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SubjectRe: [Intel-gfx] [PATCH] drm/i915: Hold struct_mutex during hotplug processing
Will test tonight.

It looks like there is a lot of hotplug activity when 'xset dpms force
off' gets run. (That's not a typo. I do mean "off," not "on."

See attached trace. perf rocks, even over ssh :)

--Andy

On Mon, Jul 25, 2011 at 1:37 PM, Jesse Barnes <jbarnes@virtuousgeek.org> wrote:
> On Mon, 25 Jul 2011 10:10:29 -0700
> Keith Packard <keithp@keithp.com> wrote:
>
>> Hotplug detection is a mode setting operation and must hold the
>> struct_mutex or risk colliding with other mode setting operations.
>>
>> In particular, the display port hotplug function attempts to re-train
>> the link if the monitor is supposed to be running when plugged back
>> in. If that happens while mode setting is underway, the link will get
>> scrambled, leaving it in an inconsistent state.
>>
>> Signed-off-by: Keith Packard <keithp@keithp.com>
>> ---
>>  drivers/gpu/drm/i915/i915_irq.c |    3 +++
>>  1 files changed, 3 insertions(+), 0 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
>> index 3b03f85..5fe8f28 100644
>> --- a/drivers/gpu/drm/i915/i915_irq.c
>> +++ b/drivers/gpu/drm/i915/i915_irq.c
>> @@ -306,12 +306,15 @@ static void i915_hotplug_work_func(struct work_struct *work)
>>       struct drm_mode_config *mode_config = &dev->mode_config;
>>       struct intel_encoder *encoder;
>>
>> +     mutex_lock(&dev_priv->dev->struct_mutex);
>>       DRM_DEBUG_KMS("running encoder hotplug functions\n");
>>
>>       list_for_each_entry(encoder, &mode_config->encoder_list, base.head)
>>               if (encoder->hot_plug)
>>                       encoder->hot_plug(encoder);
>>
>> +     mutex_unlock(&dev_priv->dev->struct_mutex);
>> +
>>       /* Just fire off a uevent and let userspace tell us what to do */
>>       drm_helper_hpd_irq_event(dev);
>>  }
>
> yay, sounds like this will fix Andrew's problem and probably lots of
> other random DP related failures.
>
> Looks like the ->detect function is similarly protected at the call
> site (though one level up in ->fill_modes), so it should be safe.
> Looks like all the call sites in the link_status function are safe too.
>
> Reviewed-by: Jesse Barnes <jbarnes@virtuousgeek.org>
>
> Let's get this one upstream asap.  Should probably be cc'd to
> stable@kernel.org as well.
>
> --
> Jesse Barnes, Intel Open Source Technology Center
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx
>
Xorg 1463/1463 [000] 8894.988115: intel_dp_dpms: (ffffffffa0093026)
ffffffffa0093027 intel_dp_dpms (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/i915/i915.ko)
ffffffffa002d6e8 drm_mode_connector_property_set_ioctl (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/drm.ko)
ffffffffa002085f drm_ioctl (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/drm.ko)
ffffffff811049a5 do_vfs_ioctl ([kernel.kallsyms])
ffffffff81104a3c sys_ioctl ([kernel.kallsyms])
ffffffff814376bb system_call ([kernel.kallsyms])
30260d8957 __GI_ioctl (/lib64/libc-2.14.so)
Xorg 1463/1463 [000] 8895.005199: intel_dp_dpms_return: (ffffffffa0093026 <- ffffffffa006321b)
ffffffff81433108 kretprobe_trampoline_holder ([kernel.kallsyms])
ffffffffa002d6e8 drm_mode_connector_property_set_ioctl (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/drm.ko)
ffffffffa002085f drm_ioctl (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/drm.ko)
ffffffff811049a5 do_vfs_ioctl ([kernel.kallsyms])
ffffffff81104a3c sys_ioctl ([kernel.kallsyms])
ffffffff814376bb system_call ([kernel.kallsyms])
30260d8957 __GI_ioctl (/lib64/libc-2.14.so)
Xorg 1463/1463 [000] 8905.765634: intel_dp_dpms: (ffffffffa0093026)
ffffffffa0093027 intel_dp_dpms (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/i915/i915.ko)
ffffffffa002d6e8 drm_mode_connector_property_set_ioctl (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/drm.ko)
ffffffffa002085f drm_ioctl (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/drm.ko)
ffffffff811049a5 do_vfs_ioctl ([kernel.kallsyms])
ffffffff81104a3c sys_ioctl ([kernel.kallsyms])
ffffffff814376bb system_call ([kernel.kallsyms])
30260d8957 __GI_ioctl (/lib64/libc-2.14.so)
Xorg 1463/1463 [000] 8905.765650: intel_dp_start_link_train: (ffffffffa009225f)
ffffffffa0092260 intel_dp_start_link_train (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/i915/i915.ko)
ffffffff81433108 kretprobe_trampoline_holder ([kernel.kallsyms])
ffffffffa002d6e8 drm_mode_connector_property_set_ioctl (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/drm.ko)
ffffffffa002085f drm_ioctl (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/drm.ko)
ffffffff811049a5 do_vfs_ioctl ([kernel.kallsyms])
ffffffff81104a3c sys_ioctl ([kernel.kallsyms])
ffffffff814376bb system_call ([kernel.kallsyms])
30260d8957 __GI_ioctl (/lib64/libc-2.14.so)
Xorg 1463/1463 [000] 8905.817808: intel_dp_complete_link_train: (ffffffffa0092919)
ffffffffa009291a intel_dp_complete_link_train (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/i915/i915.ko)
ffffffff81433108 kretprobe_trampoline_holder ([kernel.kallsyms])
ffffffffa002d6e8 drm_mode_connector_property_set_ioctl (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/drm.ko)
ffffffffa002085f drm_ioctl (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/drm.ko)
ffffffff811049a5 do_vfs_ioctl ([kernel.kallsyms])
ffffffff81104a3c sys_ioctl ([kernel.kallsyms])
ffffffff814376bb system_call ([kernel.kallsyms])
30260d8957 __GI_ioctl (/lib64/libc-2.14.so)
Xorg 1463/1463 [000] 8905.819069: intel_dp_dpms_return: (ffffffffa0093026 <- ffffffffa00631f5)
ffffffff81433108 kretprobe_trampoline_holder ([kernel.kallsyms])
ffffffffa002d6e8 drm_mode_connector_property_set_ioctl (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/drm.ko)
ffffffffa002085f drm_ioctl (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/drm.ko)
ffffffff811049a5 do_vfs_ioctl ([kernel.kallsyms])
ffffffff81104a3c sys_ioctl ([kernel.kallsyms])
ffffffff814376bb system_call ([kernel.kallsyms])
30260d8957 __GI_ioctl (/lib64/libc-2.14.so)
Xorg 1463/1463 [000] 8920.030535: intel_dp_dpms: (ffffffffa0093026)
ffffffffa0093027 intel_dp_dpms (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/i915/i915.ko)
ffffffffa002d6e8 drm_mode_connector_property_set_ioctl (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/drm.ko)
ffffffffa002085f drm_ioctl (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/drm.ko)
ffffffff811049a5 do_vfs_ioctl ([kernel.kallsyms])
ffffffff81104a3c sys_ioctl ([kernel.kallsyms])
ffffffff814376bb system_call ([kernel.kallsyms])
30260d8957 __GI_ioctl (/lib64/libc-2.14.so)
Xorg 1463/1463 [000] 8920.048507: intel_dp_dpms_return: (ffffffffa0093026 <- ffffffffa006321b)
ffffffff81433108 kretprobe_trampoline_holder ([kernel.kallsyms])
ffffffffa002d6e8 drm_mode_connector_property_set_ioctl (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/drm.ko)
ffffffffa002085f drm_ioctl (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/drm.ko)
ffffffff811049a5 do_vfs_ioctl ([kernel.kallsyms])
ffffffff81104a3c sys_ioctl ([kernel.kallsyms])
ffffffff814376bb system_call ([kernel.kallsyms])
30260d8957 __GI_ioctl (/lib64/libc-2.14.so)
kworker/u:5 82/82 [000] 8921.555293: intel_dp_hot_plug: (ffffffffa0092b5d)
ffffffffa0092b5e intel_dp_hot_plug (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/i915/i915.ko)
ffffffff8105c783 process_one_work ([kernel.kallsyms])
ffffffff8105d2f4 worker_thread ([kernel.kallsyms])
ffffffff81060722 kthread ([kernel.kallsyms])
ffffffff81438414 kernel_thread_helper ([kernel.kallsyms])
kworker/u:5 82/82 [000] 8921.555297: intel_dp_check_link_status: (ffffffffa0092b6b)
ffffffffa0092b6c intel_dp_hot_plug (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/i915/i915.ko)
ffffffff81433108 kretprobe_trampoline_holder ([kernel.kallsyms])
ffffffff8105c783 process_one_work ([kernel.kallsyms])
ffffffff8105d2f4 worker_thread ([kernel.kallsyms])
ffffffff81060722 kthread ([kernel.kallsyms])
ffffffff81438414 kernel_thread_helper ([kernel.kallsyms])
kworker/u:5 82/82 [000] 8921.555298: intel_dp_hot_plug_return: (ffffffffa0092b5d <- ffffffffa006eb6c)
ffffffff81433108 kretprobe_trampoline_holder ([kernel.kallsyms])
ffffffff8105c783 process_one_work ([kernel.kallsyms])
ffffffff8105d2f4 worker_thread ([kernel.kallsyms])
ffffffff81060722 kthread ([kernel.kallsyms])
ffffffff81438414 kernel_thread_helper ([kernel.kallsyms])
kworker/u:5 82/82 [000] 8921.555300: intel_dp_hot_plug: (ffffffffa0092b5d)
ffffffffa0092b5e intel_dp_hot_plug (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/i915/i915.ko)
ffffffff8105c783 process_one_work ([kernel.kallsyms])
ffffffff8105d2f4 worker_thread ([kernel.kallsyms])
ffffffff81060722 kthread ([kernel.kallsyms])
ffffffff81438414 kernel_thread_helper ([kernel.kallsyms])
kworker/u:5 82/82 [000] 8921.555301: intel_dp_check_link_status: (ffffffffa0092b6b)
ffffffffa0092b6c intel_dp_hot_plug (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/i915/i915.ko)
ffffffff81433108 kretprobe_trampoline_holder ([kernel.kallsyms])
ffffffff8105c783 process_one_work ([kernel.kallsyms])
ffffffff8105d2f4 worker_thread ([kernel.kallsyms])
ffffffff81060722 kthread ([kernel.kallsyms])
ffffffff81438414 kernel_thread_helper ([kernel.kallsyms])
kworker/u:5 82/82 [000] 8921.555734: intel_dp_start_link_train: (ffffffffa009225f)
ffffffffa0092260 intel_dp_start_link_train (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/i915/i915.ko)
ffffffff81433108 kretprobe_trampoline_holder ([kernel.kallsyms])
ffffffff8105c783 process_one_work ([kernel.kallsyms])
ffffffff8105d2f4 worker_thread ([kernel.kallsyms])
ffffffff81060722 kthread ([kernel.kallsyms])
ffffffff81438414 kernel_thread_helper ([kernel.kallsyms])
kworker/u:5 82/82 [000] 8921.610002: intel_dp_complete_link_train: (ffffffffa0092919)
ffffffffa009291a intel_dp_complete_link_train (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/i915/i915.ko)
ffffffff81433108 kretprobe_trampoline_holder ([kernel.kallsyms])
ffffffff8105c783 process_one_work ([kernel.kallsyms])
ffffffff8105d2f4 worker_thread ([kernel.kallsyms])
ffffffff81060722 kthread ([kernel.kallsyms])
ffffffff81438414 kernel_thread_helper ([kernel.kallsyms])
kworker/u:5 82/82 [000] 8921.611037: intel_dp_start_link_train: (ffffffffa009225f)
ffffffffa0092260 intel_dp_start_link_train (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/i915/i915.ko)
ffffffffa0092c6a intel_dp_hot_plug (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/i915/i915.ko)
ffffffff81433108 kretprobe_trampoline_holder ([kernel.kallsyms])
ffffffff8105c783 process_one_work ([kernel.kallsyms])
ffffffff8105d2f4 worker_thread ([kernel.kallsyms])
ffffffff81060722 kthread ([kernel.kallsyms])
ffffffff81438414 kernel_thread_helper ([kernel.kallsyms])
kworker/u:5 82/82 [000] 8921.666002: intel_dp_start_link_train: (ffffffffa009225f)
ffffffffa0092260 intel_dp_start_link_train (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/i915/i915.ko)
ffffffffa0092c6a intel_dp_hot_plug (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/i915/i915.ko)
ffffffff81433108 kretprobe_trampoline_holder ([kernel.kallsyms])
ffffffff8105c783 process_one_work ([kernel.kallsyms])
ffffffff8105d2f4 worker_thread ([kernel.kallsyms])
ffffffff81060722 kthread ([kernel.kallsyms])
ffffffff81438414 kernel_thread_helper ([kernel.kallsyms])
kworker/u:5 82/82 [000] 8921.720970: intel_dp_start_link_train: (ffffffffa009225f)
ffffffffa0092260 intel_dp_start_link_train (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/i915/i915.ko)
ffffffffa0092c6a intel_dp_hot_plug (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/i915/i915.ko)
ffffffff81433108 kretprobe_trampoline_holder ([kernel.kallsyms])
ffffffff8105c783 process_one_work ([kernel.kallsyms])
ffffffff8105d2f4 worker_thread ([kernel.kallsyms])
ffffffff81060722 kthread ([kernel.kallsyms])
ffffffff81438414 kernel_thread_helper ([kernel.kallsyms])
kworker/u:5 82/82 [000] 8921.775934: intel_dp_start_link_train: (ffffffffa009225f)
ffffffffa0092260 intel_dp_start_link_train (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/i915/i915.ko)
ffffffffa0092c6a intel_dp_hot_plug (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/i915/i915.ko)
ffffffff81433108 kretprobe_trampoline_holder ([kernel.kallsyms])
ffffffff8105c783 process_one_work ([kernel.kallsyms])
ffffffff8105d2f4 worker_thread ([kernel.kallsyms])
ffffffff81060722 kthread ([kernel.kallsyms])
ffffffff81438414 kernel_thread_helper ([kernel.kallsyms])
kworker/u:5 82/82 [000] 8921.830905: intel_dp_start_link_train: (ffffffffa009225f)
ffffffffa0092260 intel_dp_start_link_train (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/i915/i915.ko)
ffffffffa0092c6a intel_dp_hot_plug (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/i915/i915.ko)
ffffffff81433108 kretprobe_trampoline_holder ([kernel.kallsyms])
ffffffff8105c783 process_one_work ([kernel.kallsyms])
ffffffff8105d2f4 worker_thread ([kernel.kallsyms])
ffffffff81060722 kthread ([kernel.kallsyms])
ffffffff81438414 kernel_thread_helper ([kernel.kallsyms])
kworker/u:5 82/82 [000] 8921.885873: intel_dp_start_link_train: (ffffffffa009225f)
ffffffffa0092260 intel_dp_start_link_train (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/i915/i915.ko)
ffffffffa0092c6a intel_dp_hot_plug (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/i915/i915.ko)
ffffffff81433108 kretprobe_trampoline_holder ([kernel.kallsyms])
ffffffff8105c783 process_one_work ([kernel.kallsyms])
ffffffff8105d2f4 worker_thread ([kernel.kallsyms])
ffffffff81060722 kthread ([kernel.kallsyms])
ffffffff81438414 kernel_thread_helper ([kernel.kallsyms])
kworker/u:5 82/82 [000] 8921.957591: intel_dp_hot_plug_return: (ffffffffa0092b5d <- ffffffffa006eb6c)
ffffffff81433108 kretprobe_trampoline_holder ([kernel.kallsyms])
ffffffff8105c783 process_one_work ([kernel.kallsyms])
ffffffff8105d2f4 worker_thread ([kernel.kallsyms])
ffffffff81060722 kthread ([kernel.kallsyms])
ffffffff81438414 kernel_thread_helper ([kernel.kallsyms])
kworker/u:5 82/82 [000] 8921.957594: intel_dp_hot_plug: (ffffffffa0092b5d)
ffffffffa0092b5e intel_dp_hot_plug (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/i915/i915.ko)
ffffffff8105c783 process_one_work ([kernel.kallsyms])
ffffffff8105d2f4 worker_thread ([kernel.kallsyms])
ffffffff81060722 kthread ([kernel.kallsyms])
ffffffff81438414 kernel_thread_helper ([kernel.kallsyms])
kworker/u:5 82/82 [000] 8921.957596: intel_dp_check_link_status: (ffffffffa0092b6b)
ffffffffa0092b6c intel_dp_hot_plug (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/i915/i915.ko)
ffffffff81433108 kretprobe_trampoline_holder ([kernel.kallsyms])
ffffffff8105c783 process_one_work ([kernel.kallsyms])
ffffffff8105d2f4 worker_thread ([kernel.kallsyms])
ffffffff81060722 kthread ([kernel.kallsyms])
ffffffff81438414 kernel_thread_helper ([kernel.kallsyms])
kworker/u:5 82/82 [000] 8921.957597: intel_dp_hot_plug_return: (ffffffffa0092b5d <- ffffffffa006eb6c)
ffffffff81433108 kretprobe_trampoline_holder ([kernel.kallsyms])
ffffffff8105c783 process_one_work ([kernel.kallsyms])
ffffffff8105d2f4 worker_thread ([kernel.kallsyms])
ffffffff81060722 kthread ([kernel.kallsyms])
ffffffff81438414 kernel_thread_helper ([kernel.kallsyms])
kthreadd 8526/8526 [000] 8921.970066: ironlake_dp_detect: (ffffffffa0092443)
ffffffffa0092444 intel_dp_detect (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/i915/i915.ko)
ffffffffa0063313 output_poll_execute (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/drm_kms_helper.ko)
ffffffff8105c783 process_one_work ([kernel.kallsyms])
ffffffff8105d2f4 worker_thread ([kernel.kallsyms])
ffffffff81060722 kthread ([kernel.kallsyms])
ffffffff81438414 kernel_thread_helper ([kernel.kallsyms])
kthreadd 8526/8526 [000] 8922.001120: ironlake_dp_detect: (ffffffffa0092443)
ffffffffa0092444 intel_dp_detect (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/i915/i915.ko)
ffffffffa0063313 output_poll_execute (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/drm_kms_helper.ko)
ffffffff8105c783 process_one_work ([kernel.kallsyms])
ffffffff8105d2f4 worker_thread ([kernel.kallsyms])
ffffffff81060722 kthread ([kernel.kallsyms])
ffffffff81438414 kernel_thread_helper ([kernel.kallsyms])
kthreadd 8526/8526 [000] 8922.057433: ironlake_dp_detect: (ffffffffa0092443)
ffffffffa0092444 intel_dp_detect (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/i915/i915.ko)
ffffffffa0063313 output_poll_execute (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/drm_kms_helper.ko)
ffffffff8105c783 process_one_work ([kernel.kallsyms])
ffffffff8105d2f4 worker_thread ([kernel.kallsyms])
ffffffff81060722 kthread ([kernel.kallsyms])
ffffffff81438414 kernel_thread_helper ([kernel.kallsyms])
Xorg 1463/1463 [006] 8924.761468: intel_dp_dpms: (ffffffffa0093026)
ffffffffa0093027 intel_dp_dpms (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/i915/i915.ko)
ffffffffa002d6e8 drm_mode_connector_property_set_ioctl (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/drm.ko)
ffffffffa002085f drm_ioctl (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/drm.ko)
ffffffff811049a5 do_vfs_ioctl ([kernel.kallsyms])
ffffffff81104a3c sys_ioctl ([kernel.kallsyms])
ffffffff814376bb system_call ([kernel.kallsyms])
30260d8957 __GI_ioctl (/lib64/libc-2.14.so)
Xorg 1463/1463 [006] 8924.761480: intel_dp_dpms_return: (ffffffffa0093026 <- ffffffffa00631f5)
ffffffff81433108 kretprobe_trampoline_holder ([kernel.kallsyms])
ffffffffa002d6e8 drm_mode_connector_property_set_ioctl (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/drm.ko)
ffffffffa002085f drm_ioctl (/lib/modules/3.0.0-rc6-bpp+/kernel/drivers/gpu/drm/drm.ko)
ffffffff811049a5 do_vfs_ioctl ([kernel.kallsyms])
ffffffff81104a3c sys_ioctl ([kernel.kallsyms])
ffffffff814376bb system_call ([kernel.kallsyms])
30260d8957 __GI_ioctl (/lib64/libc-2.14.so)
[ 8894.988133] [drm:intel_dp_link_down],
[ 8895.005211] [drm:ironlake_crtc_dpms], crtc 0/0 dpms off
[ 8895.057169] [drm:intel_wait_for_vblank], vblank wait timed out
[ 8895.091566] [drm:sandybridge_update_wm], FIFO watermarks For pipe A - plane 13, cursor: 6
[ 8895.091572] [drm:ironlake_check_srwm], watermark 1: display plane 25, fbc lines 3, cursor 6
[ 8895.091577] [drm:ironlake_check_srwm], watermark 2: display plane 33, fbc lines 3, cursor 6
[ 8895.091581] [drm:ironlake_check_srwm], watermark 3: display plane 169, fbc lines 4, cursor 10
[ 8895.091586] [drm:intel_update_fbc],
[ 8905.658955] [drm:ironlake_crtc_dpms], crtc 0/0 dpms on
[ 8905.658962] [drm:sandybridge_update_wm], FIFO watermarks For pipe A - plane 13, cursor: 6
[ 8905.658967] [drm:ironlake_check_srwm], watermark 1: display plane 25, fbc lines 3, cursor 6
[ 8905.658971] [drm:ironlake_check_srwm], watermark 2: display plane 33, fbc lines 3, cursor 6
[ 8905.658975] [drm:ironlake_check_srwm], watermark 3: display plane 169, fbc lines 4, cursor 10
[ 8905.710915] [drm:intel_wait_for_vblank], vblank wait timed out
[ 8905.762883] [drm:intel_wait_for_vblank], vblank wait timed out
[ 8905.763697] [drm:gen6_fdi_link_train], FDI_RX_IIR 0x100
[ 8905.763701] [drm:gen6_fdi_link_train], FDI train 1 done.
[ 8905.764360] [drm:gen6_fdi_link_train], FDI_RX_IIR 0x600
[ 8905.764364] [drm:gen6_fdi_link_train], FDI train 2 done.
[ 8905.764366] [drm:gen6_fdi_link_train], FDI train done.
[ 8905.765627] [drm:intel_update_fbc],
[ 8905.816858] [drm:intel_wait_for_vblank], vblank wait timed out
[ 8905.818850] [drm:intel_dp_complete_link_train], Training worked. DPCD=110A8401
[ 8920.030552] [drm:intel_dp_link_down],
[ 8920.048519] [drm:ironlake_crtc_dpms], crtc 0/0 dpms off
[ 8920.100481] [drm:intel_wait_for_vblank], vblank wait timed out
[ 8920.122880] [drm:sandybridge_update_wm], FIFO watermarks For pipe A - plane 13, cursor: 6
[ 8920.122887] [drm:ironlake_check_srwm], watermark 1: display plane 25, fbc lines 3, cursor 6
[ 8920.122892] [drm:ironlake_check_srwm], watermark 2: display plane 33, fbc lines 3, cursor 6
[ 8920.122896] [drm:ironlake_check_srwm], watermark 3: display plane 169, fbc lines 4, cursor 10
[ 8920.122900] [drm:intel_update_fbc],
[ 8921.555286] [drm:i915_hotplug_work_func], running encoder hotplug functions
[ 8921.555514] [drm:intel_dp_check_link_status], DPCD was 110A8401
[ 8921.555730] [drm:intel_dp_check_link_status], DPCD is now 110A8401
[ 8921.607586] [drm:intel_wait_for_vblank], vblank wait timed out
[ 8921.662555] [drm:intel_wait_for_vblank], vblank wait timed out
[ 8921.717522] [drm:intel_wait_for_vblank], vblank wait timed out
[ 8921.772487] [drm:intel_wait_for_vblank], vblank wait timed out
[ 8921.827456] [drm:intel_wait_for_vblank], vblank wait timed out
[ 8921.882426] [drm:intel_wait_for_vblank], vblank wait timed out
[ 8921.937393] [drm:intel_wait_for_vblank], vblank wait timed out
[ 8921.939808] [drm:intel_dp_complete_link_train] *ERROR* failed to train DP, aborting
[ 8921.939813] [drm:intel_dp_complete_link_train], DPCD is 110A8401
[ 8921.939818] [drm:intel_dp_link_down],
[ 8921.957373] [drm:intel_dp_complete_link_train], Training worked. DPCD=110A8401
[ 8921.957605] [drm:intel_ironlake_crt_detect_hotplug], ironlake hotplug adpa=0xf40000, result 0
[ 8921.957609] [drm:intel_crt_detect], CRT not detected via hotplug
[ 8921.957613] [drm:output_poll_execute], [CONNECTOR:5:VGA-1] status updated from 2 to 2
[ 8921.970060] [drm:output_poll_execute], [CONNECTOR:8:HDMI-A-1] status updated from 2 to 2
[ 8921.970072] [drm:ironlake_dp_detect], DPCD was 00000000
[ 8921.970588] [drm:intel_dp_aux_ch], dp_aux_ch timeout status 0x5143003e
[ 8921.970592] [drm:ironlake_dp_detect], Try 0: ret=-110 DPCD=00000000
[ 8921.972865] [drm:intel_dp_aux_ch], dp_aux_ch timeout status 0x5143003e
[ 8921.972866] [drm:ironlake_dp_detect], Try 1: ret=-110 DPCD=00000000
[ 8921.974867] [drm:intel_dp_aux_ch], dp_aux_ch timeout status 0x5143003e
[ 8921.974869] [drm:ironlake_dp_detect], Try 2: ret=-110 DPCD=00000000
[ 8921.976354] [drm:ironlake_dp_detect], No link. DPCD: 00000000
[ 8921.976360] [drm:output_poll_execute], [CONNECTOR:11:DP-1] status updated from 2 to 2
[ 8921.988736] [drm:output_poll_execute], [CONNECTOR:14:HDMI-A-2] status updated from 2 to 2
[ 8922.001117] [drm:output_poll_execute], [CONNECTOR:16:HDMI-A-3] status updated from 2 to 2
[ 8922.001123] [drm:ironlake_dp_detect], DPCD was 110A8401
[ 8922.001337] [drm:ironlake_dp_detect], Try 0: ret=4 DPCD=110A8401
[ 8922.001339] [drm:ironlake_dp_detect], Happy now!
[ 8922.001341] [drm:ironlake_dp_detect], No link. DPCD: 110a8401
[ 8922.002389] [drm:i2c_algo_dp_aux_xfer], dp_aux_xfer return 2
[ 8922.029953] [drm:i2c_algo_dp_aux_xfer], dp_aux_xfer return 2
[ 8922.057428] [drm:i2c_algo_dp_aux_xfer], dp_aux_xfer return 2
[ 8922.057429] [drm:drm_detect_monitor_audio], Monitor has basic audio support
[ 8922.057431] [drm:output_poll_execute], [CONNECTOR:17:DP-2] status updated from 1 to 1
[ 8922.057435] [drm:ironlake_dp_detect], DPCD was 00000000
[ 8922.057948] [drm:intel_dp_aux_ch], dp_aux_ch timeout status 0x5143003e
[ 8922.057949] [drm:ironlake_dp_detect], Try 0: ret=-110 DPCD=00000000
[ 8922.059815] [drm:intel_dp_aux_ch], dp_aux_ch timeout status 0x5143003e
[ 8922.059818] [drm:ironlake_dp_detect], Try 1: ret=-110 DPCD=00000000
[ 8922.061817] [drm:intel_dp_aux_ch], dp_aux_ch timeout status 0x5143003e
[ 8922.061823] [drm:ironlake_dp_detect], Try 2: ret=-110 DPCD=00000000
[ 8922.063303] [drm:ironlake_dp_detect], No link. DPCD: 00000000
[ 8922.063309] [drm:output_poll_execute], [CONNECTOR:19:DP-3] status updated from 2 to 2
[ 8924.655081] [drm:ironlake_crtc_dpms], crtc 0/0 dpms on
[ 8924.655087] [drm:sandybridge_update_wm], FIFO watermarks For pipe A - plane 13, cursor: 6
[ 8924.655091] [drm:ironlake_check_srwm], watermark 1: display plane 25, fbc lines 3, cursor 6
[ 8924.655096] [drm:ironlake_check_srwm], watermark 2: display plane 33, fbc lines 3, cursor 6
[ 8924.655100] [drm:ironlake_check_srwm], watermark 3: display plane 169, fbc lines 4, cursor 10
[ 8924.706753] [drm:intel_wait_for_vblank], vblank wait timed out
[ 8924.758721] [drm:intel_wait_for_vblank], vblank wait timed out
[ 8924.759533] [drm:gen6_fdi_link_train], FDI_RX_IIR 0x100
[ 8924.759537] [drm:gen6_fdi_link_train], FDI train 1 done.
[ 8924.760196] [drm:gen6_fdi_link_train], FDI_RX_IIR 0x600
[ 8924.760200] [drm:gen6_fdi_link_train], FDI train 2 done.
[ 8924.760202] [drm:gen6_fdi_link_train], FDI train done.
[ 8924.761462] [drm:intel_update_fbc],
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  Last update: 2011-07-25 19:43    [from the cache]
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