ay 02 19:56:26 hostname kernel: WARNING: CPU: 0 PID: 0 at
/build/buildd/linux-3.19.0/drivers/iommu/dmar.c:829
warn_invalid_dmar+0x7c/0x90()
May 02 19:56:26 hostname kernel: Your BIOS is broken; DMAR reported at address
0!
BIOS vendor: American Megatrends Inc.; Ver:
UX31LAA.211; Product Version: 1.0
May 02 19:56:26 hostname kernel: Modules linked in:
May 02 19:56:26 hostname kernel: CPU: 0 PID: 0 Comm: swapper Not tainted
3.19.0-15-generic #15-Ubuntu
May 02 19:56:26 hostname kernel: Hardware name: ASUSTeK COMPUTER INC.
UX31LAA/UX31LAA, BIOS UX31LAA.211 06/23/2014
May 02 19:56:26 hostname kernel: ffffffff81b0d380 ffffffff81c03d18
ffffffff817c2205 000000000000172e
May 02 19:56:26 hostname kernel: ffffffff81c03d68 ffffffff81c03d58
ffffffff8107595a 0000000000001000
May 02 19:56:26 hostname kernel: 0000000000000000 ffffffff81ac9c98
ffffffff81fe401c ffffffff81fe4054
May 02 19:56:26 hostname kernel: Call Trace:
May 02 19:56:26 hostname kernel: [<ffffffff817c2205>] dump_stack+0x45/0x57
May 02 19:56:26 hostname kernel: [<ffffffff8107595a>]
warn_slowpath_common+0x8a/0xc0
May 02 19:56:26 hostname kernel: [<ffffffff81075a1f>]
warn_slowpath_fmt_taint+0x3f/0x50
May 02 19:56:26 hostname kernel: [<ffffffff81d5e784>] ?
__acpi_map_table+0x13/0x18
May 02 19:56:26 hostname kernel: [<ffffffff817ba057>] ?
acpi_os_map_iomem+0x27/0x153
May 02 19:56:26 hostname kernel: [<ffffffff814f105c>]
warn_invalid_dmar+0x7c/0x90
May 02 19:56:26 hostname kernel: [<ffffffff817ba191>] ?
acpi_os_map_memory+0xe/0x10
May 02 19:56:26 hostname kernel: [<ffffffff817baa1c>]
dmar_validate_one_drhd+0xcc/0xf0
May 02 19:56:26 hostname kernel: [<ffffffff814f1202>]
dmar_walk_remapping_entries+0x92/0x1d0
May 02 19:56:26 hostname kernel: [<ffffffff81d9cf7a>]
detect_intel_iommu+0x52/0xd1
May 02 19:56:26 hostname kernel: [<ffffffff817ba950>] ?
xen_swiotlb_init+0x4b0/0x4b0
May 02 19:56:26 hostname kernel: [<ffffffff81d57786>] pci_iommu_alloc+0x4b/0x6e
May 02 19:56:26 hostname kernel: [<ffffffff81d67f22>] mem_init+0x17/0x9d
May 02 19:56:26 hostname kernel: [<ffffffff81d4cd92>] start_kernel+0x246/0x48f
May 02 19:56:26 hostname kernel: [<ffffffff81d4c120>] ?
early_idt_handlers+0x120/0x120
May 02 19:56:26 hostname kernel: [<ffffffff81d4c4d7>]
x86_64_start_reservations+0x2a/0x2c
May 02 19:56:26 hostname kernel: [<ffffffff81d4c61c>]
x86_64_start_kernel+0x143/0x152
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https://bugs.launchpad.net/bugs/1451080
Title:
[UX31LAA, Conexant CX20751/2, Speaker, Internal] Pulseaudio fails to
detect card
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