Hi all , At first, thank you Jeff Garzik for your advise. I added debug infomations to apm.c and have tried it. See below: (APM driver enabled and output tons of debug messages)... apm_do_idle(): line 564 apm_bios_call_simple(): line 484 ...... (and yenta driver was loaded and it proved pcmcia sockets) apm_do_idle(): line 564 apm_bios_call_simple(): line 484 ... apm_do_idle(): line 564 apm_bios_call_simple(): line 484 apm_do_busy(): line 580 apm_bios_call_simple(): line 484 apm_event_handler(): line 1096 check_events(): line 998 get_event(): line 980 apm_get_event(): line 531 apm_bios_call(): line 449 apm_get_info(): line 1381 apm_get_power_status(): line 708 apm_bios_call(): line 449 (System hangs. It didn't accept any kernel-sysrq request, perhaps because of hardware lock-up.) I think I need to add some debug infomation to yenta driver. Anyone comments? Have you used yenta driver and apm driver with no problem? Thanks, A.Yoshiyama [EMAIL PROTECTED]
-- Versions installed: (if some fields are empty or look -- unusual then possibly you have very old versions) Linux mobile2 2.4.0-test9 #1 Mon Oct 9 00:15:50 JST 2000 i686 unknown Kernel modules 2.3.16 Gnu C 2.95.2 Binutils 2.10.0.26 Linux C Library 2.1.3 Dynamic linker ldd: version 1.9.11 Procps 2.0.6 Mount 2.10o Net-tools 2.05 Console-tools 0.2.3 Sh-utils 2.0i Modules Loaded ide-cs pcnet_cs 8390 ds yenta_socket pcmcia_core rtc nls_cp932 esssolo1 soundcore vfat fat autofs4