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
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=47309c6a6af8c ce3586c735788fc 978bbcd7249f
http:// kernel. ubuntu. com/git? p=ubuntu/ ubuntu- lucid.git; a=commitdiff; h=55b5b5448771f 964776a716227af d3ddef2c860e
Comparison was between kernel. ubuntu. com/git? p=ubuntu/ ubuntu- lucid.git; a=history; f=drivers/ usb/serial; hb=9b670926f424 19456004af7527e 0a3dfa85453f2
http://
and kernel. ubuntu. com/git? p=ubuntu/ ubuntu- lucid.git; a=tree; f=drivers/ usb/serial; hb=7fd5c4f3ed5a d63d8b8511bfc90 afa0792bc68a1
http://