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It seems wifi does not work with multiboot. Following errors are written by dmesg (I've tried 2.6.38-1000-ac100 and 3.0.8-4-ac100 kernels from Ubuntu): Feb 11 19:35:07 eyusupov-ac100 kernel: [ 2.080084] tegra-ehci tegra-ehci.2: USB 2.0 started, EHCI 1.00 Feb 11 19:35:07 eyusupov-ac100 kernel: [ 2.367615] irq 129: nobody cared (try booting with the “irqpoll” option) Feb 11 19:35:07 eyusupov-ac100 kernel: [ 2.367807] Backtrace: Feb 11 19:35:07 eyusupov-ac100 kernel: [ 2.367900] [<c0042e60>] (unwind_backtrace+0x0/0xe0) from [<c0407444>] (report_bad_irq+0x34/0x8c) Feb 11 19:35:07 eyusupov-ac100 kernel: [ 2.368162] [<c0407444>] (report_bad_irq+0x34/0x8c) from [<c00b7640>] (note_interrupt+0x148/0x1d8) Feb 11 19:35:07 eyusupov-ac100 kernel: [ 2.368418] [<c00b7640>] (note_interrupt+0x148/0x1d8) from [<c00b7c64>] (handle_level_irq+0xfc/0x160) Feb 11 19:35:07 eyusupov-ac100 kernel: [ 2.368678] [<c00b7c64>] (handle_level_irq+0xfc/0x160) from [<c0036088>] (asm_do_IRQ+0x88/0xc8) Feb 11 19:35:07 eyusupov-ac100 kernel: [ 2.368924] [<c0036088>] (asm_do_IRQ+0x88/0xc8) from [<c04149ec>] (irq_svc+0x4c/0xe4) Feb 11 19:35:07 eyusupov-ac100 kernel: [ 2.369143] Exception stack(0xdb843df8 to 0xdb843e40) Feb 11 19:35:07 eyusupov-ac100 kernel: [ 2.369286] 3de0: 00000000 00000000 Feb 11 19:35:07 eyusupov-ac100 kernel: [ 2.369516] 3e00: 00000000 c0609dc0 db842000 00000000 00000282 00000001 00000000 db842000 Feb 11 19:35:07 eyusupov-ac100 kernel: [ 2.369746] 3e20: 00000000 0000000a 0000000c db843e40 c0076ee4 c0076ef8 20000113 ffffffff Feb 11 19:35:07 eyusupov-ac100 kernel: [ 2.374697] [<c04149ec>] (irq_svc+0x4c/0xe4) from [<c0076ef8>] (do_softirq+0x50/0x250) Feb 11 19:35:07 eyusupov-ac100 kernel: [ 2.379666] [<c0076ef8>] (do_softirq+0x50/0x250) from [<c0077530>] (irq_exit+0x48/0xa0) Feb 11 19:35:07 eyusupov-ac100 kernel: [ 2.384640] [<c0077530>] (irq_exit+0x48/0xa0) from [<c0036290>] (do_local_timer+0x58/0x84) Feb 11 19:35:07 eyusupov-ac100 kernel: [ 2.389630] [<c0036290>] (do_local_timer+0x58/0x84) from [<c04149ec>] (irq_svc+0x4c/0xe4) Feb 11 19:35:07 eyusupov-ac100 kernel: [ 2.394712] Exception stack(0xdb843e90 to 0xdb843ed8) Feb 11 19:35:07 eyusupov-ac100 kernel: [ 2.399758] 3e80: db2c4400 00000000 db2c4800 00000268 Feb 11 19:35:07 eyusupov-ac100 kernel: [ 2.404914] 3ea0: db2c4400 00000081 00000080 00000000 db2c44b0 00000002 00000000 00000000 Feb 11 19:35:07 eyusupov-ac100 kernel: [ 2.410097] 3ec0: 00002ebc db843ed8 c02cc470 c02cb28c 80000013 ffffffff Feb 11 19:35:07 eyusupov-ac100 kernel: [ 2.404914] 3ea0: db2c4400 00000081 00000080 00000000 db2c44b0 00000002 00000000 00000000 Feb 11 19:35:07 eyusupov-ac100 kernel: [ 2.410097] 3ec0: 00002ebc db843ed8 c02cc470 c02cb28c 80000013 ffffffff Feb 11 19:35:07 eyusupov-ac100 kernel: [ 2.415343] [<c04149ec>] (irq_svc+0x4c/0xe4) from [<c02cb28c>] (register_root_hub+0x0/0x118) Feb 11 19:35:07 eyusupov-ac100 kernel: [ 2.420733] [<c02cb28c>] (register_root_hub+0x0/0x118) from [<c05b0be8>] (0xc05b0be8) Feb 11 19:35:07 eyusupov-ac100 kernel: [ 2.426124] handlers: Feb 11 19:35:07 eyusupov-ac100 kernel: [ 2.431394] [<c02cb3a4>] (usb_hcd_irq+0x0/0x6c) Feb 11 19:35:07 eyusupov-ac100 kernel: [ 2.436787] Disabling IRQ #129 Feb 11 19:35:07 eyusupov-ac100 kernel: [ 2.442725] tegra-ehci tegra-ehci.2: USB bus 2 deregistered Feb 11 19:35:07 eyusupov-ac100 kernel: [ 2.442740] tegra-ehci tegra-ehci.2: Failed to add USB HCD Feb 11 19:35:07 eyusupov-ac100 kernel: [ 2.448087] tegra-ehci: probe of tegra-ehci.2 failed with error -108 After removing multiboot wifi works fine again.