From the Mepis.org site. They have seen ATI problems too. I don't
remember seeing from you that you definitely had an ATI or a Intel i810, but here you go. Was a Mepis and a Debian problem with an official ATI driver.
<block quote> 5. ATI card may not be allowing users to power off their machines or switch users properly. This seems to only be a problem after installing the official ATI driver. This has not been found to be a problem with the free xorg driver. We have included a new version of te driver in this release and we dont know what is causing the issue. It could be anything from the new driver having a bug or how MEPIS has compiled the kernel module and included everything.
*UPDATE* The version of the ATI fglrx driver that we were using had this symptom as a known issue. After finding this we found that Norbert Tretkowski of Debian has patched the ATI driver to fix this problem. We have tested this in house and it appears to have successfully fixed the problem. Thanks to Norbert for getting this to work.