I recently purchased a 21:9 LG monitor (model 29UM57) and I'm having difficulty getting my 2013 MBA to output to 2560x1080, which is the monitor's resolution. My max resolution is 1080p.
I purchased this MDP-HDMI adapter, Cable Matters® Gold Plated Mini DisplayPort (Thunderbolt™ Port Compatible) to HDMI Male to Female Adapter - 4K Resolution Ready, hoping that it would help my situation, but my max resolution has not changed.
I'm wondering whether ordering this HDMI cable, AmazonBasics High-Speed HDMI Cable - 6.5 Feet (2 Meters) Supports Ethernet, 3D, 4K and Audio Return, will fix my problem. I don't know what version or whatever my current HDMI cable is.