[PATCH] vgacon: fix doublescan mode

When doublescan mode is in use, scanlines must be doubled. Thanks to Jason Dravet <[email protected]> for reporting and testing. Signed-off-by: Samuel Thibault <[email protected]> Cc: <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
hjking · Jan 9, 2006 · 954de91 · 954de91
1 parent b8b0af2
commit 954de91
Showing 1 changed file with 7 additions and 1 deletion.
diff --git a/drivers/video/console/vgacon.c b/drivers/video/console/vgacon.c
@@ -503,10 +503,16 @@ static int vgacon_doresize(struct vc_data *c,
 {
 	unsigned long flags;
 	unsigned int scanlines = height * c->vc_font.height;
-	u8 scanlines_lo, r7, vsync_end, mode;
+	u8 scanlines_lo, r7, vsync_end, mode, max_scan;
 
 	spin_lock_irqsave(&vga_lock, flags);
 
+	outb_p(VGA_CRTC_MAX_SCAN, vga_video_port_reg);
+	max_scan = inb_p(vga_video_port_val);
+
+	if (max_scan & 0x80)
+		scanlines <<= 1;
+
 	outb_p(VGA_CRTC_MODE, vga_video_port_reg);
 	mode = inb_p(vga_video_port_val);