From patchwork Tue Aug 17 06:18:50 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Aaron Ma X-Patchwork-Id: 1517560 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=lists.ubuntu.com (client-ip=91.189.94.19; helo=huckleberry.canonical.com; envelope-from=kernel-team-bounces@lists.ubuntu.com; receiver=) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=canonical.com header.i=@canonical.com header.a=rsa-sha256 header.s=20210705 header.b=eI1Vyw1r; dkim-atps=neutral Received: from huckleberry.canonical.com (huckleberry.canonical.com [91.189.94.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 4Gpgq43yjgz9sT6; Tue, 17 Aug 2021 16:19:27 +1000 (AEST) Received: from localhost ([127.0.0.1] helo=huckleberry.canonical.com) by huckleberry.canonical.com with esmtp (Exim 4.86_2) (envelope-from ) id 1mFsRU-00074u-Am; Tue, 17 Aug 2021 06:19:20 +0000 Received: from smtp-relay-canonical-1.internal ([10.131.114.174] helo=smtp-relay-canonical-1.canonical.com) by huckleberry.canonical.com with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.86_2) (envelope-from ) id 1mFsRN-00074h-LH for kernel-team@lists.ubuntu.com; Tue, 17 Aug 2021 06:19:13 +0000 Received: from localhost.localdomain (unknown [222.129.32.23]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by smtp-relay-canonical-1.canonical.com (Postfix) with ESMTPSA id 48CAF3F367 for ; Tue, 17 Aug 2021 06:19:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=canonical.com; s=20210705; t=1629181153; bh=J3g5Y0C9X99kHk4jFm3qFGTc25v1H19KbAQTZhJF14s=; h=From:To:Subject:Date:Message-Id:MIME-Version:Content-Type; b=eI1Vyw1rVAedGR/aMm9J0UVI+u+UDzN/IRtXCU8pN89TrfnaAgLoNcwEPwx6ecBMn xA+1iRI7I7lXcAA1Df8dTQYSX1j11er11ur3midxmfAYr0KTjNzKr6cKsFkrmZMEwT A2tBoNppGFCJkigqp/FGRhWrYs0LZekXhdbNXjLP2k0b2nIZdaZ5XXrO+tcANTQHgQ 9pSKOCi7fLuIxeYRj8HbRxVMuD2RpMT+5eBF67ZNoa2/gmCbVwrJDi8CPx9q990xlI h6f2Uc9qGb94fPmozExfT/P1H9y3KRLP+/ntLfX/zzFpPEW8PMb8o+pHBn0iopSiJt DnbvxpqaQjeMA== From: Aaron Ma To: kernel-team@lists.ubuntu.com Subject: [SRU][H][PATCH 0/1] Fix no external DP output on some monitors Date: Tue, 17 Aug 2021 14:18:50 +0800 Message-Id: <20210817061851.6258-1-aaron.ma@canonical.com> X-Mailer: git-send-email 2.32.0 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/1938999 [Impact] External displays not working on Thinkpad T490 with ThinkPad Thunderbolt 3 Dock [Fix] Some SKL systems DP output fails when AUX timeout of LTTPR detection. Disable the LTTPR detection until GLK to fix the link training. [Test] Verified on hardware, external DP work fine. [Where problems could occur] It may break output of external DP. This patch from 5.12-rc5, only Hirsute kernel is SRUed. Imre Deak (1): drm/i915/ilk-glk: Fix link training on links with LTTPRs drivers/gpu/drm/i915/display/intel_dp.c | 7 +++++++ .../gpu/drm/i915/display/intel_dp_link_training.c | 15 ++++++++++++--- 2 files changed, 19 insertions(+), 3 deletions(-)