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Ps2 vs USB for Logitech Optical Mouse
- Thread starter arod
- Start date
Don't USB port use up more CPU load than PS/2 port? I think it's about 3 to 4% of load. I heard if you want to use USB, might better off get rid of PS/2 port for something else, such as IRQ or something.
I am not sure if it's true of not, can anybody confirm this? I was in the same situation as you do, then somehow I came cross some article mention something about this. I think they did some kind of benchmark on this. Maybe you can do it yourself and see. 🙂
I am not sure if it's true of not, can anybody confirm this? I was in the same situation as you do, then somehow I came cross some article mention something about this. I think they did some kind of benchmark on this. Maybe you can do it yourself and see. 🙂
Hi,
Since this is a notebook, you need to consider the features of the BIOS and the built-in pointing device when you make this decision. Also, your OS will come into play.
Consider this: Windows doesn't really seem to like allowing you to have the advanced features for two widely different pointing devices installed in the same hardware profile. There are exceptions to this rule, I'm sure, but you usually don't see a Synaptics Touchpad with all of its advanced functions intact working on the same system simultaneously with an external PS/2 mouse, for instance. This can be a major pain in the butt because the advanced functions of the touchpad must be enabled to suppress the click-on-tap function. There you are trying to use your external mouse and your keyboard, and every time you start typing the system acts like you are clicking the left mouse button. (You may not even be touching the touchpad. Sometimes just the proximity of your hand to the touchpad is enough to cause a click, or cursor movement.)
There are a couple of ways around this, and I've seen mixed to good results with each method. To figure out what your choices are, you're going to need to examine the system carefully.
1. Which built-in pointer does your notebook have, and which external pointing devices are you considering? Some driver sets may get along better with each other than do others.
2. What provision does your BIOS setup have for determining pointing device selection? The possibilities are: disable, auto-enable (or auto-disable, depending on point of view), enabled. If the BIOS allows you to disable the internal pointing device, and you just don't want to use it at all, the "disable" choice will enable you to just use the external device and never worry about the built-in device. In this case you're golden with either PS/2 or USB external pointers. If you wish to be able to use the internal device when traveling but an external device when you're at a desk or table, you might choose the auto-enable/disable choice. The only problem with this one is that it won't work with a USB external device, at least on any systems I've seen yet. To this point in time the only auto-enable/disable pointer BIOS provision I've seen working is designed to disable the internal pointer when it detects a pointing device on the PS/2 port. So, if you want to alternate the use of both types of pointing devices in a single hardware profile, you should probably stick with a PS/2 external pointing device. Remember that you should NOT plug or unplug a PS/2 mouse with the system powered up. You should also be aware that if you suspend-to-RAM (standby) or suspend-to-Disk (hibernate) and then plug or unplug the PS/2 mouse, when you bring the computer out of standby / hibernate, you probably won't have a properly functioning pointing device. When changing between internal and PS/2-connected pointing devices, you need a reboot.
3. If you want to use just the standard settings with no advanced capabilities on the internal pointing device, and if you want to be able to hot plug your external pointing device, choosing on the spur of the moment which device to use, your choice would probably be to set the BIOS to enabled and use the USB device. (Do remember that you should use the eject icon in Systray to prepare the USB pointing device to be ejected before you remove it from the USB connector.) Depending on the characteristics of the internal pointing device, this scenario can work out pretty well. But if the internal device is overly sensitive in its "standard" state, then this is going to be a tough combination to use. As internal devices go, pointing sticks are usually going to co-exist with an external USB mouse more easily than touchpads.
4. You might try using alternate hardware profiles to deal with the matter. I'm an adapt-to-the-equipment sort of guy, so I've never cared enough about having alternate pointing devices to experiment with this one.
Hope this is helpful.
Regards,
Jim
Since this is a notebook, you need to consider the features of the BIOS and the built-in pointing device when you make this decision. Also, your OS will come into play.
Consider this: Windows doesn't really seem to like allowing you to have the advanced features for two widely different pointing devices installed in the same hardware profile. There are exceptions to this rule, I'm sure, but you usually don't see a Synaptics Touchpad with all of its advanced functions intact working on the same system simultaneously with an external PS/2 mouse, for instance. This can be a major pain in the butt because the advanced functions of the touchpad must be enabled to suppress the click-on-tap function. There you are trying to use your external mouse and your keyboard, and every time you start typing the system acts like you are clicking the left mouse button. (You may not even be touching the touchpad. Sometimes just the proximity of your hand to the touchpad is enough to cause a click, or cursor movement.)
There are a couple of ways around this, and I've seen mixed to good results with each method. To figure out what your choices are, you're going to need to examine the system carefully.
1. Which built-in pointer does your notebook have, and which external pointing devices are you considering? Some driver sets may get along better with each other than do others.
2. What provision does your BIOS setup have for determining pointing device selection? The possibilities are: disable, auto-enable (or auto-disable, depending on point of view), enabled. If the BIOS allows you to disable the internal pointing device, and you just don't want to use it at all, the "disable" choice will enable you to just use the external device and never worry about the built-in device. In this case you're golden with either PS/2 or USB external pointers. If you wish to be able to use the internal device when traveling but an external device when you're at a desk or table, you might choose the auto-enable/disable choice. The only problem with this one is that it won't work with a USB external device, at least on any systems I've seen yet. To this point in time the only auto-enable/disable pointer BIOS provision I've seen working is designed to disable the internal pointer when it detects a pointing device on the PS/2 port. So, if you want to alternate the use of both types of pointing devices in a single hardware profile, you should probably stick with a PS/2 external pointing device. Remember that you should NOT plug or unplug a PS/2 mouse with the system powered up. You should also be aware that if you suspend-to-RAM (standby) or suspend-to-Disk (hibernate) and then plug or unplug the PS/2 mouse, when you bring the computer out of standby / hibernate, you probably won't have a properly functioning pointing device. When changing between internal and PS/2-connected pointing devices, you need a reboot.
3. If you want to use just the standard settings with no advanced capabilities on the internal pointing device, and if you want to be able to hot plug your external pointing device, choosing on the spur of the moment which device to use, your choice would probably be to set the BIOS to enabled and use the USB device. (Do remember that you should use the eject icon in Systray to prepare the USB pointing device to be ejected before you remove it from the USB connector.) Depending on the characteristics of the internal pointing device, this scenario can work out pretty well. But if the internal device is overly sensitive in its "standard" state, then this is going to be a tough combination to use. As internal devices go, pointing sticks are usually going to co-exist with an external USB mouse more easily than touchpads.
4. You might try using alternate hardware profiles to deal with the matter. I'm an adapt-to-the-equipment sort of guy, so I've never cared enough about having alternate pointing devices to experiment with this one.
Hope this is helpful.
Regards,
Jim
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