From mboxrd@z Thu Jan 1 00:00:00 1970 From: Karl Hegbloom Subject: Synaptics and keyboard losing interrupts w/ACPI ? Date: Sat, 03 Apr 2004 18:09:09 -0800 Sender: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Message-ID: <1081044549.2179.281.camel@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Return-path: Errors-To: acpi-devel-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: linux-acpi@vger.kernel.org I apologize if this this is an FAQ or has already been answered; the sf.net list archive interface is... too feeble to suck. I wish they would switch to "lurker" (http://lurker.sourceforge.net/). I've got a laptop that has a synaptics touchpad. Every so often, with every kernel I've tried up through 2.6.4, the pointer will suddenly leap across the screen, and sometimes it will even push a GUI button there. Also, on occasion, a key will "stick down",,,,,,,,,,,, like that, until I push another key. Every now and then the keyboard quits working entirely, and I must reboot to regain control. When these things happen, I see, in the logs: Mar 29 08:04:37 localhost kernel: atkbd.c: Unknown key pressed (translated set 2, code 0x0 on isa0060/serio0). Mar 29 08:04:37 localhost kernel: atkbd.c: Use 'setkeycodes 00 ' to make it known. Mar 29 08:04:37 localhost kernel: atkbd.c: Unknown key pressed (translated set 2, code 0x0 on isa0060/serio0). Mar 29 08:04:37 localhost kernel: atkbd.c: Use 'setkeycodes 00 ' to make it known. Mar 29 08:04:37 localhost kernel: psmouse.c: TouchPad at isa0060/serio2/input0 lost synchronization, throwing 5 bytes away. Mar 29 08:05:16 localhost kernel: Synaptics driver lost sync at byte 4 Mar 29 08:05:16 localhost kernel: Synaptics driver lost sync at byte 1 Mar 29 08:05:16 localhost last message repeated 3 times Mar 29 08:05:16 localhost kernel: Synaptics driver resynced. There is also a message about an unknown scancode that also mentions that it's an XFree86 bug... that it should not access hardware directly. I also see that when I run the "console-tools" 'setkbdrate' command, which uses /dev/port to set the key repeat rate. The source mentions that on some architectures there's an ioctl for doing that. I am fairly certain that this "XFree86 bug" is probably not related to the other one or to ACPI. I am not the only one who experiences this problem, and this model of laptop is not the only one that supports this feature... After searching for those log messages at Google, I located several email messages saying things like that APM introduces latency to turn it off, and to try booting with "acpi=off" for similar reasons. Sure enough, when I boot with "acpi=off", the problem disappears entirely. The touchpad works perfectly, and the keyboard is fine. What I've decided is probably happening is that somewhere in the ACPI system, code is running for too long with interrupts disabled, so keyboard and touch-pad interrupts are being missed. What I want to know is, has this been reported before, and if so, has it been fixed since stock 2.6.4 was released? Will a patch from your sf site fix the problem? I sure wish I knew how to actually debug this kind of problem so that I could provide more specific information or a patch. -- If you feel like the machines are conspiring against you, then it's time to perspire against the machines. ------------------------------------------------------- This SF.Net email is sponsored by: IBM Linux Tutorials Free Linux tutorial presented by Daniel Robbins, President and CEO of GenToo technologies. Learn everything from fundamentals to system administration.http://ads.osdn.com/?ad_id=1470&alloc_id=3638&op=click