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| author | iwasaki <iwasaki@FreeBSD.org> | 1999-10-30 14:56:01 +0000 |
|---|---|---|
| committer | iwasaki <iwasaki@FreeBSD.org> | 1999-10-30 14:56:01 +0000 |
| commit | 945a25b48913c2f1a8b8f0aadcb902c3189ed927 (patch) | |
| tree | 44779f7a28dcd79760060b54d492be07d1a097e2 /sys/i386/apm | |
| parent | 437d3feb752ab5ec3128771f54f8a684bf186e02 (diff) | |
| download | FreeBSD-src-945a25b48913c2f1a8b8f0aadcb902c3189ed927.zip FreeBSD-src-945a25b48913c2f1a8b8f0aadcb902c3189ed927.tar.gz | |
i8254_restore is called from apm_default_resume() to reload
the countdown register.
this should not be necessary but there are broken laptops that
do not restore the countdown register on resume.
when it happnes, it messes up the hardclock interval and system clock,
which leads to the infamous "calcru: negative time" problem.
Submitted by: kjc, iwasaki
Reviewed by: Steve O'Hara-Smith <steveo@eircom.net> and committers.
Obtained from: PAO3
Diffstat (limited to 'sys/i386/apm')
| -rw-r--r-- | sys/i386/apm/apm.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/sys/i386/apm/apm.c b/sys/i386/apm/apm.c index 96860f6..9630f02 100644 --- a/sys/i386/apm/apm.c +++ b/sys/i386/apm/apm.c @@ -404,6 +404,7 @@ apm_default_resume(void *arg) /* modified for adjkerntz */ pl = splsoftclock(); + i8254_restore(); /* restore timer_freq and hz */ inittodr(0); /* adjust time to RTC */ microtime(&resume_time); getmicrotime(&tmp_time); |
