Xorg freezes completely after ENTER is pressed for the first time in session

[jnns]

I started the update manager manually and wanted to start a check for new updates. As expected I was prompted for the password and entered it. But as soon as I pressed enter there was no response from the desktop environment anymore at all. Even switching to the different virtual terminals didn't work.

I rebooted the computer and repeated the procedure to see if this would happen again and it did! This time I didn't reboot but connected my laptop via ssh to see what was going on. Luckily, the system is still operational; it seems that just Xorg is having a hiccup and is running at 100% cpu usage.

Killing Xorg with sudo kill -s 9 <pid> solved the issue as I am now able to complete the process just fine. Although I'm still waiting with the updates in order to give you some more information if you need me to.

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xorg: 1:7.5+1ubuntu2

top - 11:00:42 up 15 min, 2 users, load average: 0.92, 0.93, 0.62
Tasks: 167 total, 2 running, 165 sleeping, 0 stopped, 0 zombie
Cpu(s): 50.2%us, 0.2%sy, 0.0%ni, 49.7%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 4057260k total, 896824k used, 3160436k free, 54540k buffers
Swap: 1726948k total, 0k used, 1726948k free, 339584k cached
  PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
 1160 root 40 0 635m 36m 15m R 100 0.9 14:41.32 Xorg

[jnns (jnns)]

The issue occurred again after sudo'ing in gnome-terminal as well as starting an ssh session so I suspect this has rather to do with Xorg than with update-manager

[jnns (jnns)]

I've narrowed it down and this is really strange: Xorg freezes when the ENTER-key is pressed for the first time after booting up. This is not depending on the users' config as it also happens to a newly created user and even in GDM (I had auto-login activated so the first time it happend, it happend when running update-manager). But it really depends just on the ENTER-key.

[phillamg (me-phillg)]

This shouldn't be a dupe of #516421, it should be a dupe of bug #516412