1 files changed, 6 insertions, 1 deletions

diff --git a/arch/i386/boot/video.c b/arch/i386/boot/video.c
index 027a2c90300b..958130ef0042 100644
--- a/arch/i386/boot/video.c
+++ b/arch/i386/boot/video.c
@@ -195,7 +195,7 @@ static void vga_recalc_vertical(void)
 {
         unsigned int font_size, rows;
         u16 crtc;
-        u8 ov;
+        u8 pt, ov;
 
         set_fs(0);
         font_size = rdfs8(0x485); /* BIOS: font size (pixels) */
@@ -206,7 +206,12 @@ static void vga_recalc_vertical(void)
 
         crtc = vga_crtc();
 
+        pt = in_idx(crtc, 0x11);
+        pt &= ~0x80;            /* Unlock CR0-7 */
+        out_idx(pt, crtc, 0x11);
+
         out_idx((u8)rows, crtc, 0x12); /* Lower height register */
+
         ov = in_idx(crtc, 0x07); /* Overflow register */
         ov &= 0xbd;
         ov |= (rows >> (8-1)) & 0x02;