When allocating a new VC with vgacon_init(), the font is
shared across all the VGA consoles. However, the font
mask was always set to the default value of zero in visual_init(),
even if we were using 512 character fonts at the time.
Moreover, code in vgacon.c:vga_do_font_op() didn't reset
the mask if the console driver thinks it's already in 512 character
mode. This means that to *fix* it, you'd actually have to take
the console out of 512 character mode and then set it back.
The attached sets vc_hi_font_mask in vgacon_init() for
any new consoles opened if the vgacon driver is already
in 512 character mode, solving this.
This bug goes back to 2.4.18 at least, probably earlier.
Bill
diff -ru linux-2.6.11-orig/drivers/video/console/vgacon.c linux-2.6.11/drivers/video/console/vgacon.c
--- linux-2.6.11-orig/drivers/video/console/vgacon.c 2005-04-08 23:52:59.000000000 -0400
+++ linux-2.6.11/drivers/video/console/vgacon.c 2005-04-14 14:54:29.000000000 -0400
@@ -337,6 +337,8 @@
c->vc_scan_lines = vga_scan_lines;
c->vc_font.height = vga_video_font_height;
c->vc_complement_mask = 0x7700;
+ if (vga_512_chars)
+ c->vc_hi_font_mask = 0x0800;
p = *c->vc_uni_pagedir_loc;
if (c->vc_uni_pagedir_loc == &c->vc_uni_pagedir ||
!--c->vc_uni_pagedir_loc[1])
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