Re: Real-Time Preemption -RT-V0.7.51-17 - Keyboard Problems

From: K.R. Foley (kr_at_cybsft.com)
Date: 07/08/05

  • Next message: Rudo Thomas: "2.6.12.2 -- time passes faster; related to the acpi_register_gsi() call" 
    Date:	Fri, 08 Jul 2005 15:27:50 -0500
To: Doug Maxey <dwm@maxeymade.com>

    Doug Maxey wrote:
    > On Fri, 08 Jul 2005 21:13:26 +0200, Ingo Molnar wrote:
    >
    >>* K.R. Foley <kr@cybsft.com> wrote:
    >>
    >>
    >>>Ingo,
    >>>
    >>>I have an issue with keys VERY SPORADICALLY repeating, SOMETIMES, when
    >>>running the RT patches. The problem manifests itself as if the key
    >>>were stuck but happens far too quickly for that to be the case. I
    >>>realize that the statements above are far from scientific, but I can't
    >>>seem to narrow it down further. 2.6.12 doesn't seem to have the
    >>>problem at all, only when running the RT patches. It SEEMS to have
    >>>gotten worse lately. I am attaching my config as well as the output
    >>>from lspci.
    >>>
    >>>Adjusting the delay in the keyboard repeat seems to help. Any ideas?
    >
    >
    > Is the keyboard standard (PS2) or USB? Did not see the detail.

    Sorry. It is PS2.

    >
    >
    >>hm. Would be nice to somehow find a condition that triggers it. One
    >>possibility is that something else is starving the keyboard handling
    >>path. Right now it's handled via workqueues, which live in keventd. Do
    >>things improve if you chrt keventd up to prio 99? Also i'd chrt the
    >>keyboard IRQ thread up to prio 99 too.
    >>
    >>the other possibility is some IRQ handling bug - those are usually
    >>specific to the IRQ controller, so try turning off (or on) the IO-APIC
    >>[if the box has an IO-APIC], does that change anything?
    >
    >
    > FWIW, I have seen this issue under USB, off and on since about 2.6.9.
    > Never have dug into it, was always simpler to just unplug and re-plug
    > the keyboard. Of course, this predates RT.
    >
    > ++doug
    >
    > 

    -- 
    kr
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/
  • Next message: Rudo Thomas: "2.6.12.2 -- time passes faster; related to the acpi_register_gsi() call"

    Relevant Pages

    • Re: P5K Series - where to plug in the mouse?
      ... I made the mistake of buying this mb too because whne I read PS2 in the ... specs I made the wrong assumption of it having both mouse and keyboard ... only had PS2 so i had to go and buy a new KVM with USB. ... Thanks a lot Asus, ...
      (alt.comp.periphs.mainboard.asus)
    • Re: P5K Series - where to plug in the mouse?
      ... I made the mistake of buying this mb too because whne I read PS2 in the specs I made the wrong assumption of it having both mouse and keyboard PS2. ... This mb cost me an extra $60.00 because I use KVM's and my KVM only had PS2 so i had to go and buy a new KVM with USB. ...
      (alt.comp.periphs.mainboard.asus)
    • Re: Old non-USB keyboard with USB-only PC?
      ... continue using a really old keyboard. ... If I remove the PS2 to USB adaptor and plug this KB ...
      (microsoft.public.windowsxp.hardware)
    • Re: Cant Reinstall XP Pro
      ... >>>Purchase a cheap, temporary PS2 Keyboard. ... Or if there is a USB to PS2 ... >>>PS2 converter. ...
      (alt.sys.pc-clone.dell)
    • Re: Cant Reinstall XP Pro
      ... >>> Yesterday I was on the phone with Dell tech support for two hours. ... >>> Microsoft USB keyboard I happen to have spare. ... Or if there is a USB to PS2 ...
      (alt.sys.pc-clone.dell)