I investigated this issue again and it is more tricky than I initially thought.
The rules (see attachment) are supposed to create a symbolic link in /etc/X11/ (it worked ALWAYS perfectly in Ubuntu 12.04 on the same hardware). The problem seems to be due to a race condition (and not due to naming. I initially assumed it is due to naming because the symlink was succesfully created when I renamed the file from graphics- xorg.config.rules to graphics-xorg-config.rules and started the system. Then I deleted the symlink renamed it back to graphics-xorg.config.rules and the symlink was not created after the next boot). After much more tries it turns out that the symlink in /etc/X11/ is sometimes created after booting and sometimes not. I assume that the symlink is created (not created) when the udev event for my rule is triggered after (before) the root files system is mounted. In the meantime I hit a similar issue with another udev rule for an USB sound device. This rule's action also requires root to be mounted for its successful execution. When the USB device is cold plugged the action is sometimes executed successfully and sometimes not. When the device is hot plugged the action is always executed successfully. So the subject of the bug should be rephrased to "udev events for cold plug devices are often triggered before root fs is mounted breaking compatibility to Ubuntu 12.04" ** Attachment added: "Rules file in /etc/udev/rules.d/" https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1319047/+attachment/4201557/+files/graphics-xorg-config.rules -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to systemd in Ubuntu. https://bugs.launchpad.net/bugs/1319047 Title: udev rule file naming requirements changed breaking compatibility to Ubuntu 12.04 Status in “systemd” package in Ubuntu: Incomplete Bug description: Binary package: udev: Installed: 204-5ubuntu20 Candidate: 204-5ubuntu20 Version table: *** 204-5ubuntu20 0 500 http://de.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages 100 /var/lib/dpkg/status Source package: systemd Ubuntu release: Description: Ubuntu 14.04 LTS Release: 14.04 Expected behavior: All rule files in /etc/udev/rules.d/ having the extension '.rules' [see udev(7)] should be honored by udevd (as it has been in Ubuntu 12.04 and as it is still by "udevadm test <syspath>"). Actual behavior: If udev rule file has an additional '.' (dot) in its name (e.g. "graphics-xorg.conf.rules) it will be silently ignored by udevd. But such a file will not be ignored by "udevadm test <syspath>", which even adds to the confusion about why the rule is not working. Also the man page udev(7) does not mention any additional/new naming requirements. How to reproduce: Create or rename a rule file in /etc/udev/rules.d/ so that its name contains an additional '.' (dot) (beside the one in '.rules', e.g. 'graphics-xorg.conf.rules') and run "udevadm control --reload". From now on the udev rules in that file will be ignored silently by udevd (but not by 'udevadm test <syspath>'!). How to solve this issue: (1) Revert to the old behavior and make udevd honor rule file names as in Ubuntu 12.04 (preferred alternative) __OR__ (2) If this change has been introduced intentionally then (2a) Announce it (e.g. in a changelog and/or upgrade guide so that users/admins know about it and can rename their rule files not matching the changed needs) (2b) Change the code of "udevadm test" (and possibly other tools) to behave consistently so that users have a chance to narrow down the naming issue (2c) Add the changed naming requirement to man page udev(7), info files, tutorials... Urgency/Importance: Normal To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1319047/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
