ACPI Toshiba - character ^[[B

[Kojot89]

I tried to run Ubuntu 9.04 and Ubuntu 9.10 on Toshiba F30-140, but I have problem with ACPI. With GRUB option acpi=off system starts normally, only with acpi working I can't boot my system. During startup character ^[[B appears continously in console (a few characters per second) and terminate all important processes (fsck, mount), that system don't works properly.
I want to locate source of that echoing and disable it, but I don't know how to do it.
I will be grateful for every clue.

[Rubberman]

ACPI doesn't work on some systems unless you have properly enabled it in their bios, and sometimes not even then. I've had this problem on some tablet pc's. So, boot with the acpi=off option for now.

[Kojot89]

With acpi=off I don't have access to power saving options (like dynamic cpu frequency or lcd brightness), which are important for me.
System was working before BIOS update, but I had to update, because my new battery require it.

EDIT:
I've spoted that character starts appearing after report that USB controllers were loaded. I tried to disable some additional options in BIOS, but nothing happend. Maybe I missed something, so will join screens of my BIOS.
I was trying to change these options:
USB KB/MOUSE Legacy Emulation
USB-FDD Legacy Emulation
USB Memory BIOS Suport Type
but no results.

[Rubberman]

If this started after reflashing the BIOS, then I think there may be a problem with the new BIOS. I presume you have this problem with the built-in keyboard, and are not using an external USB keyboard? Have you tried a live CD/DVD for another OS, such as Fedora or such to verify that this problem isn't specific to Ubuntu?

[Kojot89]

Yes, I use built-in keyboard. Do you think keyboard is source of that problem?
I've also tried OpenSuse 11.1 and Mandriva One 2009 and there is the same problem.

[Rubberman]

Yes, I use built-in keyboard. Do you think keyboard is source of that problem?
I've also tried OpenSuse 11.1 and Mandriva One 2009 and there is the same problem.

Since you are using the built-in keyboard (it's not likely a USB device) I don't think that is the problem, unless you have a stuck key (a function key would be likely from the string being displayed). Anyway, since you get the same problem with other distributions, then it has to be a hardware problem or a bios upgrade problem. Are you sure you installed the correct bios upgrade for your system?

[Kojot89]

I'm sure I've done correct bios update.
I forget to tell, that Windows works OK.
A moment ago Ubuntu LiveCD started with ACPI, of course during boot character was being displayed in console, but after GNOME started I couldn't see it. After login I tried to use Display brightness changing and CPU frequency changing and it worked correct. When I switched to other tty, character appeared again and it started turning on that annoying system beep.
OpenSuse started in quiet mode didn't displayed character, but character is being emited, because I got errors, that some processes were terminated because backspace key was pressed.

[Rubberman]

The keycode you indicate is a repeating function key of some sort. I'm not sure which one equates to Esc-bracket-B. I'll have to look up my old ANSI/VT-100 terminal books to see. In any case, either a function key is stuck, the hardware is "glitching", or the bios upgrade is buggy. Windows can mask a lot of problems like this. I know that on my Dell laptops simple low-level static from lightly touching the case with the heels of my hands, as often happens when you type, will cause the system to register a mouse button click - although it happens with Windoze as well as Linux.

[Rubberman]

Ok. Did some checking. This code is the Cursor-Down key code. Why the system keeps generating it is the question.

[Kojot89]

I didn't know how to find meaning of keycode. If you say that is ANSI/VT-100 it means that

[

is the value of "move cursor down". Am I right?
But there is still no answer for - why the keycode is being generated.
And I've got one more question - why the keycode affect only tty, where the system works and is not passed to the X window system?
By the way, thanks for help in contriving.