On Thu, 30 Jan 2014, Dave Airlie wrote: > git://people.freedesktop.org/~airlied/linux drm-next [ ... snip ... ] > Daniel Vetter (59): [ ... snip ... ] > drm/i915: dp aux irq support for g4x/vlv This commit causes all kinds of havoc on my ThinkPad x200s. It results in irq 16: nobody cared (try booting with the "irqpoll" option) CPU: 0 PID: 0 Comm: swapper/0 Not tainted 3.12.0-00854-g4aeebd7 #1 Hardware name: LENOVO 7470BN2/7470BN2, BIOS 6DET38WW (2.02 ) 12/19/2008 ffff8800795186c0 ffff88007c203e08 ffffffff81582503 ffff88007c203e38 ffffffff810a6a98 ffff88007c203e88 ffff880079518600 0000000000000000 0000000000000010 ffff88007c203e78 ffffffff810a6d43 00000010ffc4af9d Call Trace: <IRQ> [<ffffffff81582503>] dump_stack+0x7a/0x97 [<ffffffff810a6a98>] __report_bad_irq+0x38/0xf0 [<ffffffff810a6d43>] note_interrupt+0x1f3/0x240 [<ffffffff810a42d2>] handle_irq_event_percpu+0x142/0x220 [<ffffffff810a43f9>] handle_irq_event+0x49/0x70 [<ffffffff810a7561>] handle_fasteoi_irq+0x61/0x100 [<ffffffff81004a89>] handle_irq+0x59/0x150 [<ffffffff81052b6e>] ? _local_bh_enable+0xe/0x10 [<ffffffff81052bf1>] ? irq_enter+0x81/0x90 [<ffffffff8100403b>] do_IRQ+0x5b/0xe0 [<ffffffff81588aaf>] common_interrupt+0x6f/0x6f <EOI> [<ffffffff81588b5c>] ? retint_restore_args+0xe/0xe [<ffffffff8146c767>] ? poll_idle+0x47/0x90 [<ffffffff8146c740>] ? poll_idle+0x20/0x90 [<ffffffff810acd96>] ? ktime_get+0x56/0xd0 [<ffffffff8146c7f0>] cpuidle_enter_state+0x40/0xd0 [<ffffffff8146cc0a>] cpuidle_idle_call+0x10a/0x160 [<ffffffff8100b7b9>] arch_cpu_idle+0x9/0x30 [<ffffffff810a370b>] cpu_idle_loop+0x8b/0x270 [<ffffffff810a390e>] cpu_startup_entry+0x1e/0x20 [<ffffffff8157a0c3>] rest_init+0xd3/0xe0 [<ffffffff81579ff0>] ? csum_partial_copy_generic+0x170/0x170 [<ffffffff81ad905c>] start_kernel+0x3b3/0x461 [<ffffffff81ad8a96>] ? repair_env_string+0x58/0x58 [<ffffffff81ad84d1>] x86_64_start_reservations+0x1b/0x32 [<ffffffff81ad8622>] x86_64_start_kernel+0x13a/0x141 handlers: [<ffffffffa00acbc0>] usb_hcd_irq [usbcore] Disabling IRQ #16 and things go south afterwards (the machine hangs randomly, I/O is horribly slow, etc etc). This is the same machine that was the reason for commit c12aba5aa0e60b7947bc8b6ea25ef55c4acf81a4 Author: Jiri Kosina <jkosina@xxxxxxx> Date: Tue Mar 19 09:56:57 2013 +0100 drm/i915: stop using GMBUS IRQs on Gen4 chips back then in 3.9 timeframe, so it might be somehow related. It's, at the end of the day, again IRQ 16 -- and see the changelog of c12aba5a why this is rather mysterious (IRQ 16 is assigned to the card when it's not using MSI, but it *is* in fact using MSI in all the cases). -- Jiri Kosina SUSE Labs _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
