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


From: Herbie Robinson
Subject: [Qemu-devel] [Bug 1670509] Re: sgabios outputs incorrect video modes
Date: Wed, 13 Dec 2017 15:53:12 -0000

I believe QEMU has handed ownership of this off to coreboot.  Which
makes sense.

https://review.coreboot.org/cgit/sgabios.git

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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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