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Boot fails after stretch upgrade to linux 4.9.0



Hi,

With a recent Stretch update, linux 4.9.0-1-amd64 was installed. I got:
  A TPM error (6) occurred attempting to read a pcr value

Disabling the security chip from BIOS solved the error. Still, 4.9.0
does not boot. It manages to start some service (e.g., network
manager), but then it gets stuck before displaying the login screen.

I managed to boot in recovery mode. I collect here some grep of errors
and warnings:

- From dmesg:
  [ 0.773426] acpi PNP0A08:00: _OSC failed (AE_SUPPORT); disabling ASPM

- From journalctl -xb:
  Jan 28 10:05:08 debian-francesco kernel: acpi PNP0A08:00: _OSC failed (AE_SUPPORT); disabling ASPM
  -- The process /bin/plymouth could not be executed and failed.
  Jan 28 10:05:17 debian-francesco bluetoothd[512]: Sap driver initialization failed.
  Jan 28 10:05:08 debian-francesco kernel: EXT4-fs (sda3): re-mounted. Opts: errors=remount-ro
  -- The error number returned by this process is 2.

- From syslog:
  https://is.gd/fMGaPr

When rebooting from recovery mode (i.e., executing 'systemctl
reboot'), it also gets stuck.

Finally, If I pass the following command in recovery mode
  # lspci -nn | grep VGA
it gets stuck (ctrl-c/d/z have no effect) right after displaying this
message:
    [   19.948099] nouveau 0000:01:00.0: DRM: suspending console...
    [   19.951782] nouveau 0000:01:00.0: DRM: suspending display...
    [   19.955032] nouveau 0000:01:00.0: DRM: evicting buffers...
    [   19.958215] nouveau 0000:01:00.0: DRM: waiting for kernel channels to go idle...
    [   19.961380] nouveau 0000:01:00.0: DRM: suspending client object trees...
    [   19.964738] nouveau 0000:01:00.0: DRM: suspending kernel object tree...

I successfully booted with the old 4.8.0 kernel (normal mode). In that
case:
  $ lspci -nn | grep VGA
  00:02.0 VGA compatible controller [0300]: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0126] (rev 09)
  01:00.0 VGA compatible controller [0300]: NVIDIA Corporation GF119M [Quadro NVS 4200M] [10de:1057] (rev a1)


Not sure if it is related to some configuration I may have modified in
the past, to graphics drivers or, e.g., to old BIOS? Maybe something
else?

I have a Thinkpad T420.

Thanks,
Francesco


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