Based on the hardware architecture of the VPCEB3E4E/PCG-81212M, the following drivers are essential for full functionality. The original Sony links are largely defunct; therefore, primary sources are identified as the or the Original Equipment Manufacturer (OEM) websites.
Official Sony support pages categorize downloads by these "VPC" names, not the "PCG" chassis codes. 2. Official Driver Download Steps
If you have a missing driver’s Hardware ID, reply with it and I’ll help locate the exact working version for your Sony Vaio PCG-81212M.