; Tue, 7 Jul 2026 12:58:36 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id C9FE410ECDF; Tue, 7 Jul 2026 12:58:31 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.b="QbuaaVHa"; dkim-atps=neutral Received: from mail-wm1-f43.google.com (mail-wm1-f43.google.com [209.85.128.43]) by gabe.freedesktop.org (Postfix) with ESMTPS id 0056610EC14 for ; Tue, 7 Jul 2026 10:06:44 +0000 (UTC) Received: by mail-wm1-f43.google.com with SMTP id 5b1f17b1804b1-493c5220cb7so30628145e9.3 for ; Tue, 07 Jul 2026 03:06:44 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1783418803; x=1784023603; darn=lists.freedesktop.org; h=to:from:subject:message-id:date:content-type :content-transfer-encoding:mime-version:from:to:cc:subject:date :message-id:reply-to:content-type; bh=p0NYG5TD09/yR8WkDDiynJAqcMoU3ICsbKt6BPhGobM=; b=QbuaaVHaOc9E/Dw1+BHNeotdCY7dD/UuwGUdTPcLvgzG0A4Nd9TnDz5Z51tZFY7IJ/ rJuQs/Xq/E5gitsH3Caa/0DEKybgpghzikq92wVhOlUJBEY4BhzSbzZ9wUR81PlYOKv6 3r5sHix96M4fgmReibQwCeBRFvLR8L/kPEJ9HtrGEONXE0l5g1c/VBsWRXkaywY+X2K+ qKiC8KfPweyI4UZB3bCp0j33IbZGs1OlnUQ2dI70zWbLLN7YlQTI61TvCMxLA3uPwGsO fd6cXccqNS/uvFPDL232nX/ZmrnqYoL/j5MWFs0RiZ3j6CQ7OQmeH8DmDG9c0AD88K6U BcBg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1783418803; x=1784023603; h=to:from:subject:message-id:date:content-type :content-transfer-encoding:mime-version:x-gm-gg:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to:content-type; bh=p0NYG5TD09/yR8WkDDiynJAqcMoU3ICsbKt6BPhGobM=; b=Bd0BTaRkX8k3o/QtUkVQkpyX6e7itkrVqrwr1l51kFCggK70apLngEckSFUeWAd6AK Vz6vyZS+ctdmltgxSCKYsjnA5XMMUWMmhMng3/IDMnkD8+C1yr+DEqu6wP4Hk8mtyq8q aSvcWnVnhLkRGEAvqCBTuwZGobent5Cl2j9rDCNWYSoC6KsMo3GroX4pthZc6RR+WhRA DrLK9GCudeBdgaI+mECnn6zBTyiA/YKG2z0fPHdB/UFg+zuSzFFkO78v+u35gQGRQqLs ib0KCWo4CJu+glRpuWbwXONdF0WhStqGr4x10hnd2WVn/hP3YLOq5HFBtYYIs8t1wsyP h20w== X-Gm-Message-State: AOJu0Yx85tkk79Ni8Ymt2glleVNwo3WDUGjTIK4UIFABWOCOKE4PcASS Y/JHU9cQ8HTmOrFJw+WrqmZEUoB9QyLQ7cK3z8FtxeniP4RgfubR6zpSqPz2Oeit X-Gm-Gg: AfdE7cmfe1thLtX4qk1be5LzwamSZaxWTBjDeCeDnAlAJG0F+We7iRbf6SN4xcHBZRp 0UnD+j69mVWul3ts2xpQOw0PB+R+AZanjz2Z62Ocnueax7zPeKYqraf0rddfTWm7RJXPN5MngFg jvrNzJcR/y2IdgiElCYVmY2BnlWlQlZomCmiaRIX/QA3TAcrqvSoOuWf1V7JrzrwPD6Mq3ZhPr3 eJNUFFvQj71PQNJ6ZIdoIv8S6ICeSMzoga8u9fi2j8ME+cPwqSc1p2rAgxYDNddEW2DdOJc0c+k 8+Hc0BlCS5ssSH1JiHDqWahyGaHvRjhtTD6AIJNg8b2Q1jkMPyIxWf1Z5B3ERVird8d4GFpTOwA sXgOvHdDr25x91J5ersBhLxIO9mPsyw6EtKeMzYZuMhcoTkreJPfNU2Nvsz9y0XK70k+8YK0+Ef BqyqECmA+2Jwcj5Zm4 X-Received: by 2002:a05:600c:3b01:b0:493:c389:d436 with SMTP id 5b1f17b1804b1-493df041c46mr45256345e9.9.1783418803241; Tue, 07 Jul 2026 03:06:43 -0700 (PDT) Received: from localhost ([193.30.163.202]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-493e0fbd355sm40383395e9.13.2026.07.07.03.06.42 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 07 Jul 2026 03:06:42 -0700 (PDT) Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Tue, 07 Jul 2026 12:06:42 +0200 Message-Id: Subject: Question about HF-EEODB EDID extension override handling From: =?utf-8?q?Timo_Pr=C3=B6mer?= To: X-Mailer: aerc 0.21.0-0-g5549850facc2 X-Mailman-Approved-At: Tue, 07 Jul 2026 12:58:30 +0000 X-BeenThere: amd-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussion list for AMD gfx List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: amd-gfx-bounces@lists.freedesktop.org Sender: "amd-gfx" Hi, I am trying to get my Samsung Odyssey Neo G8 to run on 3840x2160@240Hz over HDMI 2.1 (Linux 7.2-rc2), but that mode does not show up. I noticed that the EDID only contains block 0 and 1, even though the HF-EEODB specifies an extension block count of 3. >From my reading, the EDID parsing code in 'drivers/gpu/drm/drm_edid.c'=20 does respect this override as far as i can tell. However I also found some code that appears to be copying / truncating the= =20 EDID in 'drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c:1208' (function: 'dm_helpers_read_local_edid') without accounting for this overri= de. I am new to kernel-level development, so I apologize in advance if I=20 am misunderstanding the intended flow here. Could this be the reason for my incomplete EDID? The kernel does not log any EDID-related errors or warnings, so I am not sure whether this is expected behavior or a bug. Please keep me on Cc; I am not subscribed to the list. Thanks, Timo Pr=C3=B6mer