Dropped IRQ disables Radeon 3D

[Michael Witten]

I've been randomly getting the following backtrace in dmesg for a
while now (I thought I built my kernel with debugging support and
symbols, but I guess not, so sorry if it's not that helpful); at
the time, I was running:

  v2.6.39-rc4-183-g0f1d9f7 (0f1d9f78ce41a8874d30271ef8480e6f8f7f1fce)

It only seems like my 3D acceleration is disabled as a result
of disabling the IRQ (and the IRQ number is not always the
same).

I can fix my 3D acceleration by suspending to ram and then
waking my system up again.

  [357580.931252] irq 11: nobody cared (try booting with the "irqpoll" option)
  [357580.931260] Pid: 0, comm: swapper Not tainted 2.6.39-rc4-0f1d9f78ce41a8874d30271ef8480e6f8f7f1fce-THOR-205+ #4
  [357580.931264] Call Trace:
  [357580.931276]  [<c1329df1>] ? __report_bad_irq.isra.6+0x37/0x83
  [357580.931283]  [<c12900cb>] ? snd_intel8x0_interrupt+0x4e/0x1c0
  [357580.931289]  [<c104d6a3>] ? note_interrupt+0x110/0x175
  [357580.931296]  [<c121be98>] ? tg3_interrupt_tagged+0x29/0x70
  [357580.931301]  [<c104c832>] ? handle_irq_event_percpu+0x105/0x117
  [357580.931306]  [<c104da68>] ? unmask_irq+0x1a/0x1a
  [357580.931310]  [<c104c85d>] ? handle_irq_event+0x19/0x24
  [357580.931314]  [<c104daa8>] ? handle_level_irq+0x40/0x56
  [357580.931318]  <IRQ>  [<c100358a>] ? do_IRQ+0x2e/0x81
  [357580.931327]  [<c1024510>] ? irq_exit+0x44/0x67
  [357580.931334]  [<c132e2a9>] ? common_interrupt+0x29/0x30
  [357580.931339]  [<c1024345>] ? __do_softirq+0x30/0xe5
  [357580.931343]  [<c1024315>] ? local_bh_enable+0x2/0x2
  [357580.931346]  <IRQ>  [<c10244fd>] ? irq_exit+0x31/0x67
  [357580.931353]  [<c10035ca>] ? do_IRQ+0x6e/0x81
  [357580.931360]  [<c1147dd7>] ? acpi_hw_write_port+0x22/0x83
  [357580.931365]  [<c132e2a9>] ? common_interrupt+0x29/0x30
  [357580.931371]  [<c1154f11>] ? acpi_idle_enter_bm+0x1d5/0x20a
  [357580.931378]  [<c1261150>] ? cpuidle_idle_call+0x65/0x95
  [357580.931382]  [<c1001577>] ? cpu_idle+0x23/0x3d
  [357580.931387]  [<c14dd60b>] ? start_kernel+0x263/0x268
  [357580.931392]  [<c14dd151>] ? loglevel+0x14/0x14
  [357580.931395] handlers:
  [357580.931397] [<c11bdcb4>] (radeon_driver_irq_handler_kms+0x0/0x10)
  [357580.931405] [<c122cca3>] (usb_hcd_irq+0x0/0x5e)
  [357580.931411] [<c122cca3>] (usb_hcd_irq+0x0/0x5e)
  [357580.931415] [<c121be6f>] (tg3_interrupt_tagged+0x0/0x70)
  [357580.931420] [<c129007d>] (snd_intel8x0_interrupt+0x0/0x1c0)
  [357580.931426] Disabling IRQ #11

Sincerely,
Michael Witten
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