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My Mac has Emacs v22 and it only splits horizontally when I type ^x-2.

My Linux system has Emacs v24 and it splits vertically when Emacs thinks that's a better choice. The problem is, I don't want it to split that way. How do I prevent emacs from splitting vertically?

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Odd as the manual shows C-x 2 (split-window-below). Look in the .emacs settings file or the customization interface and check if this has been re-assigned to split-window-right. – Brian Jul 18 '13 at 1:58
Type C-h k C-x 2. Is the key properly set to split-window-below? – user235731 Jul 18 '13 at 9:58
The problem seems to show up with grep, compile, goto next error, and gdb commands. – vy32 Jul 19 '13 at 2:33
up vote 4 down vote accepted

See the Emacs manual, node Window Choice. In particular, see user options split-height-threshold and split-width-threshold.

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For splitting horizontally use C-x 3. You can find more options here.

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