For me, the calculator button works but I'm having trouble with the zoom
slider.

I tried 3 different methods described in the HotKeyResearch page.  None
of them reported any keycodes, or even had any response to my presses
whatsoever.

The Gentoo site says the following about the zoom key:
"Due to limitations of X11 protocol (no keycodes outside 9—255 range are 
allowed), some kernel keycode bindings should be fixed in order to make zoom 
throttle and «Spellcheck» key work under X. Apply the following patch to 
include/linux/input.h file of kernel sources (only 3 lines are changed):

File:

--- /usr/src/linux/include/linux/input.h.orig       2007-12-31 
12:36:02.000000000 +0300
+++ /usr/src/linux/include/linux/input.h    2007-12-30 18:37:19.000000000 +0300
@@ -510,8 +510,8 @@
 #define KEY_TWEN           0x19f
 #define KEY_VIDEOPHONE     0x1a0   /* Media Select Video Phone */
 #define KEY_GAMES          0x1a1   /* Media Select Games */
-#define KEY_ZOOMIN         0x1a2   /* AC Zoom In */
-#define KEY_ZOOMOUT        0x1a3   /* AC Zoom Out */
+#define KEY_ZOOMIN         246     /* AC Zoom In */
+#define KEY_ZOOMOUT        247     /* AC Zoom Out */
 #define KEY_ZOOMRESET      0x1a4   /* AC Zoom */
 #define KEY_WORDPROCESSOR  0x1a5   /* AL Word Processor */
 #define KEY_EDITOR         0x1a6   /* AL Text Editor */
@@ -524,7 +524,7 @@
 #define KEY_ADDRESSBOOK    0x1ad   /* AL Contacts/Address Book */
 #define KEY_MESSENGER      0x1ae   /* AL Instant Messaging */
 #define KEY_DISPLAYTOGGLE  0x1af   /* Turn display (LCD) on and off */
-#define KEY_SPELLCHECK     0x1b0   /* AL Spell Check */
+#define KEY_SPELLCHECK     235     /* AL Spell Check */
 #define KEY_LOGOFF         0x1b1   /* AL Logoff */

 #define KEY_DOLLAR         0x1b2
"

-- 
zoom and calculator keys dont work in my microsoft natural keyboard 4000
https://bugs.launchpad.net/bugs/264287
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