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What parameters do I have to set in /etc/default/grub in order to boot by default in 132x50 and verbose.

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For verbose, I think you simply need to take "quiet" out as a boot option; I don't know if that's done in /etc/default/grub or the scripts in /etc/grub.d. –  zpletan Apr 3 '12 at 15:09
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One of the most authentic sources on kernel parameters can be found in the kernel tree under the name Documentation/kernel-parameters.txt, an online version can be found at the GitHub mirror of Linux.

  • Verbosity can be controlled by the quiet parameter, removing it will increase verbosity.
  • The resolution can be set with the vga parameter, possible values are documented in the TLDP framebuffer HOWTO. For example, if you'd like the boot resolution to be 1024x768 with 24 bits color depth, the parameter should be set like vga=0x318. The actual character count can be determined by taking the kernel font size into account.
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I used two parameters in /etc/default/grub:

# The resolution used on graphical terminal
# note that you can use only modes which your graphic card supports via VBE
# you can see them in real GRUB with the command `vbeinfo'
GRUB_GFXMODE=1366x768x24
# bug workaround
GRUB_GFXPAYLOAD_LINUX=keep

I found the second item by reading the shell scripts in /etc/grub.d.

Be sure to "set pager=1" before running vbeinfo so you can read the output.

Be sure to run "sudo update-grub" when you are done

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