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r00t440 Tux's lil' helper
Joined: 14 Sep 2005 Posts: 93
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Posted: Mon Apr 01, 2013 4:05 pm Post subject: Missed Keystrokes |
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I have a cheap laptop with an unknown brand, there seems to be a problem with the way it handles keyboard input.
Here's how it behaves:
When typing it seems to sporadically skip characters. Example, if I type "Hello" there's a chance that the entered text just becomes "Hllo". I tried the following without luck:
* Different distros - I tried SystemRescueCD; Funtoo; Ubuntu; Different flavors of Sabayon
* An external USB keyboard
* Toggling ACPI during boot and some IRQ tricks I found from other forums
Some success:
Few months back, the symptom doesn't seem to exist on 32-bit Sabayon (64-bit versions always have the problem), however after several updates (also updated the kernel), the symptom re-emerged. In windows everything works fine so my guess is that this laptop uses some sort of low quality "keyboard controller" - not sure what's the term. It seems that its "input buffer" is buggy - at least on 64bit Linux.
I hope somebody can point to me which kernel option I should check or experiment with - I am comfortable to compiling the kernel (been doing it for like 10 years already). Probably some kernel options cause this behavior.
Laptop Specs:
Quote: | Intel Core i7-2630QM
6 MB, 2.0 GHz
Intel HM65
802.11 b/g/n
FreeDOS
4 GB DDR3
14.0″ HD (1366×768) LED
Intel HD Graphics 3000
500 GB
DVDRW SuperMulti
10/100/1000 Mbps
2 x USB 2.0
Bluetooth 2.1
1.3 MP Camera
6-cell Smart Li-ion |
Thanks in advance
** I've also posted this in: https://forum.sabayon.org/viewtopic.php?f=56&t=29577 |
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Budoka l33t
Joined: 03 Jun 2012 Posts: 777 Location: Tokyo, Japan
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Posted: Mon Apr 08, 2013 3:08 am Post subject: Re: Missed Keystrokes |
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r00t440 wrote: | I have a cheap laptop with an unknown brand, there seems to be a problem with the way it handles keyboard input.
Here's how it behaves:
When typing it seems to sporadically skip characters. Example, if I type "Hello" there's a chance that the entered text just becomes "Hllo". I tried the following without luck:
* Different distros - I tried SystemRescueCD; Funtoo; Ubuntu; Different flavors of Sabayon
* An external USB keyboard
* Toggling ACPI during boot and some IRQ tricks I found from other forums
Some success:
Few months back, the symptom doesn't seem to exist on 32-bit Sabayon (64-bit versions always have the problem), however after several updates (also updated the kernel), the symptom re-emerged. In windows everything works fine so my guess is that this laptop uses some sort of low quality "keyboard controller" - not sure what's the term. It seems that its "input buffer" is buggy - at least on 64bit Linux.
I hope somebody can point to me which kernel option I should check or experiment with - I am comfortable to compiling the kernel (been doing it for like 10 years already). Probably some kernel options cause this behavior.
Laptop Specs:
Quote: | Intel Core i7-2630QM
6 MB, 2.0 GHz
Intel HM65
802.11 b/g/n
FreeDOS
4 GB DDR3
14.0″ HD (1366×768) LED
Intel HD Graphics 3000
500 GB
DVDRW SuperMulti
10/100/1000 Mbps
2 x USB 2.0
Bluetooth 2.1
1.3 MP Camera
6-cell Smart Li-ion |
Thanks in advance
** I've also posted this in: https://forum.sabayon.org/viewtopic.php?f=56&t=29577 |
Are the letters that are getting dropped consistently the same? It could be something as simple as a dirty keyboard. |
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verchiel n00b
Joined: 25 Nov 2012 Posts: 15
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Posted: Mon Apr 08, 2013 4:34 am Post subject: |
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Well, r00t440 claimed to have tried an external keyboard, so dirt in the keyboard shouldn't be an issue. I would rather check the BIOS settings again and look for anything keyboard related as well as USB settings. Can you tell us your BIOS name/version (and maybe search for known issues as well)? And maybe be so kind and look for information on the mainboard and/or vendor information on the laptop, even if the brand is less well-known... what is its name anyway (model/vendor)? Or, if that information is unavailable, where did you buy it / do you have a link to the product? If it is really an OS problem then I'd rather guess it's about the mainboard/chipset. In many cases laptop keyboards are connected through PS/2 ports rather than USB though. Are you experiencing any other issues?
Cheers
Dan
Addendum: From the information you provided, it sounds pretty much like a Basic B57xx series model from the Neo brand. Just a guess.
Last edited by verchiel on Mon Apr 08, 2013 4:52 am; edited 2 times in total |
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Budoka l33t
Joined: 03 Jun 2012 Posts: 777 Location: Tokyo, Japan
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Posted: Mon Apr 08, 2013 4:36 am Post subject: |
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verchiel wrote: | Well, r00t440 claimed to have tried an external keyboard, so dirt in the keyboard shouldn't be an issue. I would rather check the BIOS settings again and look for anything keyboard related as well as USB settings. Can you tell us your BIOS name/version (and maybe search for known issues as well)?
If it is really an OS problem then I'd rather guess it's about the mainboard/chipset. In many cases laptop keyboards are connected through PS/2 ports rather than USB though. Are you experiencing any other issues?
Cheers
Dan |
Whoops. I missed that. |
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verchiel n00b
Joined: 25 Nov 2012 Posts: 15
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Posted: Mon Apr 08, 2013 4:59 am Post subject: |
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And just another guess... the backspace key might be malfunctioning. You could try disabling your PS/2 keyboard in the BIOS setup and see if it works fine if you use only your USB keyboard instead. Just another guess. And if there is no such option... well, I have to hint you that it might mean losing warranty, but I would open the laptop and unplug the keyboard. Or even unsolder if necessary. I don't recommend that though. ^^ |
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r00t440 Tux's lil' helper
Joined: 14 Sep 2005 Posts: 93
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Posted: Tue Apr 16, 2013 5:38 am Post subject: |
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verchiel wrote: | Well, r00t440 claimed to have tried an external keyboard, so dirt in the keyboard shouldn't be an issue. I would rather check the BIOS settings again and look for anything keyboard related as well as USB settings. Can you tell us your BIOS name/version (and maybe search for known issues as well)? And maybe be so kind and look for information on the mainboard and/or vendor information on the laptop, even if the brand is less well-known... what is its name anyway (model/vendor)? Or, if that information is unavailable, where did you buy it / do you have a link to the product? If it is really an OS problem then I'd rather guess it's about the mainboard/chipset. In many cases laptop keyboards are connected through PS/2 ports rather than USB though. Are you experiencing any other issues?
Cheers
Dan
Addendum: From the information you provided, it sounds pretty much like a Basic B57xx series model from the Neo brand. Just a guess. |
Wow, your guess is accurate. It's indeed a B5700N laptop. You must be from PH?
verchiel wrote: | And just another guess... the backspace key might be malfunctioning. You could try disabling your PS/2 keyboard in the BIOS setup and see if it works fine if you use only your USB keyboard instead. Just another guess. And if there is no such option... well, I have to hint you that it might mean losing warranty, but I would open the laptop and unplug the keyboard. Or even unsolder if necessary. I don't recommend that though. ^^ |
No, backspace is working perfectly fine. With regards to disabling PS/2 keyboard in BIOS, I'm not sure if I can do that, laptops normally have limited options in BIOS that you can tweak. How is that different with using an external keyboard? I'm at work atm and I can't access my laptop so I'll try your suggestion when I get back home this weekend.
With regards to the idea of unplugging the keyboard, won't be a problem because it's already out of warranty. If it fails, then I think I'll just buy a Windows license.
Thanks Budoka and verchiel for taking the time to reply, I appreciate it - gives me some hope.
Cheers |
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r00t440 Tux's lil' helper
Joined: 14 Sep 2005 Posts: 93
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Posted: Thu May 23, 2013 6:18 am Post subject: |
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Unable to solve this problem. I hope somebody out there can shed some light with this issue.
Issue doesn't exist in Window$.
TIA |
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teika Apprentice
Joined: 19 Feb 2011 Posts: 155 Location: YYYY-MM-DD, period. Have you ever used the Internet?
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Posted: Sat May 25, 2013 1:29 am Post subject: |
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I'm completely clueless, but is it only in X, or in consoles, too? |
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r00t440 Tux's lil' helper
Joined: 14 Sep 2005 Posts: 93
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Posted: Sat Jun 08, 2013 4:45 pm Post subject: |
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Hi teika, thanks for replying.
I'm clueless as well, all I have are symptoms of the problem. I think the best way forward is to just live with this issue, I'm thinking of utilizing this notebook as an HTPC.
Kind regards |
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Ant P. Watchman
Joined: 18 Apr 2009 Posts: 6920
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Posted: Sat Jun 08, 2013 5:30 pm Post subject: |
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Does this happen if you temporarily disable some of the extended powersaving features? I've seen similar things happen on an AMD CPU with C1E enabled and a Celeron with CONFIG_NO_HZ. |
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r00t440 Tux's lil' helper
Joined: 14 Sep 2005 Posts: 93
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Posted: Mon Jul 08, 2013 7:48 pm Post subject: |
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Ant P. wrote: | Does this happen if you temporarily disable some of the extended powersaving features? I've seen similar things happen on an AMD CPU with C1E enabled and a Celeron with CONFIG_NO_HZ. |
Hi Ant P. thanks for the idea, can this be configured during boot? - I'll google it.
Thanks |
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