A roundup of tech ratings changes: 1) BNP Paribas has started Baidu (BIDU +1.6%) at Buy. 2) Longbow has upgraded Seagate (STX +4.1%) and Western Digital (WDC +2.9%) to Buy. 3) Pac Crest has started Synchronoss (SNCR +2.9%) at Outperform. 4) Lazard has upgraded Trimble (TRMB +2.5%) to Buy. 5) BMO and RBC have downgraded Rogers (RCI -1.9%) to Market Perform/Sector Perform, and BMO has also downgraded Telus (TU -2.4%) to Market Perform. However, Stifel has upgraded Telus to Buy. (yesterday). 6) HSBC has upgraded Sohu (SOHU +3.8%) to Neutral. 7) China Mobile (CHL +1.7%) has been upgraded to Neutral by BofA/Merrill. 8) Atmel (ATML +1.4%) has been upgraded to Buy by Lazard. 9) Flir Systems (FLIR +2.1%) has been upgraded to Overweight by Stephens.