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11012
April 22nd, 2006 17:00
D610 port replicator USB problem
First of all, since I'm new here, greets to everyone here. Now to the problem...
I have a latitude D610 and a D/Port Advanced Port Replicator. When I plug my USB logitech optical mouse to the laptops USB port, the mouse operates at 125hz like usb mice are supposed to, but when I plug the mouse to the port replicator USB port, the mouse operates at only 62hz. Any suggestions how to fix that?
I ask since I also have an external USB Soundblaster live 24-bit sound card that has lag problems when running off of APR. Any help greatly appreciated.
I have a latitude D610 and a D/Port Advanced Port Replicator. When I plug my USB logitech optical mouse to the laptops USB port, the mouse operates at 125hz like usb mice are supposed to, but when I plug the mouse to the port replicator USB port, the mouse operates at only 62hz. Any suggestions how to fix that?
I ask since I also have an external USB Soundblaster live 24-bit sound card that has lag problems when running off of APR. Any help greatly appreciated.
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Timerider
26 Posts
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April 25th, 2006 14:00
Message Edited by Timerider on 04-25-200610:11 AM
Timerider
26 Posts
0
April 25th, 2006 14:00
Message Edited by Timerider on 04-25-200611:18 AM
px610
2 Posts
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April 26th, 2006 16:00
I monitored the refresh with a tiny utility called mouse rate checker. You can get it from here, it's only 8kb:
http://tscherwitschke.de/mouseratechecker.html
And an update on my original problem.
I already had updated the bios and all the drivers. As it turns out, the problems lies in the fact that USB 1.1 devices need to connect to a USB controller directly, not through a hub. Or at least not trough a USB 2.0 hub. A USB 2.0 hub needs to transform the signal somehow to meet the 1.1 USB device and that creates lag. And I guess this is the reason why my USB 1.1 mouse has only half the refresh rate plugged through the port replicator and also the cause why my USB 1.1 sound card lags.
So the possible solutions for me is to plug the mouse direclty to the laptop or use a USB 2.0 mouse in which case the (USB 2.0) D/port wouldn't cause any issuses, since they would both use the same protocol.
In other words: when you have a D610 with D/port only use USB 2.0 devices. Should save you from some headache (I haven't tested this yet with many devices, but from what it seems, USB 2.0 devices shouldn't have these problems with D/port).
Happy problem solving.
Message Edited by px610 on 04-26-200612:48 PM