Fix Can't Get 2560x1080 Resolution On External Monitors When Connected To Few Dell Computers
https://www.intel.com/content/www/us/en/download/19344/723911/intel-graphics-windows-dch-drivers.html
Fix Resolution 2560x1080 not available for external monitor LG 29UM59-P On Dell Inspiron 5593,Dell Inspiron 5593 w/ i5 -1035G1 w/ Intel UHD Does Not Show 2560x1080 resolution On External Monitor,Fix Dell Inspiron 5593 laptop does not output 2560x1080 resolution on my ultrawide monitor,Fix can't get the 2560x1080 Resolution On HP and LG monitors When Connected to Dell Computer,Fix Not able to get a 2560x1080 to work On External Monitor When Connected to Dell Computer,Resolution on External Monitor Limited to 1920 x 1080 or 1900 x1200 when connected to certain Inspiron, Vostro, and OptiPlex computers using an HDMI cable
Install this Intel Driver: https://www.intel.com/content/www/us/en/download/19344/723911/intel-graphics-windows-dch-drivers.html
Update Windows to the latest version
https://www.dell.com/support/kbdoc/en-us/000126548/resolution-on-external-monitor-limited-to-1920-x-1080-using-hdmi