diff options
author | Jason McIntyre <jmc@cvs.openbsd.org> | 2007-04-26 13:27:58 +0000 |
---|---|---|
committer | Jason McIntyre <jmc@cvs.openbsd.org> | 2007-04-26 13:27:58 +0000 |
commit | 93c5de0884960f25532c07ea090011e8c80ccad6 (patch) | |
tree | 0fe4c8f52cafcc269337e09ca18d79189fad01e4 /share/man/man4/man4.i386 | |
parent | 3012880dbf741710fc13c957c627465c346b6aaf (diff) |
tweaks;
Diffstat (limited to 'share/man/man4/man4.i386')
-rw-r--r-- | share/man/man4/man4.i386/piixpcib.4 | 22 |
1 files changed, 13 insertions, 9 deletions
diff --git a/share/man/man4/man4.i386/piixpcib.4 b/share/man/man4/man4.i386/piixpcib.4 index ca2501605c3..6f2dc18489f 100644 --- a/share/man/man4/man4.i386/piixpcib.4 +++ b/share/man/man4/man4.i386/piixpcib.4 @@ -1,4 +1,4 @@ -.\" $OpenBSD: piixpcib.4,v 1.1 2007/04/26 01:43:14 gwk Exp $ +.\" $OpenBSD: piixpcib.4,v 1.2 2007/04/26 13:27:57 jmc Exp $ .\" .\" Copyright (c) 2007 Stefan Sperling <stsp@stsp.in-berlin.de> .\" @@ -31,7 +31,7 @@ driver supports Intel and .Tn 82440MX PIIX4 ISA bridges. - +.Pp Besides the core .Xr pcib 4 functionality, the @@ -46,17 +46,18 @@ The daemon can be used to automatically control CPU frequency. SpeedStep provides two CPU power states, low and high. The driver will switch the CPU into low power state if the -hw.setperf sysctl is smaller or equal 50, and into high -power state if hw.setperf is greater 50. +.Va hw.setperf +sysctl is less than or equal to 50, +and into high power state if it is greater than 50. .Sh SEE ALSO .Xr cpu 4 , +.Xr ichpcib 4 , .Xr intro 4 , .Xr isa 4 , .Xr pci 4 , .Xr pcib 4 , -.Xr ichpcib 4 , -.Xr sysctl 8 , -.Xr apmd 8 +.Xr apmd 8 , +.Xr sysctl 8 .Sh HISTORY The .Nm @@ -64,10 +65,13 @@ driver first appeared in .Ox 4.2 . .Sh BUGS The driver sometimes fails to update the hw.cpuspeed sysctl correctly -after switching power state. The reason is that there seems to be +after switching power state. +The reason is that there seems to be no reliable way to determine CPU frequencies corresponding to low and high power states, so the driver has to rely on the p3_update_cpuspeed function to dynamically determine CPU speed after switching power state. This seems to fail occasionally, especially if interrupt load of the system -is high. Note that this bug is purely cosmetic. Switching power state still +is high. +Note that this bug is purely cosmetic. +Switching power state still works even if the CPU speed is displayed incorrectly. |