There is no evidence to confirm whether farmers protested on MSP and whether PM Manmohan Singh resolved it with farmer union leaders.
Wikimedia published a picture, in 2007, of former Prime Minister Manmohan Singh meeting farmer union leader Mahendra Singh Tikait from Uttar Pradesh to resolve a protest. Based on the available evidence, specific details are unknown about the circumstances behind the meeting and its context except for news media citing it over the years. The image was originally posted by the Press Information Bureau, the link of which now appears to be broken.
According to The Wire, the image is of Mahendra Singh Tikait, the Bhartiya Kisan Union leader, sitting with PM Manmohan Singh in New Delhi on Sept. 12, 2007. The article only mentions the similarities between protests from decades before and Tikait's involvement in them and does not contain many details about the meeting's image.
There are some videos of interviews of Mahendra Singh Tikait talking about MSP but nothing in the context of this claim.