Just wanted to add that I have a Samsung R560 with a P8400 chipset and indeed 4 GB of memory. My last state with Ubuntu 8.10 AMD64 (released version) was as well: reboots unless I use acpi=off.
I tried mem=4096M after finding this bug. It boots, but only sees 3 GB instead of 4 GB which are installed. It does see all 4 GB when booting with acpi=off. Some more ACPI info can probably be found here: http://www.lesswatts.org/projects/acpi/ -- 64-bit Intrepid automatic permanent reboot loop related to having exactly 4GB of memory https://bugs.launchpad.net/bugs/272530 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs