Created attachment 322362 [details] emerge --info ASPM is disabled by ACPI on boot. Specifically, dmesg shows the following lines: [ 0.340807] pci0000:00: Requesting ACPI _OSC control (0x15) [ 0.340814] pci0000:00: ACPI _OSC request failed (AE_NOT_FOUND), returned control mask: 0x15 [ 0.340818] ACPI _OSC control for PCIe not granted, disabling ASPM and lspci -vvv | grep -i ASPM shows that ASPM is disabled for each device that has ASPM capabilities. Adding pcie_aspm=force on kernel command line does not solve the problem, since the aspm will be disabled later during the boot (with the message above). I do not know if it is relevant for the problem, but in dmesg appear also the following warning about ACPI: ACPI Warning: Optional field Pm2ControlBlock has zero address or length: 0x0000000000000000/0x1 (20120320/tbfadt-579) I was unable to gather any further information about the problem by enabling the PCI debug and the ACPI debug in the kernel. I will attach some infos that may be relevant, namely the output of emerge --info, the output of dmesg, the output of lspci -vvv and the output of dmidecode.
Created attachment 322364 [details] dmesg
Created attachment 322366 [details] lspci -vvv
Created attachment 322368 [details] dmidecode
Bugs.gentoo.org is unfortunately not a viable place for supporting this issue. Please check the forums, mailing lists, or IRC for help on this issue instead. If it -is- a kernel bug, it is highly unlikely to be caused by Gentoo's kernel patches and so the best place to report this would be directly to kernel developers. Check the Linux Kernel Mailing List (LKML) as well.
