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[89.3.64.130]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-483a31bc0e3sm109732405e9.5.2026.02.20.23.37.25 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Fri, 20 Feb 2026 23:37:26 -0800 (PST) From: Jerome Tollet X-Google-Original-From: Jerome Tollet To: intel-gfx@lists.freedesktop.org Cc: dri-devel@lists.freedesktop.org Subject: Re: [RESEND] drm/i915/hdmi: Poll for 200 msec for TMDS_Scrambler_Status Date: Sat, 21 Feb 2026 08:37:24 +0100 Message-ID: <20260221073724.85291-1-jtollet@cisco.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <[email protected]> References: <[email protected]> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Mailman-Approved-At: Mon, 23 Feb 2026 13:54:29 +0000 X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" Hi Ankit, I've completed isolated testing and can confirm the SCDC polling patch works perfectly. Test results: - Kernel: 6.19.2 - Hardware: Intel Alder Lake-N (N100) with integrated UHD Graphics - Display: Cisco Desk Pro (CS-DESKPRO-2) 4K@60Hz via HDMI 2.0 - Status: 4K@60Hz (3840x2160@60Hz) working correctly - Result: Stable display, no corruption, works across reboots The SCDC polling approach is also more consistent with other implementations like Windows, which performs similar SCDC polling after port enable. Relevant dmesg output: [ 5.491988] i915: loading out-of-tree module taints kernel. [ 6.104904] i915 0000:00:02.0: [drm] Found alderlake_p/alderlake_n (device ID 46d1) integrated display version 13.00 stepping D0 [ 6.218551] i915 0000:00:02.0: [drm] GT0: GuC firmware i915/tgl_guc_70.bin version 70.49.4 [ 6.268439] [drm] Initialized i915 1.6.0 for 0000:00:02.0 on minor 1 [ 6.691347] i915 0000:00:02.0: [drm] fb0: i915drmfb frame buffer device Thanks, Jerome