The feature was added in commit cb5a7aa8c32141bb Sep 2008.
My description is based on "Better VGA retrace emulation (needed
for some DOS games/demos)" from
http://www.boblycat.org/~malc/code/patches/qemu/index.html
Signed-off-by: Matthew Ogilvie <mmogilvi_q...@miniinfo.net>
---
qemu-options.hx | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/qemu-options.hx b/qemu-options.hx
index 3c411c4..3e8085d 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -945,7 +945,7 @@ DEF("vga", HAS_ARG, QEMU_OPTION_vga,
"-vga [std|cirrus|vmware|qxl|xenfb|none]\n"
" select video card type\n", QEMU_ARCH_ALL)
STEXI
-@item -vga @var{type}
+@item -vga @var{type}[,@var{prop}=@var{value}[,...]]
@findex -vga
Select type of VGA card to emulate. Valid values for @var{type} are
@table @option
@@ -970,6 +970,12 @@ Recommended choice when using the spice protocol.
@item none
Disable VGA card.
@end table
+Valid optional properties are
+@table @option
+@item retrace=dumb|precise
+Select dumb (default) or precise VGA retrace logic, useful for some
+DOS games/demos.
+@end table
ETEXI
DEF("full-screen", 0, QEMU_OPTION_full_screen,
--
1.7.10.2.484.gcd07cc5
