01-25-2012
Locking up 90% of the way through booting the kernel doesn't sound like antitrust firmware things, as much as kernels which need to scramble to catch up with yet more creatively broken hardware and firmware. Linux uses many things about the BIOS and chipset in ways Windows doesn't, and when you look in the dusty corners Windows doesn't use, things can be pretty unsightly.
---------- Post updated at 02:50 PM ---------- Previous update was at 02:47 PM ----------
I had a similar experience with my Tyan Thunder K8W board, where the Linux kernels I had supported the board, but not its hard-drive controller. I had to build a newer Linux kernel inside an ancient IDE drive with barely enough room for anything, before I could get the system using the shiny new SATA drive I got for it.
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LEARN ABOUT DEBIAN
hal-disable-polling
HAL-DISABLE-POLLING(1) General Commands Manual HAL-DISABLE-POLLING(1)
NAME
hal-disable-polling - disable polling on drives with removable media
SYNOPSIS
hal-disable-polling [options]
DESCRIPTION
hal-disable-polling can be used to to disable and enable media detection on drives with removable storage. For more information about both
the big picture and specific HAL properties, refer to the HAL spec which can be found in /usr/share/doc/hal-doc/spec/hal-spec.html depend-
ing on the distribution.
OPTIONS
The following options are supported:
--udi The UDI (Unique Device Identifier) of the device object.
--device
The device file of the drive.
--enable-polling
Enable polling instead of disabling it.
--help Print out usage.
--version
Print the version.
NOTES
This program requires super user privileges.
RETURN VALUE
If the requested operation was successful, this program will exit with exit code 0.
HISTORY
Polling a storage drive is a necessary evil to detect when the user inserts or removes media. Human computer interaction studies have shown
that a broad class of users expect their system to react within a few seconds of this. Thus, the hald daemon polls through the hald-addon-
storage addon (one instance for each drive with removable media).
The purpose of the hald-addon-storage addon is simply to open the special device file at a regular interval (either every 2 or every 16
seconds) to check for new media. This program tries to open the device file using the O_EXCL option which means that programs like
cdrecord(1) that uses O_EXCL automatically prevents the hald-addon-storage for interferring by continously opening the device file. In
addition, if the drive is locked using HAL (see hal-lock(1)) the addon also stops polling.
Unfortunately, polling a storage drive can have adverse side effects if the hardware and/or device driver for the hardware is malfunction-
ing. Additionally, the operating system kernel itself may offer multiple interfaces for the same device (e.g. /dev/sg0 and /dev/scd0) so
even O_EXCL won't work. Also, polling a drive may decrease throughput in certain (odd and/or broken) configurations; for example, if two
IDE drives shares the same host (master/slave), bus traffic and contention caused by polling e.g. the optical drive (slave) can reduce
throughput to the hard disk (master) and/or interfere with CD burning on another optical drive (master). Finally, polling a drive incurs an
overhead both in the host system (processes get woken up often, preventing the CPU to stay in a deep power saving states) and it may pre-
vent the actual drive from reaching deep power states as well. As a result, more power is consumed and this affects battery life for lap-
tops.
Despite the existence of support for asynchronous media change notification in recent MMC (Multi-Media Commands) specifications, virtually
no optical drives are compliant with the specification. Fortunately newer SATA ATAPI hardware seems to support Asynchronous Notification
(AN) and at this time of writing (March 2007) work is underway to make both the Linux operating system kernel and HAL take advantage of
this.
It is the position of the HAL team that polling should be avoided at all costs as long as it doesn't heavily impact the user experience in
a negative way. This tool is provided as a stop-gap measure to use if a system is rendered useless due to bugs in drivers and/or hardware
that is provoked by HAL polling the drive. If such a bug is encountered it should be reported (see the BUGS section below) so it can be
fixed - historically hald have triggered a number of bugs in Linux storage drivers and related subsystems (such as USB) that have later
been fixed.
BUGS
Please send bug reports to either the distribution or the HAL mailing list, see http://lists.freedesktop.org/mailman/listinfo/hal on how to
subscribe.
SEE ALSO
hald(8), lshal(1), hal-lock(1), open(2), http://www.t10.org/scsi-3.htm, https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=halpolling
AUTHOR
Written by David Zeuthen <david@fubar.dk> with a lot of help from many others.
HAL-DISABLE-POLLING(1)