thinkpad x250 cracking sound on start

[Nicolas]

Since the upgrade to the wily beta from vivid I get a cracking sound each time the first sound is played (e.g. the starting sound) on my Thinkpad X250.
This did not happen with Ubuntu Vivid.

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: ubuntu-release-upgrader-core 1:15.10.10
ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
Uname: Linux 4.2.0-16-generic x86_64
ApportVersion: 2.19.1-0ubuntu2
Architecture: amd64
CrashDB: ubuntu
CurrentDesktop: KDE
Date: Wed Oct 14 15:51:03 2015
InstallationDate: Installed on 2015-02-27 (229 days ago)
InstallationMedia: It
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: dist-upgrade
UpgradeStatus: Upgraded to wily on 2015-09-25 (19 days ago)

[Raymond (superquad-vortex2)]

14 15:39:53 username-x250 kernel: WARNING: CPU: 0 PID: 1 at /build/linux-AxjFAn/linux-4.2.0/arch/x86/mm/ioremap.c:198 __ioremap_caller+0x2c5/0x380()
Okt 14 15:39:53 username-x250 kernel: Modules linked in:
Okt 14 15:39:53 username-x250 kernel:
Okt 14 15:39:53 username-x250 kernel: CPU: 0 PID: 1 Comm: swapper/0 Not tainted 4.2.0-16-generic #19-Ubuntu
Okt 14 15:39:53 username-x250 kernel: Hardware name: LENOVO 20CLS06D00/20CLS06D00, BIOS N10ET33W (1.12 ) 04/06/2015
Okt 14 15:39:53 username-x250 kernel: 0000000000000000 00000000a86aafda ffff880244587ab8 ffffffff817e8c09
Okt 14 15:39:53 username-x250 kernel: 0000000000000000 ffff880244587b10 ffff880244587af8 ffffffff8107b3c6
Okt 14 15:39:53 username-x250 kernel: ffff880244587b28 00000000fed10000 ffffc90000e88000 0000000000006000
Okt 14 15:39:53 username-x250 kernel: Call Trace:
Okt 14 15:39:53 username-x250 kernel: [<ffffffff817e8c09>] dump_stack+0x45/0x57
Okt 14 15:39:53 username-x250 kernel: [<ffffffff8107b3c6>] warn_slowpath_common+0x86/0xc0
Okt 14 15:39:53 username-x250 kernel: [<ffffffff8107b455>] warn_slowpath_fmt+0x55/0x70
Okt 14 15:39:53 username-x250 kernel: [<ffffffff81067c25>] __ioremap_caller+0x2c5/0x380
Okt 14 15:39:53 username-x250 kernel: [<ffffffff81067cf7>] ioremap_nocache+0x17/0x20
Okt 14 15:39:53 username-x250 kernel: [<ffffffff8103a869>] snb_uncore_imc_init_box+0x79/0xb0
Okt 14 15:39:53 username-x250 kernel: [<ffffffff81038f86>] uncore_pci_probe+0xd6/0x1c0
Okt 14 15:39:53 username-x250 kernel: [<ffffffff81414c25>] local_pci_probe+0x45/0xa0
Okt 14 15:39:53 username-x250 kernel: [<ffffffff81415d24>] ? pci_match_device+0xf4/0x120
Okt 14 15:39:53 username-x250 kernel: [<ffffffff81415e83>] pci_device_probe+0xf3/0x140
Okt 14 15:39:53 username-x250 kernel: [<ffffffff81520b0a>] driver_probe_device+0x21a/0x490
Okt 14 15:39:53 username-x250 kernel: [<ffffffff81520e10>] __driver_attach+0x90/0xa0
Okt 14 15:39:53 username-x250 kernel: [<ffffffff81520d80>] ? driver_probe_device+0x490/0x490
Okt 14 15:39:53 username-x250 kernel: [<ffffffff8151e6ac>] bus_for_each_dev+0x6c/0xc0
Okt 14 15:39:53 username-x250 kernel: [<ffffffff815202ae>] driver_attach+0x1e/0x20
Okt 14 15:39:53 username-x250 kernel: [<ffffffff8151fddb>] bus_add_driver+0x1eb/0x280
Okt 14 15:39:53 username-x250 kernel: [<ffffffff81d5f144>] ? uncore_cpu_setup+0x12/0x12
Okt 14 15:39:53 username-x250 kernel: [<ffffffff815216b0>] driver_register+0x60/0xe0
Okt 14 15:39:53 username-x250 kernel: [<ffffffff814144dc>] __pci_register_driver+0x4c/0x50
Okt 14 15:39:53 username-x250 kernel: [<ffffffff81d5f227>] intel_uncore_init+0xe3/0x2d8
Okt 14 15:39:53 username-x250 kernel: [<ffffffff81d5f144>] ? uncore_cpu_setup+0x12/0x12
Okt 14 15:39:53 username-x250 kernel: [<ffffffff81002123>] do_one_initcall+0xb3/0x200
Okt 14 15:39:53 username-x250 kernel: [<ffffffff81099de4>] ? parse_args+0x154/0x4a0
Okt 14 15:39:53 username-x250 kernel: [<ffffffff81d501c1>] kernel_init_freeable+0x17b/0x21a
Okt 14 15:39:53 username-x250 kernel: [<ffffffff817dd170>] ? rest_init+0x80/0x80
Okt 14 15:39:53 username-x250 kernel: [<ffffffff817dd17e>] kernel_init+0xe/0xe0
Okt 14 15:39:53 username-x250 kernel: [<ffffffff817efe1f>] ret_from_fork+0x...

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Dougie (doug+launchpad-idmf)]

Looks like this may be caused by kernel change to improve power saving.

See https://bugzilla.suse.com/show_bug.cgi?id=943982#c8 for a fix

And a patch to the kernel: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=7f57d803ee03730d570dc59a9e3e4842b58dd5cc

[Dougie (doug+launchpad-idmf)]

If you're doing the workaround shown in https://bugzilla.suse.com/show_bug.cgi?id=943982#c8 then for the x250 the codec section should be:

0x10ec0292 0x17aa2226 0