Thanks for reporting a bug and making Ubuntu better.
More information would be needed in order to diagnose your problem. First, the best way to report a bug is to press ALT-F2 and enter ubuntu-bug followed by the name of the package you have an issue with (for instance "ubuntu-bug unity").
Second, has this problem appeared when you upgraded to 11.04? Does it happen if you suspend from "Ubuntu Classic" instead than from "Unity" ("Ubuntu")?
It may be that your issue is with the Linux kernel, usually responsible of freezes on suspend/hibernate.
Thanks for reporting a bug and making Ubuntu better.
More information would be needed in order to diagnose your problem. First, the best way to report a bug is to press ALT-F2 and enter ubuntu-bug followed by the name of the package you have an issue with (for instance "ubuntu-bug unity").
Second, has this problem appeared when you upgraded to 11.04? Does it happen if you suspend from "Ubuntu Classic" instead than from "Unity" ("Ubuntu")?
It may be that your issue is with the Linux kernel, usually responsible of freezes on suspend/hibernate.