SharePoint SP2 has introduced the systematic redirection to the MySite when you display the details of a user.

In most scenarios this does not have any impact, but some companies don’t use the MySite and in such a case redirection needs to be deactivated.

Fortunately, it’s very easy to deactivate the redirection by writing a feature that will prevent controls which redirect to be rendered. This can be done using Delegate Controls, which are described in this article.

feature.xml :

<?xml version="1.0" encoding="utf-8"?>
<Feature
  Id="6630E84A-F21D-4c9d-BA71-CDB7785E0787"
  Title="Yvand.BypassMysite"
  Description="Display user details in userdisp.aspx page within the site collection, as per pre-SP2 behavior."
  Creator="Yvan Duhamel"
  Version="1.0.0.0"
  Scope="Farm"
  Hidden="FALSE"
  xmlns="http://schemas.microsoft.com/sharepoint/">
  <ElementManifests>
    <ElementManifest Location="MySiteFeatureElements.xml" />
  </ElementManifests>
</Feature>

MySiteFeatureElements.xml :

<Elements xmlns="http://schemas.microsoft.com/sharepoint/">
    <Control Id="GlobalSiteLink1" Sequence="50" ControlSrc="" />
    <Control Id="GlobalSiteLink2" Sequence="50" ControlSrc=""/>
    <Control Id="ProfileRedirection" Sequence="50" ControlSrc=""/>
</Elements>

Once the feature is installed, it can be activated at farm level (Central Administration > Operations > Manage Farm Features) to immediately deactivate the redirection to MySite.