qemu and simics simulators both seem to expect that video should be disabled before changing the video mode.

references: http://git.qemu.org/?p=qemu.git;a=blob;f=hw/display/vga.c;h=c0f7b343bbab586c... http://wiki.osdev.org/Bochs_VBE_Extensions#Setting_display_resolution_and_bi...

Signed-off-by: Chris Ruffin chris.ruffin@intel.com Reviewed-by: Gerd Hoffmann kraxel@redhat.com --- drivers/gpu/drm/bochs/bochs_hw.c | 1 + 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/bochs/bochs_hw.c b/drivers/gpu/drm/bochs/bochs_hw.c index 4603897..a39b034 100644 --- a/drivers/gpu/drm/bochs/bochs_hw.c +++ b/drivers/gpu/drm/bochs/bochs_hw.c @@ -164,6 +164,7 @@ void bochs_hw_setmode(struct bochs_device *bochs,

bochs_vga_writeb(bochs, 0x3c0, 0x20); /* unblank */

+ bochs_dispi_write(bochs, VBE_DISPI_INDEX_ENABLE, 0); bochs_dispi_write(bochs, VBE_DISPI_INDEX_BPP, bochs->bpp); bochs_dispi_write(bochs, VBE_DISPI_INDEX_XRES, bochs->xres); bochs_dispi_write(bochs, VBE_DISPI_INDEX_YRES, bochs->yres);