Hi,
i have a strange problem, it has been reported for ubuntu
here (h ttp://ubuntuforums.org/showthread.php?t=934399) and here (h ttps://bugs.launchpad.net/ubuntu/+source/linux/+bug/23984)

When I shut down fedora, my laptop speaker pop (they make a sound like the power cord was plugged out before they could shut down on their own, this make a "pop" or "crack" sound which sounds like it could damage the speakers.)

My system is, fedora 15 (same problem on Fedora 14, Ubuntu 11.04).


My lspci
------------------------------------------------------------
00:00.0 Host bridge [0600]: Intel Corporation Core Processor DRAM Controller [8086:0044] (rev 02)
Subsystem: Acer Incorporated [ALI] Device [1025:036d]
Flags: bus master, fast devsel, latency 0
Capabilities: <access denied>

00:01.0 PCI bridge [0604]: Intel Corporation Core Processor PCI Express x16 Root Port [8086:0045] (rev 02) (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0
Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
I/O behind bridge: 00003000-00003fff
Memory behind bridge: b4000000-b40fffff
Prefetchable memory behind bridge: 00000000a0000000-00000000afffffff
Capabilities: <access denied>
Kernel driver in use: pcieport
Kernel modules: shpchp

00:16.0 Communication controller [0780]: Intel Corporation 5 Series/3400 Series Chipset HECI Controller [8086:3b64] (rev 06)
Subsystem: Acer Incorporated [ALI] Device [1025:036d]
Flags: bus master, fast devsel, latency 0, IRQ 10
Memory at b4106100 (64-bit, non-prefetchable) [size=16]
Capabilities: <access denied>

00:1a.0 USB Controller [0c03]: Intel Corporation 5 Series/3400 Series Chipset USB2 Enhanced Host Controller [8086:3b3c] (rev 05) (prog-if 20 [EHCI])
Subsystem: Acer Incorporated [ALI] Device [1025:036d]
Flags: bus master, medium devsel, latency 0, IRQ 16
Memory at b4105c00 (32-bit, non-prefetchable) [size=1K]
Capabilities: <access denied>
Kernel driver in use: ehci_hcd

00:1b.0 Audio device [0403]: Intel Corporation 5 Series/3400 Series Chipset High Definition Audio [8086:3b56] (rev 05)
Subsystem: Acer Incorporated [ALI] Device [1025:036d]
Flags: fast devsel, IRQ 22
Memory at b4100000 (64-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
Kernel modules: snd-hda-intel

00:1c.0 PCI bridge [0604]: Intel Corporation 5 Series/3400 Series Chipset PCI Express Root Port 1 [8086:3b42] (rev 05) (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0
Bus: primary=00, secondary=02, subordinate=02, sec-latency=0
I/O behind bridge: 00002000-00002fff
Memory behind bridge: b3000000-b3ffffff
Prefetchable memory behind bridge: 00000000b0000000-00000000b0ffffff
Capabilities: <access denied>
Kernel driver in use: pcieport
Kernel modules: shpchp

00:1c.1 PCI bridge [0604]: Intel Corporation 5 Series/3400 Series Chipset PCI Express Root Port 2 [8086:3b44] (rev 05) (prog-if 00 [Normal decode])
Flags: bus master, fast devsel, latency 0
Bus: primary=00, secondary=03, subordinate=03, sec-latency=0
I/O behind bridge: 00001000-00001fff
Memory behind bridge: b2000000-b2ffffff
Prefetchable memory behind bridge: 00000000b1000000-00000000b1ffffff
Capabilities: <access denied>
Kernel driver in use: pcieport
Kernel modules: shpchp

00:1d.0 USB Controller [0c03]: Intel Corporation 5 Series/3400 Series Chipset USB2 Enhanced Host Controller [8086:3b34] (rev 05) (prog-if 20 [EHCI])
Subsystem: Acer Incorporated [ALI] Device [1025:036d]
Flags: bus master, medium devsel, latency 0, IRQ 23
Memory at b4105800 (32-bit, non-prefetchable) [size=1K]
Capabilities: <access denied>
Kernel driver in use: ehci_hcd

00:1e.0 PCI bridge [0604]: Intel Corporation 82801 Mobile PCI Bridge [8086:2448] (rev a5) (prog-if 01 [Subtractive decode])
Flags: bus master, fast devsel, latency 0
Bus: primary=00, secondary=04, subordinate=04, sec-latency=32
Capabilities: <access denied>

00:1f.0 ISA bridge [0601]: Intel Corporation Mobile 5 Series Chipset LPC Interface Controller [8086:3b09] (rev 05)
Subsystem: Acer Incorporated [ALI] Device [1025:036d]
Flags: bus master, medium devsel, latency 0
Capabilities: <access denied>
Kernel modules: iTCO_wdt

00:1f.2 SATA controller [0106]: Intel Corporation 5 Series/3400 Series Chipset 4 port SATA AHCI Controller [8086:3b29] (rev 05) (prog-if 01 [AHCI 1.0])
Subsystem: Acer Incorporated [ALI] Device [1025:036d]
Flags: bus master, 66MHz, medium devsel, latency 0, IRQ 41
I/O ports at 4048 [size=8]
I/O ports at 4054 [size=4]
I/O ports at 4040 [size=8]
I/O ports at 4050 [size=4]
I/O ports at 4020 [size=32]
Memory at b4105000 (32-bit, non-prefetchable) [size=2K]
Capabilities: <access denied>
Kernel driver in use: ahci

00:1f.3 SMBus [0c05]: Intel Corporation 5 Series/3400 Series Chipset SMBus Controller [8086:3b30] (rev 05)
Subsystem: Acer Incorporated [ALI] Device [1025:036d]
Flags: medium devsel, IRQ 19
Memory at b4106000 (64-bit, non-prefetchable) [size=256]
I/O ports at 4000 [size=32]
Kernel modules: i2c-i801

01:00.0 VGA compatible controller [0300]: ATI Technologies Inc Manhattan [Mobility Radeon HD 5000 Series] [1002:68e0] (prog-if 00 [VGA controller])
Subsystem: Acer Incorporated [ALI] Device [1025:036d]
Flags: bus master, fast devsel, latency 0, IRQ 42
Memory at a0000000 (64-bit, prefetchable) [size=256M]
Memory at b4000000 (64-bit, non-prefetchable) [size=128K]
I/O ports at 3000 [size=256]
Expansion ROM at b4040000 [disabled] [size=128K]
Capabilities: <access denied>
Kernel driver in use: radeon
Kernel modules: radeon

01:00.1 Audio device [0403]: ATI Technologies Inc Manhattan HDMI Audio [Mobility Radeon HD 5000 Series] [1002:aa68]
Subsystem: Acer Incorporated [ALI] Device [1025:036d]
Flags: fast devsel, IRQ 17
Memory at b4020000 (64-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
Kernel modules: snd-hda-intel

02:00.0 Ethernet controller [0200]: Broadcom Corporation NetLink BCM57780 Gigabit Ethernet PCIe [14e4:1692] (rev 01)
Subsystem: Acer Incorporated [ALI] Device [1025:036d]
Flags: bus master, fast devsel, latency 0, IRQ 45
Memory at b3000000 (64-bit, non-prefetchable) [size=64K]
Capabilities: <access denied>
Kernel driver in use: tg3
Kernel modules: tg3

03:00.0 Network controller [0280]: Broadcom Corporation BCM43225 802.11b/g/n [14e4:4357] (rev 01)
Subsystem: Foxconn International, Inc. Device [105b:e021]
Flags: bus master, fast devsel, latency 0, IRQ 17
Memory at b2000000 (64-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: wl
Kernel modules: wl

ff:00.0 Host bridge [0600]: Intel Corporation Core Processor QuickPath Architecture Generic Non-core Registers [8086:2c62] (rev 02)
Subsystem: Acer Incorporated [ALI] Device [1025:036d]
Flags: bus master, fast devsel, latency 0

ff:00.1 Host bridge [0600]: Intel Corporation Core Processor QuickPath Architecture System Address Decoder [8086:2d01] (rev 02)
Subsystem: Acer Incorporated [ALI] Device [1025:036d]
Flags: bus master, fast devsel, latency 0

ff:02.0 Host bridge [0600]: Intel Corporation Core Processor QPI Link 0 [8086:2d10] (rev 02)
Subsystem: Acer Incorporated [ALI] Device [1025:036d]
Flags: bus master, fast devsel, latency 0

ff:02.1 Host bridge [0600]: Intel Corporation Core Processor QPI Physical 0 [8086:2d11] (rev 02)
Subsystem: Acer Incorporated [ALI] Device [1025:036d]
Flags: bus master, fast devsel, latency 0

ff:02.2 Host bridge [0600]: Intel Corporation Core Processor Reserved [8086:2d12] (rev 02)
Subsystem: Acer Incorporated [ALI] Device [1025:036d]
Flags: bus master, fast devsel, latency 0

ff:02.3 Host bridge [0600]: Intel Corporation Core Processor Reserved [8086:2d13] (rev 02)
Subsystem: Acer Incorporated [ALI] Device [1025:036d]
Flags: bus master, fast devsel, latency 0

----------------------------------------------------------

harkness