Can't switch between ChromeOS and XFCE about crouton HOT 3 CLOSED

Crouton on ARM works a little bit differently due to inability to share video ram properly (as you said, the TTYs behave differently), but the workaround is already built-in.
Use Ctrl+Alt+SHIFT+Forward/Back to cycle through the available chroots on that platform (or if you manually used the xephyr target on non-ARM platforms).

The nitty-gritty is that instead of launching an independent X server, we nest one inside of ChromeOS's, and use the ratpoison window manager with a custom config to manage the windows.

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Thanks for that. Is there further documentation somewhere?

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Not yet! This is still pretty new. When you first create the chroot it spits out a couple tips based on the targets you've chosen. I've also pushed an update to the README for the ARM keyboard shortcut discrepancy.

If you have any questions, feel free to open more bugs and I'll document them!

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