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Old 05-25-2011, 09:12 PM   #16
segmentation_fault
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Just did the same test.

pPPPPPPPPPpPPPpPpPpPpPpPpPpPpPPPpPPPPPpP

And I am using a Microsoft Comfort Curve wired USB keyboard...
 
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Old 05-25-2011, 09:50 PM   #17
Telengard
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So here's what I think OP is doing. Suppose I want to type my name:

CAPSLOCK - T - CAPSLOCK - e - l - e - n - g - a - r - d

I just wrote this entire message this way. I am a touch typist, though not a very fast one.

And I did not experience the bug described here. I have had stuck keys before, but that's a little different from what I think OP is describing.

Last edited by Telengard; 05-25-2011 at 09:51 PM.
 
Old 05-25-2011, 10:09 PM   #18
segmentation_fault
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Yes but do that test yourself. Strike CAPS and a letter key alternatively really fast. You can see the caps led blinking but the input sticks on uppercase...
Strange evil machines...
 
Old 05-25-2011, 10:40 PM   #19
Hevithan
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I think the problem is that the OP is using caps to act as shift, and when after typing the first letter it just stays on for a sec, even after it is turned off.

If this is the case, The most simple solution would be: just use shift for it's intended purpose. To capitalize when needed. and caps for it's purpose, TO BE ABLE TO WRITE A SENTENCE AND NOT HAVE TO HOLD SHIFT.

Pretty basic, yeah?
 
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Old 08-10-2011, 01:31 PM   #20
Medeoker
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Hey everyone,

I use this site as a resource of information many times, but I figured I would register an account to reply to this thread.

I have this issue as well. I've experienced this across many different flavors of Linux and on a Wyse terminal (not sure what OS Wyse was running back in the day).

I do believe it is an issue. Sorry to disagree with some of you all. The problem is that the OS does not detect the keystroke fast enough when turning CAPS Lock off. As soon as I type the letter 't' I see it on the screen that quick. I don't feel I get that same sort of response time when hitting the caps lock key.
How I type (using the CAPS lock key, or a shift key) doesn't really matter, because the issue still would exist. For those of you who say the CAPS lock key is around just to type long strings together in caps "HERE IS MY EXAMPLE", you would still experience the issue if you typed fast enough.

I REGISTERED FOR AN ACCOUNT Just to make this post. - The 'J' in that sentence should have been lower case, but because of the delayed CAPS lock key time, it came out as a capital letter instead.

I've been typing using the CAPS lock key for years. I can type 120wpm or so. I'm not interested in learning to use the shift key just because, or because I could then type faster. As others have mentioned, this isn't an issue within a Windows OS. I'm not saying that to compare Linux to Windows, just making an observation.

The only time this issue really irritates me is when I'm setting a password with capital letters in it and it's masked. Password123Abc is much different than PAssword123ABc!

Just my 2 cents.

Thanks!
 
Old 08-10-2011, 01:43 PM   #21
Nylex
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Maybe you need to take this up with the kernel developers, or the X developers.
 
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Old 08-10-2011, 04:06 PM   #22
whizje
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A possible solution is to use a ps2 keyboard it uses a higher IRQ so that it doesn't have to wait for other IRQ's to finish first. Or you must give your keyboard a higher priority. Don't know if that's possible without a RT-kernel.
I got the same problem with a usb keyboard but a ps2 keyboard worked flawlessly.
 
Old 08-11-2011, 12:26 PM   #23
cedricsm
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Bug still persists and have no solution yet. Someone PM'd me with a possible solution.
 
Old 08-11-2011, 12:32 PM   #24
Nylex
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Quote:
Originally Posted by cedricsm View Post
Bug still persists and have no solution yet. Someone PM'd me with a possible solution.
Did you see posts 22 and 23 in this thread? Have you tried contacting the developers? LQ isn't an official place to report bugs with Linux or other software that runs on Linux (like X).
 
Old 08-11-2011, 01:40 PM   #25
cedricsm
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Yes I have a ps/2 keyboard right now. I only use one.
 
Old 08-11-2011, 01:59 PM   #26
whizje
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The problem is that when you press caps lock linux waits for confirmation from the keyboard controller. This is done with a interrupt that's a signal to the processor that a device has data or can receive data. This confirmation can take 6 to 7 ms. But there are also other devices that send interrupts to the processor. And when there a multiple interrupts they are handled in priorities historically the ps2 keyboard had one of the highest priorities. But with the arrival from usb this has changed. A usb device can have a much lower priority so that it can take 200 or 300 ms before the keyboard interrupt is handled. In this time you can have pressed another key but as long the confirmation from the keyboard is not handled linux says caps lock is not enabled or disabled. So by using a ps2 keyboard you can be assured that a interrupt from the keyboard is handled as quickly as possible. The alternative is giving usb a high priority irq in the bios. Or fiddling with priority schemes as a last resort.
 
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Old 08-11-2011, 02:02 PM   #27
whizje
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And do you have the problem also with the ps2 keyboard?
 
Old 08-11-2011, 02:03 PM   #28
archtoad6
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whizje,
Are you saying that w/ the right IRQ assignment an old PS2 keyboard will be more responsive than a new USB one?


To everyone who is having this problem: Which kind of keyboard are you using?
 
Old 08-11-2011, 02:05 PM   #29
whizje
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For caps lock, num lock and scroll lock yes that are the keys that need confirmation because of the leds.
 
Old 08-11-2011, 02:09 PM   #30
archtoad6
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How hard would it be explain why?
Never mind, see #26 above. (Sorry for the silly Q, I didn't notice several posts that happenend very close to each other.) BTW, I owe you rep for that one.

Last edited by archtoad6; 08-11-2011 at 02:36 PM.
 
  


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