From: Dirk Mueller <dmueller@novell.com>
Subject: setfont breaks first Xserver start
References: 302010
Patch-Mainline: No, <dmueller: reposted to linux-console, Oct 4, 2017>

The patch prevents setfont from accessing vga registers on the card when
the card is in graphics mode KD_GRAPHICS as we assume, that someone else (ie.
the Xserver) is in charge of the HW in which case accessing the vga registers
may (at best) have no effect (not even the desired one) or (at worst) interfer
with settings the graphics driver has made.

Signed-off-by: Hannes Reinecke <hare@suse.de>

---
 drivers/video/console/vgacon.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/video/console/vgacon.c
+++ b/drivers/video/console/vgacon.c
@@ -1259,7 +1259,7 @@ static int vgacon_font_set(struct vc_dat
 	unsigned charcount = font->charcount;
 	int rc;
 
-	if (vga_video_type < VIDEO_TYPE_EGAM)
+	if (vga_video_type < VIDEO_TYPE_EGAM || vga_is_gfx)
 		return -EINVAL;
 
 	if (font->width != VGA_FONTWIDTH ||
@@ -1277,7 +1277,7 @@ static int vgacon_font_set(struct vc_dat
 
 static int vgacon_font_get(struct vc_data *c, struct console_font *font)
 {
-	if (vga_video_type < VIDEO_TYPE_EGAM)
+	if (vga_video_type < VIDEO_TYPE_EGAM || vga_is_gfx)
 		return -EINVAL;
 
 	font->width = VGA_FONTWIDTH;