I cannot confirm that bug on Kubuntu 6.10 RC on laptop with ATI Radeon IGP 200M and desktop with Radeon 9600. That might be not graphic card dependent but computer mainboard/bios. When you have this black screen, could you swith to the text console and login? (CTRL+ALT+F1) Try to switch to the text console, login, type: sudo dmesg, copy the output to file. Also you can copy the syslog file (or maybe just 30 last lines from it). Put (paste) them somewhere so we can look at them. If you can't swith to the first text console try to switch to others (CTRL+ALT+F2 to F8 (F7 it the X-server terminal) and F8 might have logs).
** Changed in: kubuntu-meta (Ubuntu) Status: Unconfirmed => Needs Info -- Problems when power off https://launchpad.net/bugs/67595 -- kubuntu-bugs mailing list kubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/kubuntu-bugs