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SubjectRe: Toshiba Satellite 2595XDVD
Date
Hello Andrei

I confirm that I have this same problem on my Toshiba Satellite 4080XCDT,
with Windows 98 on it !
So this is a hardware problem, and Toshiba don't provide a patch or
something even for windows.
In fact I have a lot of other problems with this machine.
USB for example... my webcam sometime has to be unplugged to continue to
work
Same thing for the Kodac DC240 camera....

I have also a ISDN card and if i try to copy something on the diskette, my
communication breaks immediatly...


----- Original Message -----
From: Andrei Pitis <pink@roedu.net>
To: <linux-kernel@vger.rutgers.edu>
Sent: Tuesday, November 30, 1999 6:22 PM
Subject: Toshiba Satellite 2595XDVD


>
> Hi everybody,
>
> I am not sure to whom should I address this, it's about a buggy
> keyboard controller (I guess) found on <subj> laptops that has a
> peculiar behavior with some key sequences. Specifically, when you
> press a shift (ctrl, alt, shift) and a key - (mostly when you play a
> lot with shifts, like in emacs :-)) - sometimes the controller ignores
> the repeat delay and repeats the key, sending very close (tens of
> miliseconds) key_down interrups (kbd MAKEs).
>
> Since this become very frustrating in time (imagine an emacs where
> meta or control sequences get out of hand) I have modified the
> handle_scancode function in drivers/char/keyboard.c to ack like a
> forced kbd delay. In other words, for each new (different from the
> previous one) scancode it sets up a delay (of 200 ms) in which it
> ignores the same scancode, if received within this window.
>
> I think this may as well be left there, I cannot think of things that
> might be broken by it, the second aparition of a scancode being
> always protected by the kdb delay (min 250 ms on PC kbds) - on sane PC
> kbds, at least... therefore the 200 ms does not do any harm to the
> normal kbds :-)
>
> Anyway, I would be grateful if the person in charge (Linus?) would be
> so kind to accept this patch, so I will not be doomed to patch by hand
> each and every kernel from now on :-))
>
> The code is as follows, and should be placed immediately after the
> variable declarations in the abovementioned function:
>
> /*
> * Begin patch for Toshiba Satellite 2595XDVD. Under some
> * circumstances, its keyboards behaves like ignoring the
> * kbd repeat delay. This happens in conjunction with shift
> * keys (ctrl, alt, shift) and leads to undesirable repeat
> * of a key even if pressed briefly. Fix it by ignoring any
> * subsequent occurence of the second identical scancode for
> * 200 ms. IMO, this doesn't break anything on a good keyboard.
> */
> static int prev_scancode = 0;
> static int stop_jiffies = 0;
>
> /* new scancode, trigger delay */
> if (scancode != prev_scancode)
> stop_jiffies = jiffies;
>
> /* same scancode, accept only after the delay */
> else if (jiffies - stop_jiffies >= 20)
> stop_jiffies = 0;
>
> /* glitch! bail out... */
> else
> return;
>
> prev_scancode = scancode;
> /* End Toshiba patch. */
>
>
>
> Thanks!
> --
> Andrei Pitis
> pink@gnu.org
> pink@roedu.net
>
> -
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>


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