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gpu-manager's drm output detection affects boot time
Status in ubuntu-drivers-common package in Ubuntu:
Status in ubuntu-drivers-common source package in Xenial:
The current drm code to probe the connected outputs is too resource
intensive, and slow down the boot process.
1) Boot Ubuntu and run the following command, looking for gpu-manager:
This will show how long gpu-manager took. Write down the number
2) Install the package from -proposed, and run systemd-analize blame.
See if the number has become smaller.
Low, all the changes are already included in Yakkety.
Rather than calling drm directly, gpu-manager should simply check the outputs
connector status by using the sysfs filesystem (e.g.
/sys/class/drm/card0-HDMI-A-1/status, etc.), thus relying on data that is
This should make gpu-manager a bit less resource intensive, especially
The attached perf shows the problem in gpu-manager.
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