Distro in use
First let me ask, what distribution of Linux are you running on your laptop?
Second, just to clarify, you said that your laptop connects to your wireless router just fine, and that you can ping other devices on your network with the wireless laptop, but you cannot reach the internet, correct?
If this is accurate, it sounds like it may be a DNS issue. If you want to test if it is a DNS issue, try pinging a public address on the internet from your wireless laptop (For example, google's address at 184.108.40.206) If this works, you have a DNS related issue. However, if it doesn't work, it is a routing issue.