I hope somebody else will have a headache less with this:
diff ac97_patch.c.original ac97_patch.c
2725a2726
> ac97->subsystem_device == 0x0471 || /* MSI L720 laptop */
aplied to alsa-driver-1.0.14rc3.tar.bz2
And if anyone want to see:
# lspci
00:00.0 Host bridge: Intel Corporation Mobile 915GM/PM/GMS/910GML Express Processor to DRAM Controller (rev 04)
00:02.0 VGA compatible controller: Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller (rev 04)
00:02.1 Display controller: Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) PCI Express Port 1 (rev 04)
00: 1d.0 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #1 (rev 04)
00:1d.1 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #2 (rev 04)
00:1d.2 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB UHCI #3 (rev 04)
00:1d.7 USB Controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) USB2 EHCI Controller (rev 04)
00:1e.0 PCI bridge: Intel Corporation 82801 Mobile PCI Bridge (rev d4)
00:1e.2 Multimedia audio controller: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) AC'97 Audio Controller (rev 04)
00:1e.3 Modem: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) AC'97 Modem Controller (rev 04)
00:1f.0 ISA bridge: Intel Corporation 82801FBM (ICH6M) LPC Interface Bridge (rev 04)
00:1f.1 IDE interface: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) IDE Controller (rev 04)
00:1f.3 SMBus: Intel Corporation 82801FB/FBM/FR/FW/FRW (ICH6 Family) SMBus Controller (rev 04)
03:03.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10)
03:05.0 CardBus bridge: O2 Micro, Inc. OZ711MP1/MS1 MemoryCardBus Controller (rev 21)
03:05.2 Class 0805: O2 Micro, Inc. Integrated MMC/SD Controller (rev 01)
03:05.3 Bridge: O2 Micro, Inc. Integrated MS/xD Controller (rev 01)
03:05.4 FireWire (IEEE 1394): O2 Micro, Inc. Firewire (IEEE 1394) (rev 02)
03:09.0 Network controller: RaLink RT2561/RT61 rev B 802.11g
# lspci -nv
00:00.0 0600: 8086:2590 (rev 04)
Subsystem: 1462:0161
Flags: bus master, fast devsel, latency 0
Capabilities: [e0] Vendor Specific Information
00:02.0 0300: 8086:2592 (rev 04)
Subsystem: 1462:0161
Flags: bus master, fast devsel, latency 0, IRQ 169
Memory at 22000000 (32-bit, non-prefetchable) [size=512K]
I/O ports at 14a0 [size=8]
Memory at d0000000 (32-bit, prefetchable) [size=256M]
Memory at 22080000 (32-bit, non-prefetchable) [size=256K]
Capabilities: [d0] Power Management version 2
00:02.1 0380: 8086:2792 (rev 04)
Subsystem: 1462:0161
Flags: bus master, fast devsel, latency 0
Memory at fbd80000 (32-bit, non-prefetchable) [size=512K]
Capabilities: [d0] Power Management version 2
00: 1c.0 0604: 8086:2660 (rev 04)
Flags: bus master, fast devsel, latency 0
Bus: primary=00, secondary=01, subordinate=02, sec-latency=0
I/O behind bridge: 0000d000-0000dfff
Memory behind bridge: fbe00000-fbefffff
Capabilities: [40] Express Root Port (Slot+) IRQ 0
Capabilities: [80] Message Signalled Interrupts: 64bit- Queue=0/0 Enable+
Capabilities: [90] #0d [0000]
Capabilities: [a0] Power Management version 2
Capabilities: [100] Virtual Channel
Capabilities: [180] Unknown (5)
00:1d.0 0c03: 8086:2658 (rev 04)
Subsystem: 1462:0161
Flags: bus master, medium devsel, latency 0, IRQ 217
I/O ports at 1440 [size=32]
00:1d.1 0c03: 8086:2659 (rev 04)
Subsystem: 1462:0161
Flags: bus master, medium devsel, latency 0, IRQ 177
I/O ports at 1460 [size=32]
00:1d.2 0c03: 8086:265a (rev 04)
Subsystem: 1462:0161
Flags: bus master, medium devsel, latency 0, IRQ 209
I/O ports at 1480 [size=32]
00:1d.7 0c03: 8086:265c (rev 04) (prog-if 20)
Subsystem: 1462:0161
Flags: bus master, medium devsel, latency 0, IRQ 217
Memory at 220c0000 (32-bit, non-prefetchable) [size=1K]
Capabilities: [50] Power Management version 2
Capabilities: [58] Debug port
00:1e.0 0604: 8086:2448 (rev d4) (prog-if 01)
Flags: bus master, fast devsel, latency 0
Bus: primary=00, secondary=03, subordinate=05, sec-latency=32
I/O behind bridge: 0000e000-0000efff
Memory behind bridge: fbf00000-fbffffff
Prefetchable memory behind bridge: 0000000020000000-0000000021f00000
Capabilities: [50] #0d [0000]
00:1e.2 0401: 8086:266e (rev 04)
Subsystem: 1462:0471
Flags: bus master, medium devsel, latency 0, IRQ 233
I/O ports at 1000 [size=256]
I/O ports at 1400 [size=64]
Memory at 220c0400 (32-bit, non-prefetchable) [size=512]
Memory at 220c0600 (32-bit, non-prefetchable) [size=256]
Capabilities: [50] Power Management version 2
00:1e.3 0703: 8086:266d (rev 04)
Subsystem: 1462:0121
Flags: medium devsel, IRQ 201
I/O ports at c800 [size=256]
I/O ports at cc00 [size=128]
Capabilities: [50] Power Management version 2
00:1f.0 0601: 8086:2641 (rev 04)
Subsystem: 1462:0161
Flags: bus master, medium devsel, latency 0
00:1f.1 0101: 8086:266f (rev 04) (prog-if 8a)
Subsystem: 1462:0161
Flags: bus master, medium devsel, latency 0, IRQ 209
I/O ports at <unassigned>
I/O ports at <unassigned>
I/O ports at <unassigned>
I/O ports at <unassigned>
I/O ports at ffa0 [size=16]
00:1f.3 0c05: 8086:266a (rev 04)
Subsystem: 1462:0161
Flags: medium devsel, IRQ 7
I/O ports at c480 [size=32]
03:03.0 0200: 10ec:8139 (rev 10)
Subsystem: 1462:0161
Flags: bus master, medium devsel, latency 64, IRQ 225
I/O ports at e800 [size=256]
Memory at fbfffc00 (32-bit, non-prefetchable) [size=256]
Capabilities: [50] Power Management version 2
03:05.0 0607: 1217:7134 (rev 21)
Subsystem: 1462:0161
Flags: bus master, slow devsel, latency 64, IRQ 177
Memory at fbf00000 (32-bit, non-prefetchable) [size=4K]
Bus: primary=03, secondary=04, subordinate=04, sec-latency=176
Memory window 0: 20000000-21fff000 (prefetchable)
Memory window 1: 24000000-25fff000
I/O window 0: 0000e000-0000e0ff
I/O window 1: 0000e400-0000e4ff
16-bit legacy interface ports at 0001
03:05.2 0805: 1217:7120 (rev 01)
Subsystem: 1462:0161
Flags: slow devsel, IRQ 5
Memory at fbfff800 (32-bit, non-prefetchable) [size=256]
Capabilities: [a0] Power Management version 2
03:05.3 0680: 1217:7130 (rev 01)
Subsystem: 1462:0161
Flags: slow devsel, IRQ 5
Memory at fbffe000 (32-bit, non-prefetchable) [size=4K]
Capabilities: [a0] Power Management version 2
03:05.4 0c00: 1217:00f7 (rev 02) (prog-if 10)
Subsystem: 1217:00f7
Flags: bus master, medium devsel, latency 64, IRQ 177
Memory at fbffd000 (32-bit, non-prefetchable) [size=4K]
Memory at fbfff000 (32-bit, non-prefetchable) [size=2K]
Capabilities: [60] Power Management version 2
03:09.0 0280: 1814:0302
Subsystem: 1462:b833
Flags: bus master, slow devsel, latency 64, IRQ 7
Memory at fbff0000 (32-bit, non-prefetchable) [size=32K]
Capabilities: [40] Power Management version 2
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