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[114.36.223.64]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-20af1863562sm5581595ad.298.2024.09.24.00.36.50 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 24 Sep 2024 00:36:50 -0700 (PDT) From: Chris Chiu To: kernel-team@lists.ubuntu.com Subject: [SRU][N][PATCH 0/3] Fix blank screen on external display after reconnecting the USB type-C Date: Tue, 24 Sep 2024 15:36:43 +0800 Message-Id: <20240924073646.1036150-1-chris.chiu@canonical.com> X-Mailer: git-send-email 2.34.1 MIME-Version: 1.0 X-BeenThere: kernel-team@lists.ubuntu.com X-Mailman-Version: 2.1.20 Precedence: list List-Id: Kernel team discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: kernel-team-bounces@lists.ubuntu.com Sender: "kernel-team" BugLink: https://bugs.launchpad.net/bugs/2081786 [Impact] The laptop of Intel RPL platform connects the external display via the HDMI/DisplayPort on a USB Type-C interfaced dock with dual type-C cable connected (WD19DC). The external display will stay blank after re-connect the docking station. It was observed on WD19DC with monitor 4K@60fps mode. [Fix] The upstream fix in kernel 6.11 594cf78dc36f ("drm/i915/dp_mst: Fix MST state after a sink reset") and its dependency are required. [Test Case] 1. Connect the external monitor via the WD19DC docking station to the Intel powered laptop 2. Switch the monitor to 4K resolution and maximum refresh rate (>= 60fps)cul 3. Re-plug the WD19DC and check if the external display comes back in blank or normal. [Where problems could occur] Only observed on particular docking station and monitor. The risk should be low. Imre Deak (1): drm/i915/dp_mst: Fix MST state after a sink reset Jani Nikula (2): drm/i915/display: add generic to_intel_display() macro drm/i915/display: add intel_display -> drm_device backpointer .../gpu/drm/i915/display/intel_display_core.h | 3 ++ .../drm/i915/display/intel_display_device.c | 3 ++ .../drm/i915/display/intel_display_types.h | 37 +++++++++++++++++ drivers/gpu/drm/i915/display/intel_dp.c | 12 ++++++ drivers/gpu/drm/i915/display/intel_dp_mst.c | 40 +++++++++++++++++++ drivers/gpu/drm/i915/display/intel_dp_mst.h | 1 + 6 files changed, 96 insertions(+)