Here is duplicate of this bug that confirms that it appears on many HP Compaq notebooks after upgrading to Ubuntu 9.04:
https://bugs.launchpad.net/ubuntu/+bug/361556
I suggest to merge the bugs.
Here is duplicate of this bug that confirms that it appears on many HP Compaq notebooks after upgrading to Ubuntu 9.04:
https:/ /bugs.launchpad .net/ubuntu/ +bug/361556
I suggest to merge the bugs.