problem with usb duo mouse and keyboard

From: Raul Miller (moth_at_magenta.com)
Date: 12/21/03

  • Next message: Mika Penttilä: "Re: [PATCH] loop.c patches, take two" 
    Date:	Sun, 21 Dec 2003 15:43:31 -0500
To: linux-kernel@vger.kernel.org

    Linux 2.6.0 (and 2.6.0-test11) appears to have a significant problem
    with the mouse of the logitech 700mx duo when it's plugged in using usb.

    The mouse works fine* when plugged in using the ps/2 mouse connector,
    and the keyboard works ok even when plugged in using usb. However,
    when using usb:

    o horizontal mouse movement is interpreted as vertical movement
    o vertical mouse movement is ignored
    o strange things happen with mouse button presses (I didn't bother
        working with this configuration long enough to figure out the
        details).

    This occurs under both x and gpm, which is mild evidence that it's
    not a user space problem.

    It might also be worth noting that some of the extra keys on the keyboard
    do odd mouse-like things (like move the mouse's pointer horizontally
    a short distance) when it's a usb keyboard. However, these keys work
    reasonably normally (or, in two cases**, generate entries in syslog)
    when it's plugged in as a ps/2 keyboard.

    My guess is that the respective usb drivers haven't taken into account
    that both a keyboard and a mouse might appear on the same physical
    connection. [But I'm still coming up to speed, and haven't yet figured
    out how to confirm/disprove that guess.] 

    -- 
Raul Miller
moth@magenta.com
* one mouse button is ignored, however it is so awkwardly placed that I
doubt anyone would want to use it.
** the syslog entries from the unsupported keys:
Dec 21 15:28:07 localhost kernel: atkbd.c: Unknown key pressed (translated set 2, code 0x11d, data 0x11, on isa0060/serio0).
Dec 21 15:28:07 localhost kernel: atkbd.c: Unknown key released (translated set
2, code 0x11d, data 0x91, on isa0060/serio0).
Dec 21 15:28:10 localhost kernel: atkbd.c: Unknown key pressed (translated set 2, code 0x12c, data 0x14, on isa0060/serio0).
Dec 21 15:28:10 localhost kernel: atkbd.c: Unknown key released (translated set
2, code 0x12c, data 0x94, on isa0060/serio0).
Perhaps it's also worth noting that most of the other extra keys send two
byte sequences when pressed (as reported by showkey -s), and showkey -k
seems to be reporting the extra information as extra key releases, I think
I've seen something similar on other keyboards, but I don't have one of
those handy to test on).  If anyone cares, I can document this for them.
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