[Qemu-devel] [Bug 1670509] [NEW] sgabios outputs incorrect video modes

[Herbie Robinson]

Public bug reported:

When run with a bootstrap loader that uses int 0x10 with 0x1301 in %ax,
incorrect video modes are output to the serial port.  I believe the VGA
image will be correct.  This might also affect the returned values for
some interrupts.

This is caused because the set_cursor_position routine fails to save and
restore %bx.

I'm working on a fix for this.

** Affects: qemu
     Importance: Undecided
         Status: New


** Tags: sgabios

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https://bugs.launchpad.net/bugs/1670509

Title:
  sgabios outputs incorrect video modes

Status in QEMU:
  New

Bug description:
  When run with a bootstrap loader that uses int 0x10 with 0x1301 in
  %ax, incorrect video modes are output to the serial port.  I believe
  the VGA image will be correct.  This might also affect the returned
  values for some interrupts.

  This is caused because the set_cursor_position routine fails to save
  and restore %bx.

  I'm working on a fix for this.

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