Re: Keyboard Scancode Problems

From: Stefan Frank (
Date: Fri Feb 02 2001 - 02:11:53 EST

Hi Udo!

On Thu, 01 Feb 2001, Udo A. Steinberg wrote:

> Hi all,
> With all the latest kernels (at least since 2.4.0-test12)
> I have had occasional problems with a PS/2 keyboard when
> switching back and forth between X and text consoles.
> In most cases the problem occurs when switching from X to
> a text console, which renders the keyboard totally unusable.
> Pressing any key results in ^W ^E and other garbage.
> Sometimes pressing Ctrl fixes the problem, other times not
> even SysRq works.
> The kernel logs the following stuff:
> keyboard: unrecognized scancode (70) - ignored
> keyboard: unrecognized scancode (66) - ignored
> keyboard: unknown scancode e0 71
> keyboard: unknown scancode e0 70
> and so forth. I cannot reliably reproduce it though.
> Can someone enlighten me whether this is a keyboard problem,
> X problem or something wrong with the kernel's console stuff?

I had the same problem when upgrading from 2.4.0-test10 to 2.4.0,
altough my keyboard worked for about half a year without problems.
But, what a coincidence, it turned out to be a hardware problem. Two pins
of the PS/2 connector were moved inside the connector, thus they didn't
connect to the keyboard controller. I replaced the keyboard cable and
all is well. Did you try to replace the keyboard ?

Regards, Stefan

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