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[2001:1c00:c0c:fe00:fc7e:fd47:85c1:1ab3]) by smtp.gmail.com with ESMTPSA id r28sm3721723wra.16.2020.02.26.07.15.42 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 26 Feb 2020 07:15:43 -0800 (PST) From: Hans de Goede Subject: 5.6 DP-MST regression: 1 of 2 monitors on TB3 (DP-MST) dock no longer light up To: Lyude Paul Message-ID: <99213368-5025-8435-502b-3d23b875ca60@redhat.com> Date: Wed, 26 Feb 2020 16:15:42 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 Content-Language: en-US X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: intel-gfx , "dri-devel@lists.freedesktop.org" Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Hi Lyude and everyone else, Lyude I'm mailing you about this because you have done a lot of work on DP MST, but if this rings a bell to anyone else feel free to weigh in on this. I'm currently using a Lenovo X1 7th gen + a Lenovo TB3 gen 2 dock as my daily rider for testing purposes. When 5.6-rc1 came out I noticed that only 1 of the 2 1920x1080@60 monitors on the dock lights up. There are no kernel errors in the logs, but mutter/gnome-shell says: gnome-shell[1316]: Failed to post KMS update: Page flip of 93 failed With 93 being the crtc-id of the crtc used for the monitor which is displaying black. Since then I've waited for 5.6-rc3 hoping that a fix was already queued up, but 5.6-rc3 still has this problem. gnome-shell does behave as if all monitors are connected, so the monitor is seen, but we are failing to actually send any frames to it. I've put a log collected with drm.debug=0x104 here: https://fedorapeople.org/~jwrdegoede/drm-debug.log This message stands out as pointing to the likely cause of this problem: [ 3.309061] [drm:intel_dump_pipe_config [i915]] MST master transcoder: Regards, Hans _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel