udev-monitor-hotplug
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codingtony
Added changes that I might be useful for a device with DisplayPort
Added changes that I might be useful for a device with DisplayPort Also on my environment the udev directive ENV{HOTPLUG} wasn't available on my environment so I thought it might be useful to let others know about it
Added changes that I might be useful for a device with DisplayPort Also on my environment the udev directive ENV{HOTPLUG} wasn't available on my environment so I thought it might be useful to let others know about it
And did everything work even without the ENV{HOTPLUG} directive?
What I meant was that
Added changes that I might be useful for a device with DisplayPort Also on my environment the udev directive ENV{HOTPLUG} wasn't available on my environment so I thought it might be useful to let others know about it
And did everything work even without the ENV{HOTPLUG} directive?
No, it didn't work.
What I meant was that on my environment was no ENV{HOTPLUG} directive. And I had to find a solution for this.
I found one and i posted this solution here as a PR for review
But which rule worked in your system?
The first time I read I didn't notice the stackexchange link, I thought the PR was just about DisplayPort.
Oh, i guess i ommited the "rules file" that i am using. I excluded that directive completely. And here is my trouble shoot path:
My system
root@HP-ProBook-470-G5:/etc/udev/rules.d# cat /etc/lsb-release
DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=20.10
DISTRIB_CODENAME=groovy
DISTRIB_DESCRIPTION="Ubuntu 20.10"
I tried to monitor the events with udevd, but failed.
root@HP-ProBook-470-G5:/etc/udev/rules.d# udevd
udevd: command not found
so I used the udevadm monitor to verify the event
root@HP-ProBook-470-G5:/etc/udev/rules.d# udevadm monitor
monitor will print the received events for:
UDEV - the event which udev sends out after rule processing
KERNEL - the kernel uevent
KERNEL[42303.933768] change /devices/pci0000:00/0000:00:02.0/drm/card0 (drm)
UDEV [42304.066600] change /devices/pci0000:00/0000:00:02.0/drm/card0 (drm)
KERNEL[42304.364653] add /devices/pci0000:00/0000:00:14.0/usb1/1-2 (usb)
KERNEL[42304.365857] add /devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2:1.0 (usb)
KERNEL[42304.369941] bind /devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2:1.0 (usb)
KERNEL[42304.370093] bind /devices/pci0000:00/0000:00:14.0/usb1/1-2 (usb)
UDEV [42304.554444] add /devices/pci0000:00/0000:00:14.0/usb1/1-2 (usb)
UDEV [42304.646693] add /devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2:1.0 (usb)
UDEV [42304.726060] bind /devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2:1.0 (usb)
UDEV [42304.813698] bind /devices/pci0000:00/0000:00:14.0/usb1/1-2 (usb)
KERNEL[42305.382477] add /devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2.3 (usb)
KERNEL[42305.387848] add /devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2.3/1-2.3:1.0 (usb)
KERNEL[42305.388163] bind /devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2.3 (usb)
KERNEL[42305.726932] add /devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2.4 (usb)
KERNEL[42305.727885] add /devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2.4/1-2.4:1.0 (usb)
KERNEL[42305.732438] bind /devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2.4/1-2.4:1.0 (usb)
KERNEL[42305.732565] bind /devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2.4 (usb)
UDEV [42305.842233] add /devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2.4 (usb)
UDEV [42305.859561] add /devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2.3 (usb)
UDEV [42305.960310] add /devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2.4/1-2.4:1.0 (usb)
UDEV [42306.044268] add /devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2.3/1-2.3:1.0 (usb)
UDEV [42306.184810] bind /devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2.4/1-2.4:1.0 (usb)
UDEV [42306.213116] bind /devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2.3 (usb)
UDEV [42306.275536] bind /devices/pci0000:00/0000:00:14.0/usb1/1-2/1-2.4 (usb)
In the end i came up with a "rules" file that don't include the ENV{HOTPLUG}=="1".
Maybe i am mising something here, but it works :)
ACTION=="change"
SUBSYSTEM=="drm"
RUN+="/home/user/monitor-hotplug.sh"
In the end i came up with a "rules" file that don't include the
ENV{HOTPLUG}=="1".
By my tests, everything worked on 20.04, maybe it's a difference between the distros.
In the next version of the script it might be worth adding the two udev rules or a way to install the correct one for each distro.
In any case, it is possible to add 2 or more rules to the same file, I think it's valid that you edit the PR and modify the rules file including the version your version.