Asia stocks gained on Monday with investors piling back into the financial sector after a smaller than expected loss at U.S. giant Citigroup late last week. Major banks such as Hong Kong's HSBC were among the top performers. But around the region signs that demand is weak and inflation continues to rise. New research showed personal computer shipments in Asia grew by a less than expected 15 percent in the second quarter. The data excluded Japan but showed that growth in key markets such as India and Korea was softer than expected. China PC maker Lenovo saw the largest market growth with 18 percent of Asia's market share. Taiwan producer Acer took fourth place in share of market growth behind U.S. computer makers. Vietnam raised fuel prices by as much as 36 percent just two weeks after the government ruled out a rise in fuel prices for the rest of the year. The steep increase came as a shock to consumers and the country now follows other Asian nations which have hiked consumer...