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Whenever my laptop falls asleep and is woken up (Lenovo Thinkpad X1 Carbon Gen 3), certain applications will no longer run. For example, when trying to launch dmenu or google-chrome-stable (XMonad window manager on Arch Linux), I get this error: Invalid MIT-MAGIC-COOKIE-1.

What does this error mean? I assume it's related to X11. How can I resolve it?

  • That error is indeed related to the X authorization mechanism. An X client needs to present the cookie (a password) to the X server. Normally the cookie is generated when the server starts and stored in a file, either $XAUTHORITY or ~/.Xauthority. Is the variable XAUTHORITY defined in your session? What are examples of applications that keep working? Do any of your dot files (e.g. .bashrc) do anything with XAUTHORITY or ~/.Xauthority or the xauth command? – Gilles Aug 1 '15 at 21:54
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Either your cookie file $XAUTHORITY is getting cleaned up, or maybe your machine name is changing (some aggressive dhcp settings?) so that the wrong thing is getting looked up. Things to check:

  • Run xauth info and echo $XAUTHORITY to see if your file is someplace that might get cleaned up (like /tmp).

  • Run xauth list > xauth.working, then sleep your laptop, then run xauth list > xauth.broken. Then run diff -u xauth.working xauth.broken to see if anything is changing in your cookie file.

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