Found a fix. Installing linux-image-2.6.33-020633rc5-generic fixed the problem for me. I'm running latest Lucid, but chances are this will work on Karmic too. If you have Karmic try it anyway and see if it works.
Open http://kernel.ubuntu.com/~kernel-ppa/mainline/ and makes a nice bookmark to it. This is where you can get latest kernel versions in nice .deb packages easy to install. Select v2.6.33-rc5/ (latest at the moment, you might try a newer one if available). Download linux-image-2.6.33-020633rc5-generic_2.6.33-020633rc5_amd64.deb Type: sudo dpkg -i linux-image-2.6.33-020633rc5-generic_2.6.33-020633rc5_amd64.deb Reboot (with no ACPI= option whatsoever). All 4 logical cores are working fine, and also speedstep scales the cores in 9 steps from 1.2 to 3.33 GHZ. Graphics(2D and 3D), sound and network card all seem to work just fine. Didn't try suspend features yet, I never really used them anyway. my BIOS is 0028 and my board revision is 204 (check the label on the board with E70932-204). -- Cannot boot 9.10 with ACPI support on Intel DH55TC mb https://bugs.launchpad.net/bugs/507770 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
