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Mon, 30 Apr 2018 15:14:53 +0000 To: harry.wentland@amd.com Cc: alexander.deucher@amd.com, alexander.deucher@amd.com, christian.koenig@amd.com, David1.Zhou@amd.com, airlied@linux.ie, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, "linux-kernel@vger.kernel.org" , "1761751@bugs.launchpad.net" <1761751@bugs.launchpad.net> From: Joseph Salisbury Subject: [REGRESSION] drm/amd/dc: Add dc display driver (v2) Openpgp: preference=signencrypt Autocrypt: addr=joseph.salisbury@canonical.com; prefer-encrypt=mutual; keydata= xsFNBE8KtKMBEADJ3sa+47aMnk7RF/fn4a7IvRDV19Z1L2Qq1c6dxcvtXP9Mq0i95hBgPnNB 2FFJJ4QvJUJ6hYaniqgX3VkvKvjOcOwKz78NYF0HuIZqTTwd2qWpECXqtxPSOstvEGwY0nEC QE7e1kELFiQo/2GYwFn2sAGKKPEHCxO7lon1fLbP0Y262GxITgBL6/G6zLg+jxCRH/8INXYE lPOF9w+wY6rifwwtkax7NO/S56BNH/9ld7u4GT76g1csYlYP2G+mnkSmQODYojmz5CZ3c8J7 E1qSGnOrdx3+gJRak1YByXVn/2IuK22yS5gbXGnEW4Zb7Atf9mnvn6QlCNCaSOtk8jeMe0V3 Ma6CURGnjr+En8kVOXr/z/Jaj62kkmM+qj3Nwt7vqqH/2uLeOY2waFeIEjnV8pResPFFkpCY 7HU4eOLBKhkP6hP9SjGELOM4RO2PCP4hZCxmLq4VELrdJaWolv6FzFqgfkSHo/9xxeEwPNkS k90DNxVL49+Zwpbs/dVE24w7Nq8FQ3kDJoUNnm8sdTUFcH9Jp1gstGXutEga6VMsgiz1gaJ4 BtaWoCfvvMUqDRZTnsHjWgfKr3TIhmSyzDZozAf2rOSJPTMjOYIFYhxnR7uPo7c95bsDB/TL Rm38dJ2h5c0jJZ5r4nEQMAOPYxa+xtNi64hQUQv+E3WhSS4oXwARAQABzTFKb3NlcGggU2Fs aXNidXJ5IDxqb3NlcGguc2FsaXNidXJ5QGNhbm9uaWNhbC5jb20+wsF7BBMBAgAlAhsDBgsJ CAcDAgYVCAIJCgsEFgIDAQIeAQIXgAUCWc1buAIZAQAKCRBs7z0nylsUHmq2EACuSuxq7/Mw skF27JihJ/up9Px8zgpTPUdv+2LHpr+VlL8C3sgiwbyDtq9MOGkKuFbEEhxBerLNnpOxDp3T fNWXeogQDJVM3bqpjxPoTSlcvLuGwtp6yO+klv81td1Yy/mrd9OvW3n2z6te+r1QBSbO/gHO rcORQjskxuE7Og0t6RKweVEH5VqNc/kWIYjaylBA9pycvQmhzy+MMxPwFrTOE/T/nY86rJbm Nf9DSGryMvjPiLCBCkberVl6RExmP4yogI6fljvzwUqVktuOfWmvAFacOkg2/Ov5SIGZMUCP J1rxqKDfPOS54rptZ/czF0L1W8D2FNta8+DOKMgZQKjSh/ZvJsJ5ShbzXfij3Covz8ILi9WH IjX+vT7mKKhgMoVkxLELEDfxRTlisZAjtu+IiEa6ZhL0W8AEItl7e8OTqNqxguzY4mVVESzJ hrDgtnHZf52dZDPxlXgM7jVpBA+b2OQaahmWnBFewc6+7wxHSmw3uctkJB6qmgh5+lxVK9Cl 5jVs97wup4b6TvRB0vxo6Jg+y9HYSltTeJAL5uQZthR884rxvKFsuDNwi7GO7X/X7+EiFUy+ yrdFPuzcEKgOeaqpFLcwzoS1PP9Mp8rfdVs6mUsYrTdZEa/I/a7sTBYulV3fZocJdb0n7aW0 OJxB5Ytm+qhWGoWj/kJq3Ikkts7BTQRPCrXUARAAzu5JEmGNouz/aQZZyt/lOGqhyKNskDO5 VqfOpWCyAwQfCE44WZniobNyA6XJbcSMGXbsdSFJn2aJDl9STD1nY3XKi4bxiE0e6XzAA4XW 15DtrEi7pvkd7FMTppVHtpsmNrSMN/yWzsHNlnXfDP0S972SGyHGv+XNzCUqtiQngGTuY8NJ 3+BzQk4lgCIH3c/6nIiinqNUOGCwLgBwiE8IiHSm+RUj0foGAkdcuLjt9ufR8G5Hw7KWjI98 lg0R/JXLQFWgufheYMSEMJeElY0XcZ1c/iwL4TBeU5wu/qbgxd5jYTAKB2vRWAhrx5pOAEHv nOSKk06phE72TT2cQB2IgjtZDC96IorI6VPJsuEuser+E8gfswY+9Zfi97ltkZ3xwmM6JF4y JUl5vK04xkxPXTdQsdnQlXWyTsJsZORT96msBm3GNwrqp/xhvoGetDlzH8SOKBMNiQbR73Ul 5RP1er9n2Qp7wpg+S8Zq8NcVVBvLi17J845szP6YmakwCyb6X8Z0BBOnF4+MTNhKqEf/b2Fg ycj4vTn866usCMm8Hp3/0W+MyjKF52hz8MIe87c+GQKKDbovRGCXNvJ4fowLxV9MKMtftdOk TzwsAuk0FjkzPjo+d1p5UPruq47kZF1PUEx0Hetyt5frAmZaq4QV6jvC2V67kf1oWtlmfXiC hN0AEQEAAcLBXwQYAQgACQUCTwq11AIbDAAKCRBs7z0nylsUHuinEACUdbNijh6kynNNR0d2 onIcd5/XfkX0eCZhSDUJyawcB65iURjuLP6mvMVtjG0N7W5eKd4qqFBYWiN8fSwyOK4/FhZB 7FuBlaKxKLUlyR+U17LoHkT69JHVEuf17/zwbuiwjD1JF1RrK3PAdfj88jwrAavc6KNduPbB HJ6eXCq7wBr1Gh2dP4ALiVloAG0aCyZPrCklJ/+krs8O5gC3l/gzBgj8pj3eASARUpvi5rJp SBGaklNfCmlnTLTajTi5oWCf0mdHOuZXlmJZI7FMJ0RncBHlFCzDi5oOQ2k561SOgyYISq1G nfxdONJJqXy51bFdteX/Z2JtVzdi+eS7LhoGo0e7o7Ht2mXkcAOFqJ3QNMUdv8bujme+q8pY jL0bDYNanrccNNXCH7PrnQ26e1b41XdrzdOLFt07jbzNEfp5UPz5zz3F9/th4AElQjv4F9YJ kwXVQyINxu3f/F6dre8a1p4zGmqzgBSbLDDriFYjoXESWKdTXs79wmCuutBKnj2bAZ4+nSVt Xlz7bDhQT9knp59txei2Z9rWsLbLTpS2ZuRcy3KovqY93u3QHPSlRe7z8TdXzCwkqcGw0LEm Qu4cewutDo+3U3cY+lRPoPed+HevHlkmy1DAbYzFD3b7UUEZ5f4chuewWhpwQ2uC1fCfFMU0 p24lPxLL08SuCEzuBw== Message-ID: Date: Mon, 30 Apr 2018 11:14:50 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8BIT Content-Language: en-US Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Harry, A kernel bug report was opened against Ubuntu [0].  After a kernel bisect, it was found the following commit introduced the bug: commit 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c Author: Harry Wentland Date:   Tue Sep 12 15:58:20 2017 -0400     drm/amd/dc: Add dc display driver (v2) The regression was introduced as of v4.15-rc1 and still exists in current mainline.  The commit does not need to be reverted to resolve the bug.  Disabling the CONFIG_DRM_AMD_DC_PRE_VEGA option makes the bug go away.     I was hoping to get your feedback, since you are the patch author.  Do you think gathering any additional data will help diagnose this issue?     Thanks, Joe [0] http://pad.lv/1761751