A bit of eyeball comparison of the repository for the two kernels suggests two commits that might be at fault - just because the changes occur in the right time frame, it's hard to see why they could cause the problem.
http://kernel.ubuntu.com/git?p=ubuntu/ubuntu- lucid.git;a=commitdiff;h=47309c6a6af8cce3586c735788fc978bbcd7249f http://kernel.ubuntu.com/git?p=ubuntu/ubuntu- lucid.git;a=commitdiff;h=55b5b5448771f964776a716227afd3ddef2c860e Comparison was between http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-lucid.git;a=history;f=drivers/usb/serial;hb=9b670926f42419456004af7527e0a3dfa85453f2 and http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-lucid.git;a=tree;f=drivers/usb/serial;hb=7fd5c4f3ed5ad63d8b8511bfc90afa0792bc68a1 -- FTDI based USB to serial adapter no longer works https://bugs.launchpad.net/bugs/655868 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
