> On Aug 10, 2017, at 3:37 AM, Michael Tokarev <m...@tls.msk.ru> wrote:
>
> 10.08.2017 06:51, Thomas Huth wrote:
> []
>
>> I guess you'll end up with QEMU 2.1 as good version and 2.2 as the first
>> "bad" version. According the qemu-doc:
>>
>> -vga type
>>
>> Select type of VGA card to emulate. Valid values for type are
>>
>> cirrus
>>
>> Cirrus Logic GD5446 Video card. All Windows versions starting
>> from Windows 95 should recognize and use this graphic card. For
>> optimal performances, use 16 bit color depth in the guest and
>> the host OS. (This card was the default before QEMU 2.2)
>>
>> std
>>
>> Standard VGA card with Bochs VBE extensions. If your guest OS
>> supports the VESA 2.0 VBE extensions (e.g. Windows XP) and if
>> you want to use high resolution modes (>= 1280x1024x16) then you
>> should use this option. (This card is the default since QEMU
>> 2.2)
>
> Both cirrus and stdvga worked in Win2k not-so-recently. Cirrus, IIRC,
> required a driver install, stdvga used "standard vga controller" which,
> in win2k, was always marked with yellow exclamation mark, just because
> the driver itself always sets that mark, "thinking" it is always wrong
> driver.
>
> So no, it's not the switch from cirrus to std, it's something else.
>
> /mjt
Here is the commit that causes Windows 2000 video problems:
commit 94ef4f337fb614f18b765a8e0e878a4c23cdedcd
Author: Gerd Hoffmann <kra...@redhat.com>
Date: Tue May 17 10:54:54 2016 +0200
vga: add sr_vbe register set
Commit "fd3c136 vga: make sure vga register setup for vbe stays intact
(CVE-2016-3712)." causes a regression. The win7 installer is unhappy
because it can't freely modify vga registers any more while in vbe mode.
