Date: Sat, 11 Mar 2000 10:30:20 +0900 From: Kazutaka YOKOTA <yokota@zodiac.mech.utsunomiya-u.ac.jp> To: Ryan Thompson <ryan@sasknow.com> Cc: freebsd-current@freebsd.org, yokota@zodiac.mech.utsunomiya-u.ac.jp Subject: Re: Keyboard troubles Message-ID: <200003110130.KAA10812@zodiac.mech.utsunomiya-u.ac.jp> In-Reply-To: Your message of "Fri, 10 Mar 2000 19:06:12 CST." <Pine.BSF.4.21.0003101859560.8418-100000@ren.sasknow.com> References: <Pine.BSF.4.21.0003101859560.8418-100000@ren.sasknow.com>
next in thread | previous in thread | raw e-mail | index | archive | help
>On my -current system, after rebooting, the keyboard was in a funny state >(all 4 LEDs were turned on. My keyboard also has an internal click >mechanism, which was no longer functional) I plugged the keyboard into >another machine at that point, and it reset itself and worked fine on that >machine. Plugging it back into the -current box, however, produced the >same results as before. > >Fearing incompatibility, I dug out an old AT keyboard and plugged it >in. No LEDs lit, and also no response from keypresses (including the >obvious escape characters). > >The machine didn't hang... console message were still being displayed. I >ended up rebooting the thing remotely, and after that, the keyboard >functioned normally. > >If somebody can tell me what else to check, I can try and provide a few >mroe details. It sounds like the keyboard interface of your motherboard has somewhat become flaky; it may even be broken. It is NOT recommended that you attach or detach the keyboard while the power is on. The keyboard interface of the PC motherboard is not designed for hot-plugging/unplugging. It is too easy to fry the keyboard interface and/or controller by doing so. Even if the keyboard interface survives hot-plugging, there is no assurance that the keyboard and the keyboard controller on the motherboard can communicate properly after hot-plugging; they are simply not designed to cope with such situation. I personally know a couple of people who broke their motherboard this way. Kazu To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?200003110130.KAA10812>