Acer, ASUS, Dell, Lenovo and HP will begin to mass produce Intel-powered ultrabooks in September, on schedule for a second-half launch, DigiTimes reported on Tuesday. ASUS’ UX21 ultrabook will be the first such device to market, despite reports to the contrary that HP would release its device before ASUS. Instead, HP’s ultrabook may not launch until the fourth quarter or early next year, a far cry from the original rumored August launch date. Models from Acer and Dell could be late to the market, too, due to slower than expected panel production. Intel introduced its ultrabook roadmap in May and hopes the devices, which will be powered by the company’s latest Core processors and 22nm Ivy Bridge processor, will dominate 40% of the consumer market by the end of 2012.