Confirming that this is a new regression in a fresh install of 10.10 final release from 10.04 (kept my /home partition). I have a combination of a Microsoft Wired Keyboard 600 (all media keys cause the hang) and an A4Tech USB mouse.
Notably pressing the XF86Calculator key causes a mouse selection to begin on the desktop that can only be cancelled by pressing Esc. Mouse continues to move and some regular keys respond, left mouse button will not work, Ctrl-Alt-Bksp to restart X server fixes the issue. lsusb: Bus 004 Device 003: ID 09da:0006 A4 Tech Co., Ltd Optical Mouse WOP-35 / Trust 450L Optical Mouse Bus 003 Device 002: ID 045e:0750 Microsoft Corp. -- microsoft wireless desktop 5000 multimedia keys hang maverick https://bugs.launchpad.net/bugs/633830 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