Ibrahim says that al-Aswad and Amr bin Maymun both narrate: We prayed the Fajr prayer behind Sayyiduna Umar (may Allah be pleased with him), and he did not recite qunut.
Although Mansur is more retentive and more reliable than Hammad bin Abi Sulayman, Hammad's narration on this matter agrees with the well-known position of Sayyiduna Umar (may Allah be pleased with him) regarding qunut.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 3113