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It looks like this is the Intel graphics kernel driver searching for
monitors.
sudo perf record -ag sleep 10
sudo perf report
# Events: 217 cycles
#
# Overhead Command Shared Object Symbol
# ........ .............. ........................... ..........................................
#
27.26% kworker/0:2 [i915] [k] get_clock
|
--- get_clock
|
|--99.12%-- sclhi
| |
| |--86.83%-- i2c_bit_add_numbered_bus
| | i2c_bit_add_numbered_bus
| | i2c_bit_add_numbered_bus
| | i2c_bit_add_numbered_bus
| | intel_gpio_create
| | intel_gpio_create
| | i2c_transfer
| | drm_do_probe_ddc_edid
| | drm_edid_block_valid
| | intel_hdmi_detect
| | drm_target_preferred.clone.9
| | process_one_work
| | worker_thread
| | kthread
| | kernel_thread_helper
| |
| --13.17%-- i2c_stop
| i2c_bit_add_numbered_bus
| |
| |--83.32%-- i2c_bit_add_numbered_bus
| | i2c_bit_add_numbered_bus
| | intel_gpio_create
| | intel_gpio_create
| | i2c_transfer
| | drm_do_probe_ddc_edid
| | drm_edid_block_valid
| | intel_hdmi_detect
| | drm_target_preferred.clone.9
| | process_one_work
| | worker_thread
| | kthread
| | kernel_thread_helper
| |
| --16.68%-- intel_gpio_create
| intel_gpio_create
| i2c_transfer
| drm_do_probe_ddc_edid
| drm_edid_block_valid
| intel_hdmi_detect
| drm_target_preferred.clone.9
| process_one_work
| worker_thread
| kthread
| kernel_thread_helper
|
--0.88%-- i2c_bit_add_numbered_bus
--
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which is subscribed to xserver-xorg-video-intel in Ubuntu.
https://bugs.launchpad.net/bugs/746084
Title:
[i945gm] Stuttering mouse with Natty Narwhal
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