Comment 62 for bug 1006690

Linux version 3.5.0-15-generic (root@tangerine) (gcc version 4.7.1 (Ubuntu/Linaro 4.7.1-9ubuntu2) ) #20~lp1006690v1 SMP Tue Sep 18 15:45:39 UTC 2012 (Ubuntu 3.5.0-15.20~lp1006690v1-generic 3.5.4)

no sound at all. not even alsamixer sees any devices. and this fault in dmesg :

[ 23.550249] snd_hda_intel 0000:00:1b.0: irq 43 for MSI/MSI-X
[ 23.629710] BUG: unable to handle kernel NULL pointer dereference at 0000000000000460
[ 23.629834] IP: [<ffffffffa0437026>] alc_auto_parse_customize_define+0x16/0x150 [snd_hda_codec_realtek]
[ 23.629922] PGD 12f422067 PUD 12f423067 PMD 0
[ 23.629988] Oops: 0000 [#1] SMP
[ 23.630040] CPU 0
[ 23.630060] Modules linked in: snd_hda_codec_realtek snd_hda_intel(+) joydev uvcvideo snd_hda_codec snd_hwdep i915 videobuf2_core snd_pcm snd_seq_midi snd_rawmidi arc4 snd_seq_midi_event
snd_seq videodev brcmsmac videobuf2_vmalloc snd_timer videobuf2_memops mac80211 snd_seq_device drm_kms_helper brcmutil snd kvm_intel kvm psmouse soundcore cfg80211 drm wmi snd_page_alloc serio_raw cordic bcma microcode lpc_ich i2c_algo_bit mac_hid video intel_ips mei coretemp atl1c
[ 23.630718]
[ 23.630730] Pid: 359, comm: modprobe Not tainted 3.5.0-15-generic #20~lp1006690v1 Acer Aspire xxxx/JV10_CS
[ 23.630828] RIP: 0010:[<ffffffffa0437026>] [<ffffffffa0437026>] alc_auto_parse_customize_define+0x16/0x150 [snd_hda_codec_realtek]
[ 23.630926] RSP: 0018:ffff88012f52fb48 EFLAGS: 00010292
[ 23.630972] RAX: ffffffffa043e950 RBX: 0000000000000000 RCX: 0000000000000000
[ 23.631030] RDX: 0000000000000007 RSI: 0000000000000000 RDI: ffff88012fbae000
[ 23.631087] RBP: ffff88012f52fb58 R08: ffff880137c16740 R09: ffff88012de65d20
[ 23.631143] R10: ffffea0004b67b40 R11: ffffffff8106ce24 R12: ffff88012fbae000
[ 23.631199] R13: ffff88012fbae000 R14: 00000000ffffffff R15: ffffffffa0444000
[ 23.631256] FS: 00007f124fb85700(0000) GS:ffff880137c00000(0000) knlGS:0000000000000000
[ 23.631321] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 23.631368] CR2: 0000000000000460 CR3: 000000012fbe3000 CR4: 00000000000007f0
[ 23.631425] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[ 23.631482] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
[ 23.631539] Process modprobe (pid: 359, threadinfo ffff88012f52e000, task ffff88012d4e4500)
[ 23.631603] Stack:
[ 23.634055] ffff88012fbae000 0000000000000001 ffff88012f52fb88 ffffffffa043e96a
[ 23.636552] ffff88012f52fb88 ffffffffa0442088 0000000000000001 ffff88012fbae000
[ 23.639081] ffff88012f52fbf8 ffffffffa03fc456 000288012f52fbf8 2d6164682d646e73
[ 23.641595] Call Trace:
[ 23.644069] [<ffffffffa043e96a>] patch_alc269+0x1a/0x2d0 [snd_hda_codec_realtek]
[ 23.646572] [<ffffffffa03fc456>] snd_hda_codec_configure+0x146/0x440 [snd_hda_codec]
[ 23.649087] [<ffffffffa01e49b5>] azx_probe_continue+0x297/0x37c [snd_hda_intel]
[ 23.651605] [<ffffffffa01e32d0>] ? azx_get_response+0x280/0x280 [snd_hda_intel]
[ 23.654124] [<ffffffffa01e3050>] ? azx_irq_pending_work+0x150/0x150 [snd_hda_intel]
[ 23.656642] [<ffffffffa01e39c0>] ? azx_dev_free+0x20/0x20 [snd_hda_intel]
[ 23.659182] [<ffffffffa01e2e70>] ? azx_resume+0x120/0x120 [snd_hda_intel]
[ 23.661720] [<ffffffffa01e2cd0>] ? azx_init_chip+0x290/0x290 [snd_hda_intel]
[ 23.664241] [<ffffffffa01e41f2>] azx_probe+0x638/0x692 [snd_hda_intel]
[ 23.666781] [<ffffffff8135a86c>] local_pci_probe+0x5c/0xd0
[ 23.669294] [<ffffffff8135aa01>] pci_device_probe+0x121/0x130
[ 23.671799] [<ffffffff8141fa4e>] driver_probe_device+0x7e/0x220
[ 23.674293] [<ffffffff8141fc9b>] __driver_attach+0xab/0xb0
[ 23.676792] [<ffffffff8141fbf0>] ? driver_probe_device+0x220/0x220
[ 23.679306] [<ffffffff8141dd05>] bus_for_each_dev+0x55/0x90
[ 23.681821] [<ffffffffa0430000>] ? 0xffffffffa042ffff
[ 23.684321] [<ffffffff8141f44e>] driver_attach+0x1e/0x20
[ 23.686811] [<ffffffff8141f108>] bus_add_driver+0x198/0x270
[ 23.689306] [<ffffffffa0430000>] ? 0xffffffffa042ffff
[ 23.691796] [<ffffffff81420367>] driver_register+0x77/0x150
[ 23.694272] [<ffffffffa0430000>] ? 0xffffffffa042ffff
[ 23.696710] [<ffffffff8135969f>] __pci_register_driver+0x5f/0xe0
[ 23.699127] [<ffffffffa0430000>] ? 0xffffffffa042ffff
[ 23.701552] [<ffffffffa043001e>] azx_driver_init+0x1e/0x1000 [snd_hda_intel]
[ 23.703983] [<ffffffff8100212a>] do_one_initcall+0x12a/0x180
[ 23.706334] [<ffffffff810b5c72>] sys_init_module+0xc2/0x230
[ 23.708626] [<ffffffff81689cad>] system_call_fastpath+0x1a/0x1f
[ 23.710840] Code: ff ff 31 c0 90 e9 dc fe ff ff 66 66 2e 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 54 53 66 66 66 66 90 48 8b 9f c0 00 00 00 49 89 fc <0f> b6 8b 60 04 00 00 83 c9 01 f6 c1 10
 88 8b 60 04 00 00 74 5d
[ 23.716165] RIP [<ffffffffa0437026>] alc_auto_parse_customize_define+0x16/0x150 [snd_hda_codec_realtek]
[ 23.718602] RSP <ffff88012f52fb48>
[ 23.720965] CR2: 0000000000000460
[ 23.723420] ---[ end trace 3b543704a6293369 ]---

It seems that the patch can not be reverted in easy way.