[nos-bbs] another gotcha

Bob Tenty bobtenty at gmail.com
Sat Dec 5 08:56:18 EST 2009

Hi John,

You described it for the new grub2, most likely a new install of Ubuntu 9.10

Below is for those with the old grub.

I upgraded from Ubuntu 9.04 to Ubuntu 9.10  from the shell and it is 
still using the old
grub with the familiar /boot/grub/menu.lst file in that case.

With the old familiar grub  no /etc/default/grub file is installed.

I just added  it to the end of  my  existing last line starting  with "kopt"
in the  /boot/grub/menu.lst  file  under ## ## Start Default Options ##

like in my case

# kopt_2_6=root=/dev/mapper/linux-root ro pty.legacy_count=64

(this gives ptyp0 -ptysf/ttyp0-ptysf)

(Above is also valid for Ubuntu 9.04)

No need to  disable SMP if you have only a single core processor in your 
The kernel senses the number of cores and switches SMP off in that case.
This  is recorded in "dmesg" and in the log.



ve1jot wrote:
> Also, until the ax25 stuff is caught up, kernel "SMP" needs to be 
> disabled...sorry, forgot that one...
> For Ubuntu users to create pty's:
> in /etc/default/grub, add "pty.legacy_count=10 nosmp" to the line that 
> starts with:
> don't forget to run the command "update-grub" after editing this file 
> to parse it in. If you're
> successful you will see /dev/pty0 to /dev/pty9 now (after a reboot)
> HTH and merry ho-ho!
> 73,
> John
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