Re: 2.6.0_test6: CONFIG_I8K produces wrong/no keycodes for special buttons

[Massimo Dal Zotto]

> There are 4 special buttons on dell-laptops which you could only get to 
> work using CONFIG_I8K. This worked well in any 2.4-kernel, by pressing 
> these buttons the keycodes 129. 130, 131, 132 get produced. In 
> 2.6.0-test6_mm2 it produces <nothing>, 162, <nothing>, 110. I've digged 
> into the code without any succes for now. Any hints?
> 
> Thx,
> Jan
> 
> PS: Beside that i've also problems to get some of my pcmcia-cards runnig 
> (ISDN and WLAN). May someone point me to any URL getting more 
> information concerning the new ISDN-TTY-Interface in kernel-2.6?
> 

This is not entirely correct, you don't need the driver for all buttons.

The inspiron 8000 has 4 multimedia buttons, 2 volume buttons and 3 Fn-key
combinations. Other Dell laptops have only one or two buttons.

The multimedia buttons generate the following raw scancodes which can be
dumped with showkey -s:

    0xe0 0x01	play
    0xe0 0x02	stop
    0xe0 0x03	back
    0xe0 0x04	forward

Since the raw scancodes are generate by the keyboard like any other key
they should be handled by the 2.6.0 kernel as in 2.4.x. If this doesn't
work it is a bug in the kernel. Did you try showkey -s with 2.6.0?

Under X-window these 4 keys generate the following keycodes which can be
mapped to any keysym with xmodmap:

    129  	play
    130  	stop
    131  	back
    132  	forward

These are defined in /etc/X11/xkb/keycodes/xfree86 as <I01>, <I02>, etc.:

    <XFER> =   129;		// Henkan
    <NFER> =   131;		// Muhenkan
    alias <XFER> = <I01>;
    <I02>  =   130;
    alias <NFER> = <I03>;
    <I04>  =   132;

but it is not clear to me where the raw keyboard scancodes are mapped to
the xfree86 keys <I01>, <I02>, etc.

For some obscure reason known only to Dell the volume buttons and the Fn-
keys are trapped by the SMM BIOS and can be read only by the i8k driver
which under kernel 2.4.x can be programmed to generate the original raw
scancodes generated by the keyboard:

    0xe0 0x20	fn+vol_mute
    0xe0 0x2e	vol_up, fn+vol_down
    0xe0 0x30	vol_up, Fn+vol_up

(SMM BIOS can be programmed to handle volume buttons as normal keys
by disabling the Fn- key but then you don't have the Fn- function,
including bios access and suspend)

Unfortunately the keyboard interface has changed in 2.6.0 and it is not
possible to generate the 0xe0, 0x0N sequence as in 2.4.x, so this feature
has been disabled and you must use i8kbuttons instead. If anybody knows
how to generate the corresponding scancodes in kernel 2.6.0 please let
me know.

-- 
echo 16i[q]sa[ln0=aln56%1F+Pln56/snlbx]sb23C15C85417484EC5E429FD9776Asnlbx|dc;\
echo 16i[APq]sa[ln0=aln5C%1F+Pln5C/snlbx]sb72E28557F7FE184112F53F5FFDsnlbx|dc
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