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

[Nathan Rennie-Waldock]

Fixed in qemu, yes. But not Ubuntu. Ubuntu strips prebuilt files from
qemu and builds them from source. For sgabios, using the abandoned
source from Google code.

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

Title:
  sgabios outputs incorrect video modes

Status in QEMU:
  Fix Released
Status in sgabios package in Ubuntu:
  Confirmed

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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