Problem with ACPI for Acer Aspire Laptops 1680 serire (1681WLCi) DEFINITIVELY RESOLVED Yesterday night (09 Jun 2005) I resolved all my problem for this kind of laptop that use non standard DSDT. Befor I was unable to find anithing into the directory /proc/acpi/ac_adapter and /proc/acpi/battery and I was unable to see the status of my battery. Moreover I my ACPI doesn't work properly. I use SuSe 9.3 but I think with some modification this guide is usefull for every kind of distribution. This is a version 1.0 of this guide, not definitive!! I'm writing it as fast as possible to give you the possibility to take in account this way to solve the problem. In the next days I will a more definitive guide at this address www.whoopy.it/linux/ at this link you can find this document too and all the files that are requested in this document Everyone who want to help me or contribute to this work is welcome < linux@whoopy.it > I hope this is usefull to you Iacopo_I linux@whoopy.it Patch to Kernel for SuSe 9.3 1) Download acpi_patch.tar.gz: This kind of Laptops has another problem over the bugged DSDT, there is a missing ECDT. The ECDT is used to provide some minimal information about the Embedded Controller to the ACPI drivers before the Embedded Controller region has actually been parsed from the DSDT. This is frequently necessary before initializing the battery and ac adapter, so if you have errors in dmesg from the battery, adapter or EmbeddedControl, the ECDT is the likely culprit. The problem was that after booting, my /proc/acpi/ac_adapter and /proc/acpi/battery directories were empty. To resolve this problem there is a patch at this address http://bugzilla.kernel.org/attachment.cgi?id=1690&action=view . This patch restore the missing ECDT-related functionality. It may be applied to both the 2.4 and 2.6 kerenl source. If you are using Suse 9.3 it does't work, because the sources file name change, but the code is the same. In the file acpi_patch.tar.gz you can find all the corrected files you need, you have only to copy them into the appropriate directory of your sistem (after a back-up of existing files!! - Naturally! ;P ). Files to modify: ################################# 1) PATH_TO_KERNEL/drivers/acpi/ec.c 2) PATH_TO_KERNEL/drivers/acpi/events/evregion.c 3) PATH_TO_KERNEL/drivers/acpi/executer/exregion.c 4) PATH_TO_KERNEL/drivers/acpi/utilities/utglobal.c 5) PATH_TO_KERNEL/include/acpi/acglobal.h 6) PATH_TO_KERNEL/include/acpi/acinterp.h Probably you have to change the "PATH_TO_KERNEL" with "/usr/src/linux", but is better tha you follow your system documentation. 2) Download dsdtAspire1680.tar.gz: This file contain the correct DSDT file for the Acer laptops of serie 1680 (as 1681, 1681Wlmi, 1681Wlci, 1682.. etc..). The other two files are the patch you need to use the Smart Battery that this kind of laptops use. At this address https://sourceforge.net/projects/sbs-linux/ you can find the SourceForge project dedicate to this. Here you can find the offcial patch, but it doesn't work on 1680 if you don't modify before the dsdt. In the file you find the work done, you have only to untar the archive and follow next steps. 3) Download iasl: You have to install somewere in your path the compiler iasl of Intel, you can find last version at this address http://developer.intel.com/technology/iapc/acpi/downloads.htm it is necessary to compile the correct DSDT for your system. 4) Recompile dsdt: Go into the directory where you have extract the dsdtAspire1680.tar.gz file. iasl -td dsdt.dsl this will create two files dsdt.hex and DSDT.aml, they ae usefull for next steps 5) Fixing the dsdt: If there are some errors douring step 4 you need to correct them. But I think there aren't. Looks at Google for fixing the problem, as soon as possible I will put on-line a guide to correct some errors. 6) Incorporatng fixed DSDT into the Kernel If you are using SuSe there are non problems 6a) copy the compiled DSDT.aml file e.g. to /etc 6b) add the path pointing to e.g. /etc/DSDT.aml to /etc/sysconfig/kernel ACPI_DSDT="/etc/DSDT.aml" If you are not using Suse visit http://forums.gentoo.org/viewtopic.php?t=122145 on thi forum you can find at chapter 9 some useful ways to do this. 7) Make sure you have done the step 1, 2, 3, 4, 5, 6 8) Recompile your kernel 8a) cd /usr/src/linux 8b) make 8c) make modules_install 8d) make install 9) Reboot