Public bug reported:
In Bionic azure-edge proposed kernel 4.18.0-1008 we're observing an issue that
got carried from upstream.
This is the first version we checked specifically for this issue, we don't have
yet a good/bad proposed comparison set of versions.
linux-next-5.0.0-9673b4a-20012019 does not have this issue <- daily upstream
linux-next
linux-next-4.20.0-6a1d293-27122018 has the issue <- all 4.1x/4.2x series from
upstream have this problem.
This behavior can be seen only on Hyper-V, as it must use the VM console UI:
- boot the above kernels.
- try to login with username and password.
- After you input the username and press Enter in the Hyper-V console, another
Enter (newline) is automatically received by the console, making it impossible
to input the password.
Afterward, the console behaves like a series of newlines are received
and it resets after a while, presenting again the linux user login.
Repro rates:
- 100% on WS2019
- on WS2016 depending on situation it might not be visible 100%.
Problem does not exist for Azure, it's specific to Hyper-V VM console
only.
** Affects: linux-azure (Ubuntu)
Importance: Undecided
Status: New
** Tags: hyperv
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https://bugs.launchpad.net/bugs/1813026
Title:
[Hyper-V] VM console orphan newline input during login
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