[Qemu-devel] [Bug 1756538] [NEW] Minimal Ubuntu vs. Debian differences

[Giles Gaffney]

Public bug reported:

I'm using Qemu on Ubuntu (minimal) and Debian (minimal) on Android
(Arch64) via Linux Deploy to run Windows guests. Here's a few issues I
encountered:

1) Qemu on (minimal) Debian 9 and Ubuntu cannot run Windows 7-10 guests
(only Windows XP and below) because there's a black screen after the
boot menu. Qemu on Debian 10, however, can run Windows 7. Incidentally,
these distros run on the host in bios compatibility mode instead of
UEFI. Ubuntu Desktop (full distro) on other hosts does not display the
black screen when running Qemu.

2) Qemu on Debian 9-10 (minimal) does not display fullscreen - but
Ubuntu minimal does display full-screen.

3) Qemu on Limbo PC Emulator and on Debian 9-10 only run windows guests
at 1 GHz using the default Qemu CPU, but Ubuntu runs windows guests at 2
GHz using the default Qemu CPU.

4) Enable KVM doesn't work, and virtualization isn't detected through
Limbo PC Emulator and minimal Linux distros running on Android - perhaps
is a problem with running Linux distros via Linux Deploy using Chroot on
Android (not so much a Qemu-KVM issue) and failing to detect ARMv8-A
CPUs that are indeed capable of virtualization.

Can anyone explain these differences? I believe they are all using the
latest versions of Qemu.

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1756538

Title:
  Minimal Ubuntu vs. Debian differences

Status in QEMU:
  New

Bug description:
  I'm using Qemu on Ubuntu (minimal) and Debian (minimal) on Android
  (Arch64) via Linux Deploy to run Windows guests. Here's a few issues I
  encountered:

  1) Qemu on (minimal) Debian 9 and Ubuntu cannot run Windows 7-10
  guests (only Windows XP and below) because there's a black screen
  after the boot menu. Qemu on Debian 10, however, can run Windows 7.
  Incidentally, these distros run on the host in bios compatibility mode
  instead of UEFI. Ubuntu Desktop (full distro) on other hosts does not
  display the black screen when running Qemu.

  2) Qemu on Debian 9-10 (minimal) does not display fullscreen - but
  Ubuntu minimal does display full-screen.

  3) Qemu on Limbo PC Emulator and on Debian 9-10 only run windows
  guests at 1 GHz using the default Qemu CPU, but Ubuntu runs windows
  guests at 2 GHz using the default Qemu CPU.

  4) Enable KVM doesn't work, and virtualization isn't detected through
  Limbo PC Emulator and minimal Linux distros running on Android -
  perhaps is a problem with running Linux distros via Linux Deploy using
  Chroot on Android (not so much a Qemu-KVM issue) and failing to detect
  ARMv8-A CPUs that are indeed capable of virtualization.

  Can anyone explain these differences? I believe they are all using the
  latest versions of Qemu.

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