[Galaxy Tab 10.1 Android Development] FCKöln:
I was comparing a cm11 kernel log to a cm12.1 kernel log and it seems that cm11 raises an exception when changing baud rate.

This is from cm11 where the keyboard keys works. I am wondering why there are three empty lines in the cm12.1 log (garbage?)

<6>[ 28.338021] [Keyboard] console uart path is switched to AP.
<6>[ 28.338277] [Keyboard] baud : 9600, quot: 1406
<3>[ 28.485893] irq 69: nobody cared (try booting with the "irqpoll" option)
<4>[ 28.486263] [<c001328c>] (unwind_backtrace+0x0/0xe0) from [<c008da94>] (__report_bad_irq+0x24/0xb8)
<4>[ 28.486496] [<c008da94>] (__report_bad_irq+0x24/0xb8) from [<c008dd78>] (note_interrupt+0x198/0x248)
<4>[ 28.486664] [<c008dd78>] (note_interrupt+0x198/0x248) from [<c008c36c>] (handle_irq_event_percpu+0x244/0x274)
<4>[ 28.486895] [<c008c36c>] (handle_irq_event_percpu+0x244/0x274) from [<c008c3d8>] (handle_irq_event+0x3c/0x5c)
<4>[ 28.487127] [<c008c3d8>] (handle_irq_event+0x3c/0x5c) from [<c008e720>] (handle_fasteoi_irq+0xd4/0x10c)
<4>[ 28.487359] [<c008e720>] (handle_fasteoi_irq+0xd4/0x10c) from [<c008bb1c>] (generic_handle_irq+0x2c/0x40)
<4>[ 28.487599] [<c008bb1c>] (generic_handle_irq+0x2c/0x40) from [<c000e0f4>] (handle_IRQ+0x78/0xb8)
<4>[ 28.487833] [<c000e0f4>] (handle_IRQ+0x78/0xb8) from [<c000d3f8>] (__irq_svc+0x38/0xd0)
<4>[ 28.488011] [<c000d3f8>] (__irq_svc+0x38/0xd0) from [<c00507d0>] (__do_softirq+0x54/0x254)
<4>[ 28.488242] [<c00507d0>] (__do_softirq+0x54/0x254) from [<c0050e30>] (irq_exit+0x4c/0xa8)
<4>[ 28.488470] [<c0050e30>] (irq_exit+0x4c/0xa8) from [<c000830c>] (do_local_timer+0x70/0xa4)
<4>[ 28.488698] [<c000830c>] (do_local_timer+0x70/0xa4) from [<c000d3f8>] (__irq_svc+0x38/0xd0)
<4>[ 28.488857] Exception stack(0xe5617ef0 to 0xe5617f38)
<4>[ 28.489081] 7ee0: c07fcc74 c07fcc74 00220021 00000001
<4>[ 28.489243] 7f00: 60000113 00000001 c096ed44 e5616000 c0804490 00000000 c0804474 00000000
<4>[ 28.489468] 7f20: 00000040 e5617f38 c05abda0 c05abda4 60000113 ffffffff
<4>[ 28.489708] [<c000d3f8>] (__irq_svc+0x38/0xd0) from [<c05abda4>] (_raw_spin_unlock_irqrestore+0x10/0x3c)
<4>[ 28.489968] [<c05abda4>] (_raw_spin_unlock_irqrestore+0x10/0x3c) from [<c008bd38>] (__irq_put_desc_unlock+0x14/0x38)
<4>[ 28.490210] [<c008bd38>] (__irq_put_desc_unlock+0x14/0x38) from [<c008d030>] (enable_irq+0x5c/0x68)
<4>[ 28.490391] [<c008d030>] (enable_irq+0x5c/0x68) from [<c02b3e6c>] (change_console_baud_rate+0x138/0x148)
<4>[ 28.490636] [<c02b3e6c>] (change_console_baud_rate+0x138/0x148) from [<c03e3cd4>] (check_keyboard_dock+0xc4/0x1b0)
<4>[ 28.490871] [<c03e3cd4>] (check_keyboard_dock+0xc4/0x1b0) from [<c03e24f8>] (acc_con_interrupt+0xb4/0x160)
<4>[ 28.491103] [<c03e24f8>] (acc_con_interrupt+0xb4/0x160) from [<c008caf8>] (irq_thread+0xd0/0x1f8)
<4>[ 28.491345] [<c008caf8>] (irq_thread+0xd0/0x1f8) from [<c0066100>] (kthread+0x7c/0x84)
<4>[ 28.491512] [<c0066100>] (kthread+0x7c/0x84) from [<c000e2d0>] (kernel_thread_exit+0x0/0x8)
<3>[ 28.491735] handlers:
<3>[ 28.491907] [<c02b3bd0>] serial8250_interrupt
<0>[ 28.492224] Disabling IRQ #69
<6>[ 28.518074] [Keyboard] Unkown key layout : 0
<6>[ 28.518345] tegra-otg tegra-otg: Acc power on detect
<6>[ 28.537994] Board P4 : tegra_acc_power token : (3,1) on
<6>[ 28.543164] [Keyboard] Unkown key layout : 0
<6>[ 28.657365] [Keyboard] UK keyboard is attacted."

Where is actually the "the uart is not ready!!!" message coming from? from some p4 keybaord driver? i can't seem to find any code...