Re: [debian-knoppix] toshiba satelite prob: eepro100.o missing, keyboard
Moin Chris!
Chris Liechti schrieb am Monday, den 11. November 2002:
> and there is a _very_ nasty bug in the keyboard handling. every now and then the key appears
> to be pressed twice altough it isn't. "woordss lookk thenn like thhis"
> i don't know what do about that but it makes writing on that machine a challenge...
Recent Toshiba laptops have crappy hardware, ie. a controller which
sends the key events in the wrong order when typing to fast.
Console-tools guys build a filter for this effect so you do not have the
problem on the console, but in X. There is a fix in kernel 2.5, or take
this patch for 2.4.x.
--- drivers/char/keyboard.c.original 2002-10-25 21:19:03.000000000 +0200
+++ drivers/char/keyboard.c 2002-10-25 21:24:20.000000000 +0200
@@ -97,6 +97,9 @@
void compute_shiftstate(void);
+static unsigned char prev_scancode;
+static unsigned char next_scancode;
+
typedef void (*k_hand)(unsigned char value, char up_flag);
typedef void (k_handfn)(unsigned char value, char up_flag);
@@ -213,7 +216,19 @@
}
kbd = kbd_table + fg_console;
if ((raw_mode = (kbd->kbdmode == VC_RAW))) {
- put_queue(scancode | up_flag);
+ /* put_queue(scancode | up_flag); */
+ /* The following 'if' is a workaround for hardware
+ * which sometimes send the key release event twice
+ */
+ unsigned char next_scancode = scancode|up_flag;
+ if (up_flag && next_scancode==prev_scancode) {
+ /* unexpected 2nd release event */
+ } else {
+ prev_scancode=next_scancode;
+ put_queue(next_scancode);
+ }
+
+
/* we do not return yet, because we want to maintain
the key_down array, so that we have the correct
values when finishing RAW mode or when changing VT's */
Gruss/Regards,
Eduard, no longer Toshiba fan.
--
Perfection is achieved not when you have nothing more to add,
but when you have nothing left to take away.
-- Antoine de Saint-Exupéry
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