Bug 25521

Summary: Laptop with FreeBSD4.2 freezes in battery-use randomly for short time
Product: Base System Reporter: stitzinger_r <stitzinger_r>
Component: i386Assignee: freebsd-bugs (Nobody) <bugs>
Status: Closed FIXED    
Severity: Affects Only Me    
Priority: Normal    
Version: Unspecified   
Hardware: Any   
OS: Any   

Description stitzinger_r 2001-03-04 14:40:01 UTC 
Laptop with 82371AB powermanagement controller freezes in batteryuse
for a short time while probing floppy and CD-ROM without doing explicit 
access. This behaviour wasn't there in FreeBSD 3.1 and 4.0. Also
harddisk is pwoering down after a few seconds. Problem doesn't occure
in non-battery use except the harddisk seems t be powered down sometimes.

Fix: 

compiling in and out of intpm, apm, smbus and pcm didn't help
Comment 1 Rupert Stitzinger 2002-04-29 09:14:10 UTC 
problem is still existing under FreeBSD 4.5. When CD-ROM is removed 
(TEAC CD-224E) computer is running without stops.
Problem also occures with line-power use, but not so often.
Computer is freezing for 10s
According to a Linux FAQ this can be due to a not correct electrical 
implementation of the hardware (timing-problems). Also under DOS and 
Linux the machine freezes, but only for ca. .5s. There is something 
called "HeuristicPowerManagement" in the BIOS of this machine.
Comment 2 Volker Stolz freebsd_committer freebsd_triage 2005-08-26 10:07:20 UTC 
State Changed
From-To: open->closed

Closed: Submitter reported that this was a well-known hardware issue. 
While marking this PR as "analysed" or "suspended" might also seem, 
apropriate, I strongly doubt that it will ever be picked up (again).