From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0DA51606A327 for ; Sat, 14 Nov 2026 03:01:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=m+HwHgf/ Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 5E51810E500; Sat, 14 Nov 2026 03:01:45 +0000 (UTC) Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) by gabe.freedesktop.org (Postfix) with ESMTPS id 9409810E500 for ; Sat, 14 Nov 2026 03:01:39 +0000 (UTC) Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id 773824358D for ; Sat, 14 Nov 2026 03:01:39 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPS id 5904C1F000C5 for ; Sat, 14 Nov 2026 03:01:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794625299; bh=B7vrw37aqxymd8hCSR1Ob9elrXuC1vF/HQ3HcMQ1Z7M=; h=From:To:Subject:Date:In-Reply-To:References; b=m+HwHgf/jkvp7Z2fczIJ0jVoaq28sOtISzCK0k8HvGHhmQAnCFXEBJX7s9MhCT+tp dsWLjIIUhRdARiwetHdRiXkDXoJ75dxcVzNAm5YDBUmDe3ZggthRjciYFNvrlJg8n/ T7pb7zpIQ++rxTXvFgRSZKmF3Po7zDXSZPp8iCqky3FG/LdV7heAMN9c5OnX/Qxhlo 1x5tVcIdyp6xLeRLmjUFut9rMwjy75j/nqxlMlb9B3yUQTtDX6PrRzPoQx0gXOkX8i mFTvSRTLyMLEB/m8+EmsuMBsEo0t//5VMTWj8kEYf+46IZAh967kfTtVdeSvNO8dBE i8lpQVfFMK+pw== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id 513CFC41616; Sat, 14 Nov 2026 03:01:39 +0000 (UTC) From: bugzilla-daemon@kernel.org To: dri-devel@lists.freedesktop.org Subject: [Bug 222265] amdgpu: RX 7600 defaults to limited RGB range (washed-out blacks) over HDMI since kernel 7.3.4 Date: Sat, 14 Nov 2026 03:01:39 +0000 X-Bugzilla-Reason: None X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: AssignedTo drivers_video-dri@kernel-bugs.osdl.org X-Bugzilla-Product: Drivers X-Bugzilla-Component: Video(DRI - non Intel) X-Bugzilla-Version: 2.5 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: mister.freeman@laposte.net X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: drivers_video-dri@kernel-bugs.osdl.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugzilla.kernel.org/ Auto-Submitted: auto-generated X-Archived-By: MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "dri-devel" X-Spam-Status: No, score=-5.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 https://bugzilla.kernel.org/show_bug.cgi?id=3D222265 --- Comment #2 from Barto (mister.freeman@laposte.net) --- ### Additional technical findings for bisecting / root cause: - Simply clearing the `YCbCr 4:4:4` and `YCbCr 4:2:2` capability bits inside the CTA-861 extension block (while keeping the CTA-861 block intact) does **not** fix the issue at boot; `amdgpu` still defaults to limited RGB range (16-235). - Completely stripping the CTA-861 extension block (reducing the EDID to a 128-byte Base EDID 1.3 block so the driver treats the HDMI output as a DVI-= D PC monitor) immediately restores Full RGB range (0-255) from early KMS boot. - This points directly to a regression in `amdgpu`'s default HDMI / CTA-861 color format or RGB quantization range selection logic introduced in kernel 7.3.x. --=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.=