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devsk
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Joined: 24 Oct 2003
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Location: Bay Area, CA
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 Posted: Wed May 19, 2004 5:59 am Post subject: Bring down the system with phone ring!! |
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OK, this sounds freaky but my system has lockedup/rebooted at least 10 times just because my phone rang(another reason to hate tele-marketeers). The events/0 process starts to eat up 100% cpu, my keyboard and mouse don't respond.
I am running gentoo-dev 2.6.5. Nothing appears in dmesg/log-messages.
Is it possible that the frequency of the cord-less phone interferes with the cord-less mouse/keyboard and triggers mouse events which don't make sense to X/kernel and eventually lead to kernel hang?
logitech USB cordless keybd and mouse. |
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John5788
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Joined: 06 Apr 2004
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| Posted: Wed May 19, 2004 6:09 am Post subject: |
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the matrix is after you..
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devsk
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Joined: 24 Oct 2003
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Location: Bay Area, CA
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| Posted: Wed May 19, 2004 5:23 pm Post subject: |
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| John5788 wrote: | | the matrix is after you.. |
kidding apart, I can reproduce this EVERYTIME with 2.6.5 gentoo-dev-sources and ACPI enabled. Can somebody confirm that with cordless mouse, keyboard and phone this happens with 2.6.5 gentoo-dev-sources and ACPI enabled?
With APM, I can't reproduce it. But with APM, at times I am not able to shutdown the system i.e. it says "power down", but the power stays on. So, I have to use ACPI.
There is a bug with ACPI to be caught here. |
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Jake
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Joined: 31 Jul 2003
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| Posted: Wed May 19, 2004 6:24 pm Post subject: Re: Bring down the system with phone ring!! |
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| devsk wrote: | | Is it possible that the frequency of the cord-less phone interferes with the cord-less mouse/keyboard... |
Try using a different keyboard and mouse, if possible. |
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hgomersall
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Joined: 08 Jul 2002
Posts: 135
Location: Cambridge, UK
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| Posted: Wed May 19, 2004 6:34 pm Post subject: Re: Bring down the system with phone ring!! |
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| devsk wrote: | | Is it possible that the frequency of the cord-less phone interferes with the cord-less mouse/keyboard and triggers mouse events which don't make sense to X/kernel and eventually lead to kernel hang? |
This is entirely possible from the hardware perspective (not sure about the kernel hanging bit). Try comparing bands.
Some keyboards/mice use the 2.45GHz ISM band, which is also open to use by cordless phones (indeed, some cordless phones do use it). In the UK, most cordless phones use DECT, which is in another band (1880-1900MHz Google seems to throw up), although i suppose it depends how tightly they conform to specs. |
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devsk
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Joined: 24 Oct 2003
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Location: Bay Area, CA
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| Posted: Wed May 19, 2004 8:56 pm Post subject: Re: Bring down the system with phone ring!! |
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| hgomersall wrote: | | devsk wrote: | | Is it possible that the frequency of the cord-less phone interferes with the cord-less mouse/keyboard and triggers mouse events which don't make sense to X/kernel and eventually lead to kernel hang? |
This is entirely possible from the hardware perspective (not sure about the kernel hanging bit). Try comparing bands.
Some keyboards/mice use the 2.45GHz ISM band, which is also open to use by cordless phones (indeed, some cordless phones do use it). In the UK, most cordless phones use DECT, which is in another band (1880-1900MHz Google seems to throw up), although i suppose it depends how tightly they conform to specs. |
My cordless phone is 2.4GHz.
events/0 process consuming 100% CPU and keyboard/mouse not responding, followed by reboot, if that is not kernel hanging then what else is.
I will try a corded kbd and post what happens. |
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PrakashP
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Joined: 27 Oct 2003
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Location: C.C.A.A., Germania
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| Posted: Wed May 19, 2004 9:29 pm Post subject: |
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| I read in the German forum that a guy using ISDN ( und thus such a modem) has this problem, as well... |
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hgomersall
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Joined: 08 Jul 2002
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Location: Cambridge, UK
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| Posted: Wed May 19, 2004 9:45 pm Post subject: Re: Bring down the system with phone ring!! |
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| devsk wrote: |
My cordless phone is 2.4GHz. |
In that case, it seems very likely that your phone is using the same band as your mouse/keyboard. Dirty signals causing the problem. |
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ebrostig
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| Posted: Wed May 19, 2004 9:46 pm Post subject: |
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Is your CPU running at 2.4GHz too? 
Erik
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devsk
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Location: Bay Area, CA
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| Posted: Wed May 19, 2004 11:19 pm Post subject: |
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| ebrostig wrote: | Is your CPU running at 2.4GHz too?
Erik |
no kidding man!!
what is it about 2.4 GHz!! |
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devsk
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| Posted: Thu May 20, 2004 12:15 am Post subject: Re: Bring down the system with phone ring!! |
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| hgomersall wrote: | | devsk wrote: |
My cordless phone is 2.4GHz. |
In that case, it seems very likely that your phone is using the same band as your mouse/keyboard. Dirty signals causing the problem. |
But the question remains that why does it not happen with APM. Why only with ACPI? |
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Rainmaker
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| Posted: Thu May 20, 2004 12:38 am Post subject: |
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Maybe it's a bug with the driver not calling pm_lock or something...You might want to mail to the maintainer about this..
P.s. that's some freaky shit, your phone ringing and linux crashing...
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devsk
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| Posted: Wed Jul 07, 2004 11:21 pm Post subject: |
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| Rainmaker wrote: | Maybe it's a bug with the driver not calling pm_lock or something...You might want to mail to the maintainer about this..
P.s. that's some freaky shit, your phone ringing and linux crashing... |
this issue was fixed with me removing the PS/2 adapter (old pre-stable-USB-driver days) and plugging the keyboard directly into a USB port. |
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Hypnos
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| Posted: Thu Jul 08, 2004 12:15 am Post subject: |
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| Quote: | | devsk wrote: | | P.s. that's some freaky shit, your phone ringing and linux crashing... |
this issue was fixed with me removing the PS/2 adapter (old pre-stable-USB-driver days) and plugging the keyboard directly into a USB port. |
I doubt it's the 2.4GHz interference. Rather, PS/2 and low speed USB both have host clocks at 6MHz, which is precisely the channel width of cordless phones. I'm wondering if your cordless phone is defective/broken and is spewing huge power at this modulation frequency.
I'll bet you a nickel that the problem goes away if you replace the cordless phone.
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