Hi Ben,
> - Does the affected system boot using the BIOS boot protocol > (including CSM) or UEFI boot protocol? > I have grub-efi-amd64 installed so I believe I am using UEFI. > - If you boot with the added kernel parameter "earlyprintk=vga" or > "earlyprintk=serial" (and without "quiet"), do any boot messages > appear before the hang/reboot? PLease send them (a photo is fine). > > After adding earlyprintk=efi,keep in the attached photo you can see error about ACPI > - If it boots with UEFI, does the kernel parameter "efi=noruntime" > work around the problem? > Yes that fixes the problem. > > - If you haven't already reported this, does the Linux 4.5-rc4 package > from experimental have the same problem? > I am using 4.5.0-rc4-amd64 from experimental at the moment as that boots without issues. Only 4.4.0 seems to be affected. > This test version is now available at > https://people.debian.org/~benh/packages/unstable/ <https://people.debian.org/%7Ebenh/packages/unstable/> > Please report back whether this does or doesn't fix the problem for > you. <https://people.debian.org/%7Ebenh/packages/unstable/> I installed 4.4.2-3~a.test and it replaced previous 4.4.x package, but system is not booting either. Let me know if you need anything. /Mateusz
