Re: [PATCH] vgacon: Workaround for resize bug in some chipsets

[Samuel Thibault]

Hi,

The following patch should correct the issue:

When doublescan mode is in use, scanlines must be doubled.

Signed-off-by: Samuel Thibault <samuel.thibault@xxxxxxxxxxxx>

--- drivers/video/console/vgacon.c.orig	2005-11-17 00:40:02.000000000 +0100
+++ drivers/video/console/vgacon.c	2005-11-17 00:42:27.000000000 +0100
@@ -502,10 +502,16 @@
 {
 	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);
 
-
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