While I do not see the commit in the 4.18.0-1008 changelog (
https://launchpad.net/ubuntu/+source/linux-azure-
edge/4.18.0-1008.8~18.04.1 ) I would plant the upstream bisect near
"Input: hyper-v - fix wakeup from suspend-to-idle" which was merged
upstream in December:

commit adac0753c25217a2365b132c87cb2540b51fa89b
Merge: 0072a0c14d5b 6c3516fed7b6
Author: Linus Torvalds <torva...@linux-foundation.org>
Date:   Tue Dec 4 08:47:04 2018 -0800

    Merge branch 'for-linus' of
git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input

    Pull input updates from Dmitry Torokhov:
     "Mostly new IDs for Elan/Synaptics touchpads, plus a few small fixups"

    * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
      Input: omap-keypad - fix keyboard debounce configuration
      Input: xpad - quirk all PDP Xbox One gamepads
      Input: synaptics - enable SMBus for HP 15-ay000
      Input: synaptics - add PNP ID for ThinkPad P50 to SMBus
      Input: elan_i2c - add ACPI ID for Lenovo IdeaPad 330-15ARR
      Input: elan_i2c - add support for ELAN0621 touchpad
      Input: hyper-v - fix wakeup from suspend-to-idle
      Input: atkbd - clean up indentation issue
      Input: st1232 - convert to SPDX identifiers
      Input: migor_ts - convert to SPDX identifiers
      Input: dt-bindings - fix a typo in file input-reset.txt
      Input: cros_ec_keyb - fix button/switch capability reports
      Input: elan_i2c - add ELAN0620 to the ACPI table
      Input: matrix_keypad - check for errors from of_get_named_gpio()

commit 10f91c73cc41ceead210a905dbd196398e99c7d2
Author: Vitaly Kuznetsov <vkuzn...@redhat.com>
Date:   Thu Nov 15 11:05:10 2018 -0800

    Input: hyper-v - fix wakeup from suspend-to-idle

    It makes little sense but still possible to put Hyper-V guests into
    suspend-to-idle state. To wake them up two wakeup sources were registered
    in the past: hyperv-keyboard and hid-hyperv. However, since
    commit eed4d47efe95 ("ACPI / sleep: Ignore spurious SCI wakeups from
    suspend-to-idle") pm_wakeup_event() from these devices is ignored. Switch
    to pm_wakeup_hard_event() API as these devices are actually the only
    possible way to wakeup Hyper-V guests.

    Fixes: eed4d47efe95 (ACPI / sleep: Ignore spurious SCI wakeups from 
suspend-to-idle)
    Reviewed-by: Rafael J. Wysocki <rafael.j.wyso...@intel.com>
    Acked-by: K. Y. Srinivasan <k...@microsoft.com>
    Acked-by: Jiri Kosina <jkos...@suse.cz>
    Signed-off-by: Vitaly Kuznetsov <vkuzn...@redhat.com>
    Signed-off-by: Dmitry Torokhov <dmitry.torok...@gmail.com>

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https://bugs.launchpad.net/bugs/1813026

Title:
  [Hyper-V] VM console orphan newline input during login

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