I also experienced this bug and disabling powernow fixes it. I am not sure that the bug is classified correctly, however. I found that it happened with an nvidia card both with the proprietary and free drivers and also with an ATI card with both proprietary and free drivers.
The symptom is a hard crash -- sometimes with keyboard LEDs flashing to show a kernel panic, sometimes not even that. It had been happening to me for a long time, but it used to be relatively infrequent. Lately, perhaps since upgrading to gusty, it had been much more frequent, several times a day. The system is an AMD Athlon 64 X2 3800+ with Asus A8V Deluxe AGP (Socket 939) Motherboard. It originally had a Sapphire ATI Radeon 9200 video card, but I swapped it for an XFX Geforce 6200 card in an attempt to stop the crashing. I recently put the ATI card back in to see if that helped, but the system would inevitably crash soon after booting up. The system has been stable now with the NVIDIA card and proprietary driver for about two weeks after adding an exit command to the top of /etc/init.d/powernowd (turning Cool n' Quiet off in BIOS did not help, as the modules were loaded anyway). I have another system with the same CPU and an ATI Radeon 9200 AGP video card, but a different motherboard (Gigabyte), and it has never had a crash despite powernow being active. Anyway, I hope this info helps with debugging. -- [nvidia-glx] [amd64] Frequent lock ups with white screen with black lines when using nvidia binary driver with CPU speed scaling/Cool 'n Quiet https://bugs.launchpad.net/bugs/109643 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
