Thank you Christopher for the feedback, I just tested the latest upstream kernel ap per your instructions and I still get the same errors.
$ uname -a Linux cosmo 4.4.0-040400rc3-generic #201511300321 SMP Mon Nov 30 03:23:36 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux ** Tags added: kernel-bug-exists-upstream kernel-bug-exists- upstream-4.4-rc3 ** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1523178 Title: SD card reader on Dell E7450 doesn't work in Ubuntu 15.10 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1523178/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs