Re: [linux-dell-laptops] Re: external keyboard/mouse kills built-in touchpad, am I the only one
- Anyone know how to change the (usb) mouse speed in Red Hat/Mandrake?
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----- Original Message -----
From: Peter Mxller Neergaard <peter@...>
Cc: kev0153 <kclark@...>
Sent: Friday, March 01, 2002 4:41 AM
Subject: Re: [linux-dell-laptops] Re: external keyboard/mouse kills built-in
touchpad, am I the only one
> On March 1, 2002, Kevin wrote:
> K> Is it a USB mouse and or keyboar. If so here is a pretty good page
> K> for configuring such items.
> K> http://www.linux-usb.org/USB-guide/x194.html
> Thanks. I have already been over that page.
> The problem is not getting the keyboard or the mouse to work (be it as
> USB or on PS/2) par se---I can get everything up and running when I
> boot the machine with the devices plugin.
> The problem is that with the computer being a laptop, I would like to
> be able to unplug and replug the devices w/o having to reboot the
> machine and preferable also without restarting the X server.
> So far I have tried the following which in all cases have their
> various problems:
> - extern mouse or keyboard on the PS/2 port in tty. The keyboard
> works fine, but when I plug in anything on the PS/2 port, Linux's
> mouse device, /dev/psaux dies.
> More precisely, I tried the following
> 1) cat /dev/psaux in a pure tty shell
> 2) moving around on the touchpad will produce some random garbage as
> output from cat
> 3) plug in a PS/2 keyboard or mouse
> 4) moving around on the touchpad produces no output. Likewise with
> the mouse
> So somehow the part of the kernel handling the mouse (the module
> mousedev??) must have gotten severely confused and have stopped
> working. I have tested this both with the old device system and
> with a devfs file system.
> 2) extern keyboard or mouse on PS/2 port under X. Same behavior as
> above: after plugging in the extern mouse, neither the touchpad nor
> the extern mouse will move the pointer.
> In this case, I can get the mouse pointer to work, by restarting
> the X server. This is unfortunate since it kills my current
> 3) extern keyboard or mouse on USB under tty and X. Plugging in any
> device on a port makes it work. I have to admit that I at that
> point was impressed by the USB subsystem for its out-of-the-box
> The disadvantage is that my Inspiron only has one USB port so I'll
> need a USB hub if want both an external mouse and keyboard.
> (Plugging the keyboard into the PS/2 port is not an option since
> it, as outlined above, triggers the /dev/psaux to die.
> 4) extern mouse and keyboard on an APR in the PS/2 behavior under X
> and tty. Same behavior as under 1) and 2), i.e., putting the
> laptop in the APR makes /dev/psaux (or consequently any mouse
> service) die.
> 5) extern mouse and keyboard on an APR in the two USB ports on the
> APR. To work, this requires the laptop to be booted in the APR.
> Otherwise the USB system will still only recognize the one port built
> to the Inspiron after plugging the laptop into the APR and after
> shutting down and restarting the system.
> And with the setup I cannot succesfully remove the laptop and then
> plug it back in later. I have tried the following
> 1) shut down USB
> 2) unplug it from the APR
> 3) work unplugged for a while
> 4) plug back into the APR
> 5) start the USB system again.
> The mouse and keyboard will not work, but my kernel log is filled
> with the following warnings:
> Feb 28 18:14:41 pan kernel: usb-uhci.c: Host controller halted, trying
> Feb 28 18:14:42 pan last message repeated 35 times
> Feb 28 18:14:42 pan kernel: hub.c: Cannot enable port 1 of hub 1,
> Feb 28 18:14:42 pan kernel: hub.c: Maybe the USB cable is bad?
> Feb 28 18:14:42 pan kernel: usb-uhci.c: Host controller halted, trying
> Feb 28 18:14:43 pan last message repeated 199 times
> Feb 28 18:14:43 pan kernel: hub.c: Cannot enable port 2 of hub 1,
> So in all of the setups except just using the Inspiron's built in USB
> port I experience problem. Now all of this could be a bug in my
> particular hardware, a general problem of Dell laptops, or a bug in
> the Linux kernel. Since I only have one Dell laptop, I don't have any
> chance to rule out which of the three possibilities it is. And that
> it's why I am extremely curious on other people's experience. So I
> would appreciate if you (and other) would spend 5 minutes on trying
> one of the options.
> So at this point, I'm about to draw the conclusion that the best
> ``APR'' is buying a USB hub and stick to solution 3. Since I have a
> wireless card, I need only plug in the USB hub and a monitor and then
> I'll be connected.
> K> If not maybe check the BIOS. Going from memory as I am not in
> K> front of my laptop, but isn't there a page on configuring ps/2
> K> port. Not sure.
> I could find two options in my BIOS (Inspiron 4100, A04)>
> - ``USB legacy'' which supposedly enables USB keyboards on older legacy
> systems without a USB driver. I presume it could mean yet another
> mapping to the PS/2 port. Anyways, it didn't make any difference
> whether it was enabled or not.
> - ``pointing device'' where I can choose whether an external keyboard
> mouse overwrites the touchpad. There were no difference in
> behavior with the two options here.
> ``When you have had all the experiences, met all the famous people,
> made some money, toured the world and got all the acclaim you still
> think--is that it? Some might be satisfied--but I wasn't'' -- G. Harrison
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- Are you hot-plugging the PS2 stuff? PS2 stuff does NOT support hot
plugging, at least not as far as I know. In fact, I have known people
who fried their PS2 connectors doing that and were forced to use USB
mouse/keyboard because of it.
If you boot Windows 98 and it doesn't detect a mouse, it tells you
that if you have a USB mouse, go ahead and plug it in, but if you
have a PS2 mouse, power down the computer before you attach it. I
have seen this message many times while building systems.
> OK, of course it's a little bit odd being the only one replying to my--
> own thread, but I got a little closer to understand the problem today.
> On February 28, 2002, I wrote:
> PMN> - extern mouse or keyboard on the PS/2 port in tty. The keyboard
> PMN> works fine, but when I plug in anything on the PS/2 port,
> PMN> Linux's mouse device, /dev/psaux dies.
> I got hold on a stash of PS/2 keyboards today. Plugging and
> unplugging worked fine with all those keyboards.
> So my conclusion is that this is a problem that is particular to my
> external keyboard which is a Logitech Cordless Desktop Pro. Some
> local Linux expert told me that it indeed was a known issue that Linux
> could have trouble with hotplugging of cordless devices due to longer
> response times from the keyboard.
> Guess, I'll have to see how Windoze handles this and then consider
> bugging Logitech, Dell, or both.
mailto: `echo NjsOc3@... | sed 's/[NOSPAM]//g'`
On March 1, 2002, John Cronin wrote:
j> Are you hot-plugging the PS2 stuff? PS2 stuff does NOT support hot
j> plugging, at least not as far as I know. In fact, I have known
j> people who fried their PS2 connectors doing that and were forced to
j> use USB mouse/keyboard because of it.
You are correct, I am hotplugging the PS/2 stuff. From what I've been
told, laptops are equipped with an electronic buffer that should make
it safe to hotplug even PS/2 stuff. So what you say should only be
true for desktop.
I tried searching Dell's support page for information about using an
extern keyboard, but could not find any details on plugging . But
since the laptop behaved similarly under Windoze, I have now put this
problem down as a an incident with Dell, I suppose they'll me what is
safe and not.
``When you have had all the experiences, met all the famous people,
made some money, toured the world and got all the acclaim you still
think--is that it? Some might be satisfied--but I wasn't'' -- G. Harrison