I have this problem since I have this PC (2011-12-03), i.e. I always have to hibernate before I can suspend to RAM with all Ubuntu releases since 11.10. I also tried the procedure described in DebuggingKernelSuspend in the past and tried to remove various kernel modules but without success.
I have now followed the procedure described in DebuggingKernelSuspend and attached the wakeup and dmesg.txt files. After trying to resume from suspend, the LEDs and the noise from the DVD-RW are the same as with a successful resume. However, the display stays dark and I cannot connect to the system over the network (ping or SSH). The magic number in dmesg is [ 2.088671] Magic number: 2:310:476 but there is no "hash matches" line. ** Attachment added: "cat /proc/acpi/wakeup > wakeup before suspend to RAM" https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1375995/+attachment/4224381/+files/wakeup -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1375995 Title: [HP Compaq dc7800 Small Form Factor PC] suspend/resume failure To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1375995/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
