Lost keypresses and mouse clicks: Hardware problem?
I recently bought an Intel MBP, and I've been noticing strange behaviors with regard to keypresses and mouse (touchpad) clicks getting lost sometimes. The problems I'm having are hard to reproduce intentionally, but I can hear the keypresses and mouse button clicks when I do them, yet nothing happens. While it's possible, that I sometimes am hitting the wrong key, I have been paying closer attention lately to this problem, and of course, the mouse button kinda hard to hit incorrectly. Here are some examples of weird things I encounter:
If I click in a text field in Safari, sometimes the first keypress (and only the first) will get lost.
Sometimes, the first keypress I type right after clicking gets lost. For instance, just now, I noticed a typo in the above sentence, so I clicked on the character and hit the Delete key. The cursor was in the right place, but the delete didn't happen. I had to press the key again.
Sometimes, even when the window for sure has focus and the pointer is squarely pointing to a link, the first click on the link won't take. I have to click it again. Since Safari doesn't have adequate feedback for when you click something, that can get particularly frustrating. Similar things happen with buttons in applications or on the title bar.
If I'm using an X11 app, and I copy/paste with the clipboard, the touchpad won't respond to movement for 2 or 3 seconds afterward. This is particularly visible with "nedit". I don't think this is an "ignore accidental touchpad input" issue, because this only happens with clipboard actions; other keys don't have this effect. I haven't noticed this with native apps.
However, I have noticed in X11 and native apps, sometimes, Ctrl/Cmd-C and Ctrl/Cmd-V will be ignored. They're never ignored if I selected the text using the keyboard (shift+arrows), but if I select the text with the mouse and then use the shortcut to copy, the copy/paste sometimes doesn't happen.
I have noticed that if I am more deliberate about clicks (make sure to hold the button down longer), the probability of losing the event SEEMS to be reduced, but not eliminated. Is there a debounce circuit involved that's causing me trouble?
This kind of loss of input is unusual to me. I have a number of Windows and Linux PCs, and I've never experienced this sort of thing. I've also used a few Macs at school before I got this one and didn't notice anything weird.
Can anyone shed some light on this for me? It would seem odd that I should have to modify my keyboard/mouse using behavior when switching to the Mac. If the problem is hardware, how can I prove it? (Perhaps I could boot Knoppix from a CD and mess around a bit.) If the problem is software, is this a case of MacOS trying to second-guess user input?
Thanks!
Theosib,
Apple regularly monitors these boards, but you may never see a response from Apple directly. Assume this is a user to user forum. If you are having a problem with the computer and need a response from Apple call 1-800-APLCARE and speak to customer relations at that office if the technician is not able to satisfy your needs.
Your problem while not unheard of, is more uncommon than the boards may make you believe.
Remember, Spotlight is constantly indexing. If your hard drive is overfull, it may take longer for Spotlight to index, thus cause a multitasking delay. If you have many Dashboard widgets, they may all be trying to access the net for updates at once, and again, a delay might happen. I've written a FAQ* about several other factors which may affect Mac OS X speed, which could in theory also affect keyboard input:
http://www.macmaps.com/Macosxspeed.html
And of course, you should always check Apple menu -> System Preferences -> Keyboard and Mouse to make sure your input settings are the ones most comfortable for you when using the keyboard. It is possible a repeat rate could cause a delay.
Edit: I attempted to answer another of your questions here recently with an update:
http://discussions.apple.com/click.jspa?searchID=-1&messageID=3988468
Please take a look and see if it answers your question.
* Links to my FAQs may give me some compensation.
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desktoptheme - Desktop Theme
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kcm_kscreen - Manage and configure monitors and displays
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kcm_pci - PCI information
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kcmtrash - Configure trash settings
kcmusb - USB devices attached to this computer
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kwindecoration - Look and Feel of Window Titles
kwinoptions - Window Actions and Behavior
kwinrules - Individual Window Behavior
kwinscreenedges - Active Screen Corners and Edges
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opengl - OpenGL information
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powerdevilprofilesconfig - Energy Saving
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scsi - SCSI information
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solid-actions - Manage actions available to the user when connecting new devices
spellchecking - Spell Checker Dictionaries and Options
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style - Widget Style and Behavior
translations - No description available
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wayland - Information about the Wayland Compositor
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