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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, 08 Mar 2017 23:43:09 -0000

I don't think my e-mailed patch got through...  I'm going to keep
trying, but in case anyone needs the patch in the interim...

** Patch added: "0001-SGABIOS-fix-wrong-video-attrs-for-int-10h-ah-13h.patch"

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  sgabios outputs incorrect video modes

Status in QEMU:
Status in sgabios package in Ubuntu:

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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