https://bugzilla.kernel.org/show_bug.cgi?id=109081
--- Comment #15 from Ludovic Magerand <[email protected]> --- Hi, I tried to play with the bios options previously, and it didn't changed anything, but I couldn't remember if I did it before I flashed the bios to the newest version or not. The latest bios version enable more options about the CPU, they are : * SpeedStep (enabled by default) * Virtualization (enabled by default) * HyperThreading (enabled by default) * C-states (enabled by default) * VT-d (disable by default) So I reverted all the bios settings to default, removed FastBoot and put back BootMode to "UEFI with CSM" (I will need UEFI to boot windows as long as I don't have the linux kernel and nvidia drivers working), and configured UEFI to boot on the external hard drive if present. Then I played with the 3 options that was most likely to had something to do with this bug (SpeedStep, HyperThreading and C-states). The conclusion is that whatever SpeedStep and HyperThreading are set to, if C-states are enabled, the kernel freeze, and if they are disabled, I can boot either on 4.4-rc5 or 4.3.3-gentoo without any acpi or lapic options. If I boot with C-states disabled and both SpeedStep and HyperThreading enabled, the two later seem to work perfectly: I have the 8 virtual cores detected and working, and the conservative cpufreq policy seems to work correctly as I monitored the cpu frequency during a build of the kernel and it was stepping from 800MHz to 2600MHz with a lot of in-between values separetly on all the virtual cores. The kernel logs on 4.4-rc5 seems to be the same as previously, with the sames ACPI errors still occuring. As a conclusion, I would say the freeze are most likely caused by the C-states, and I can live without them for now, even if it would be better to have them working (this laptop battery is already quite short). If you have some patches to test, I will try them, and if you need some informations, I will provide them too. Now I have to install the nvidia-drivers (hoping that the _REG error will not make this driver failling as it is something related to the graphical devices) to see if I can switch completly to linux ^^ -- You are receiving this mail because: You are watching the assignee of the bug. ------------------------------------------------------------------------------ _______________________________________________ acpi-bugzilla mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/acpi-bugzilla
