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Zoltan Devai 59bdb43769 Input: pcspkr - fix PIT lockup on some chipsets 
There've been reports [1] about the sysem bell causing a hard
lockup.  My machine was affected as well: any speaker output hung
the machine completely, nothing in the logs, no magic sysrq,
etc., looked like a hardware problem.  Had a closer look on the
issue, and it turned out that the pcspkr module is responsible.
The cause is the bad setup of Timer 2 in the i8253 controller,
which probably hangs the whole PIT controller.

Intel datasheets [2] state that the timer registers are in an
undefined state after reset and they need to be programmed before
enabling the timer. (And enabling without programming the
frequency first doesn't make sense anyway).

I don't know which chipsets are affected (if not all), it also
depends on the BIOS whether it initializes the timer (e.g. to
beep when you start the machine).

The following patch solved the issue on my ICH6 notebook,
couldn't test it with any others, but should be safe to apply.

[1]
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/146151
https://bugs.launchpad.net/ubuntu/+bug/270790
http://ubuntuforums.org/showthread.php?t=227693
http://bugs.gentoo.org/show_bug.cgi?id=222583
https://bugzilla.redhat.com/show_bug.cgi?id=454225

[2]
http://www.intel.com/assets/pdf/datasheet/252516.pdf
http://www.intel.com/assets/pdf/datasheet/301473.pdf
http://www.intel.com/design/chipsets/datashts/29065503.pdf

Signed-off-by: Zoltan Devai <zdevai@gmail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
 		2008-11-19 16:54:59 -05:00
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accessibility
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acpi ACPI suspend: build fix for ACPI_SLEEP=n && XEN_SAVE_RESTORE=y. 2008-10-25 04:07:13 -04:00
amba
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ata libata: fix NCQ devices behind port multipliers 2008-10-27 19:25:30 +01:00
atm
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auxdisplay
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base memory_probe: fix wrong sysfs file attribute 2008-10-20 08:52:32 -07:00
block [PATCH] sanitize blkdev_get() and friends 2008-10-21 07:49:06 -04:00
bluetooth btsdio: free sk_buff with kfree_skb 2008-10-26 23:08:48 -07:00
cdrom [PATCH] switch viocd 2008-10-21 07:48:21 -04:00
char Tidy up addresses in random drivers 2008-10-27 08:39:52 -07:00
clocksource Merge branches 'timers/clocksource', 'timers/hrtimers', 'timers/nohz', 'timers/ntp', 'timers/posixtimers' and 'timers/debug' into v28-timers-for-linus 2008-10-20 13:14:06 +02:00
connector
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cpufreq
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cpuidle Merge branch 'v28-range-hrtimers-for-linus-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-10-23 10:53:02 -07:00
crypto
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dca
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dio
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dma Merge branch 'i7300_idle' into release 2008-10-25 04:07:44 -04:00
edac edac cell: fix incorrect edac_mode 2008-10-20 08:52:40 -07:00
eisa
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firewire firewire: fw-sbp2: fix races 2008-10-26 10:27:01 +01:00
firmware x86: sysfs: kill owner field from attribute 2008-10-20 08:52:42 -07:00
gpio mfd: twl4030-gpio driver 2008-10-22 01:19:39 +02:00
gpu Merge branch 'drm-next' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6 2008-10-23 10:18:40 -07:00
hid Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid 2008-10-26 16:34:14 -07:00
hwmon hwmon: (abituguru3) enable DMI probing feature on AW9D-MAX 2008-10-26 17:04:40 +01:00
i2c Merge branch 'i2c-for-linus' of git://jdelvare.pck.nerim.net/jdelvare-2.6 2008-10-23 10:10:25 -07:00
ide arm ide breakage 2008-10-26 09:35:05 -07:00
idle i7300_idle: Cleanup based review comments 2008-10-24 12:55:14 -04:00
ieee1394 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6 2008-10-16 15:02:24 -07:00
infiniband Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband 2008-10-23 08:16:03 -07:00
input Input: pcspkr - fix PIT lockup on some chipsets 2008-11-19 16:54:59 -05:00
isdn
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leds leds: da903x: fix the building failure of incomplete type of 'work' 2008-10-27 08:38:16 -07:00
lguest
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macintosh
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mca
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md Merge branch 'for-linus' of git://neil.brown.name/md 2008-10-26 16:42:18 -07:00
media V4L/DVB (9336): cx88: always de-alloc frontends on fault condition 2008-10-21 14:32:12 -02:00
memstick [PATCH] switch memstick 2008-10-21 07:48:33 -04:00
message Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2008-10-23 13:02:03 -07:00
mfd mfd: Make WM8400 depend on I2C until SPI is submitted 2008-10-24 18:34:39 +02:00
misc intel_menlo: fix build warning 2008-10-23 00:43:47 -04:00
mmc [PATCH] switch mmc 2008-10-21 07:48:37 -04:00
mtd [PATCH] propagate mode through open_bdev_excl/close_bdev_excl 2008-10-21 07:49:00 -04:00
net libertas: free sk_buff with kfree_skb 2008-10-26 23:09:27 -07:00
nubus nubus: fix mis-indented statement 2008-10-16 11:21:30 -07:00
of Merge commit 'kumar/kumar-for-2.6.28' 2008-10-21 15:49:55 +11:00
oprofile Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rric/oprofile 2008-10-23 10:05:40 -07:00
parisc [PATCH] introduce fmode_t, do annotations 2008-10-21 07:47:06 -04:00
parport 8250: Oxford Semiconductor Devices 2008-10-23 09:31:09 -07:00
pci ACPI: Oops in ACPI with git latest 2008-10-25 04:07:14 -04:00
pcmcia Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm 2008-10-23 08:12:21 -07:00
pnp Merge branch 'linus' into test 2008-10-23 00:11:07 -04:00
power Merge git://git.infradead.org/battery-2.6 2008-10-20 09:44:30 -07:00
ps3 ps3: Add passthru support for non-audio streams 2008-10-20 08:05:15 +02:00
rapidio
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regulator
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rtc Merge git://git.kernel.org/pub/scm/linux/kernel/git/lethal/sh-2.6 2008-10-23 10:20:15 -07:00
s390 Merge branch 'v28-range-hrtimers-for-linus-v2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 2008-10-23 10:53:02 -07:00
sbus
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scsi Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2008-10-23 13:02:03 -07:00
serial 8250: Add more OxSemi devices 2008-10-23 09:35:18 -07:00
sh
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sn
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spi Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core-2.6 2008-10-16 12:40:26 -07:00
ssb
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staging staging: pcc_acpi: delete obsolete driver 2008-10-23 15:31:09 -04:00
tc
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telephony phonedev: remove BKL 2008-10-20 08:52:36 -07:00
thermal
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uio Merge branch 'bkl-removal' of git://git.lwn.net/linux-2.6 2008-10-20 13:42:14 -07:00
usb Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6 2008-10-23 10:09:50 -07:00
uwb uwb: wrong sizeof argument in mac address compare 2008-10-20 14:37:53 +01:00
video Merge branch 'for-linus' of master.kernel.org:/home/rmk/linux-2.6-arm 2008-10-23 16:06:49 -07:00
virtio
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w1 x86: sysfs: kill owner field from attribute 2008-10-20 08:52:42 -07:00
watchdog watchdog: Fix warning 2008-10-23 09:19:47 -07:00
xen x86, um: ... and asm-x86 move 2008-10-22 22:55:20 -07:00
zorro
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Kconfig Merge branch 'master' into for-upstream 2008-10-20 16:07:19 +01:00
Makefile Merge branch 'for-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/dvrabel/uwb 2008-10-26 16:35:46 -07:00