Date: Sat, 22 Apr 2000 10:42:02 -0700 (PDT) From: asaddi@philosophysw.com To: FreeBSD-gnats-submit@freebsd.org Subject: i386/18162: APM: Add flag to disable timer-based BIOS requests [PATCH] Message-ID: <200004221742.KAA00536@trantor.philosophysw.com>
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>Number: 18162
>Category: i386
>Synopsis: APM: Add flag to disable timer-based BIOS requests [PATCH]
>Confidential: no
>Severity: non-critical
>Priority: low
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: wish
>Submitter-Id: current-users
>Arrival-Date: Sat Apr 22 10:50:02 PDT 2000
>Closed-Date:
>Last-Modified:
>Originator: Allan Saddi
>Release: FreeBSD 4.0-STABLE i386
>Organization:
Philosophy SoftWorks
>Environment:
FreeBSD trantor.philosophysw.com 4.0-STABLE FreeBSD 4.0-STABLE #42: Sat Apr 22 03:46:31 PDT 2000 root@utopia.philosophysw.com:/usr/src/sys/compile/TRANTOR i386
>Description:
On my Compaq Presario 1215, the timer-based suspend/standby requests
from BIOS interfere with normal APM operation. For example, when I use
'zzz' to suspend, my laptop will wake up on its own after 15 minutes
due to a BIOS request. (I can only assume it's attempting a suspend-to-
disk operation, which I really haven't gotten to work yet.)
I cannot disable these requests from BIOS setup, hence this patch. I am
using device flag 0x40, which does not appear to be used, to signify
that BIOS timer requests should be disabled from apm_attach().
>How-To-Repeat:
Suspend using 'zzz' when on battery power. Wait 15 minutes.
>Fix:
--- sys/i386/apm/apm.c.orig Sun Feb 6 06:57:05 2000
+++ sys/i386/apm/apm.c Sat Apr 22 04:17:55 2000
@@ -219,6 +219,19 @@
return (apm_bioscall());
}
+/* enable/disable timer-based standby/suspend requests (APM 1.2 or later) */
+static int
+apm_enable_disable_timer_req(int enable)
+{
+ struct apm_softc *sc = &apm_softc;
+
+ sc->bios.r.eax = (APM_BIOS << 8) | APM_TIMERREQUESTS;
+ sc->bios.r.ebx = PMDV_APMBIOS;
+ sc->bios.r.ecx = enable;
+ sc->bios.r.edx = 0;
+ return (apm_bioscall());
+}
+
/* get PM event */
static u_int
apm_getevent(void)
@@ -1072,6 +1085,16 @@
printf("apm: *Warning* engage function failed err=[%x]",
(sc->bios.r.eax >> 8) & 0xff);
printf(" (Docked or using external power?).\n");
+#endif
+ }
+ }
+
+ /* disable timer requests, if flag 0x40 is set (APM 1.2 or later) */
+ if (sc->intversion >= INTVERSION(1, 2) && (flags & 0x40)) {
+ if (apm_enable_disable_timer_req(0)) {
+#ifdef APM_DEBUG
+ printf("apm: *Warning* timer request function failed! [%x]\n",
+ (sc->bios.r.eax >> 8) & 0xff);
#endif
}
}
>Release-Note:
>Audit-Trail:
>Unformatted:
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