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I've mapped my capslock key to control using the Modifier Keys mapping in System Preferences: Keyboard. I've also tried mapping to "right control" instead of "left control" as per using a plist editor.

The mapping seems to work in all cases except one: I can't use capslock with left-shift to make key mappings or apparently do anything else. capslock (as control) with right-shift works. I'm primarily testing by using control-tab / control-shift-tab to switch between tabs. Using the on-screen-keyboard viewer, I can get capslock-shift-(just about anything) to work, but not capslock-leftshift-tab.

My best guess is that somehow the particular keyboard I'm working on is faulty, but I'm curious whether anyone else can reproduce this or has any ideas.

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I've also assigned caps lock to control, and am not having that issue. Caps lock plus either shift works for me (on Lion). – user495470 Nov 28 '11 at 18:14
Does it also happen when you don't remap, and press L-Ctrl, L-Shift, Tab and then Capslock? – Daniel Beck Nov 28 '11 at 18:54
What keyboard model do you use? – Daniel Beck Nov 28 '11 at 18:55
Keyboard: – keflavich Nov 28 '11 at 19:09
Yes, if I hold L-Ctrl, L-Shift, Tab, then try to press capslock, it doesn't work. R-Ctrl, R-Shift, Tab, capslock does. – keflavich Nov 28 '11 at 19:11
up vote 2 down vote accepted

This is a rather common phenomenon, especially with cheap keyboard. You probably have a keyboard that is not designed to handle simultaneously pressing these three keys.

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As far as I can tell, this is what happened: the model I have doesn't let those three keys press simultaneously. I've tested on an identical model. Darn. – keflavich Dec 2 '11 at 21:12

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