The patch titled
vt: fix console ASCII glyph 1:1 mapping
has been added to the -mm tree. Its filename is
vt-fix-console-ascii-glyph-1-1-mapping.patch
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Subject: vt: fix console ASCII glyph 1:1 mapping
From: Ingo Brueckl <ib@xxxxxxxxxxxxxxx>
For the console, there is a 1:1 mapping of glyphs which cannot be found in
the current font. This seems to be meant as a kind of 'emergency
fallback' for fonts without unicode mapping which otherwise would display
nothing readable on the screen.
At the moment it affects all chars for which no substitution character is
defined. In particular this means that for all chars (>= 128) where there
is no iso88591-1/unicode character (e.g. control character area) you'll
get the very strange 1:1 mapping of the (cp437) graphics card glyphs.
I'm pretty sure that the 1:1 mapping should only affect strict ASCII code
characters, i.e. chars < 128.
The patch limits the mapping as it probably was meant anyway.
Signed-off-by: Ingo Brueckl <ib@xxxxxxxxxxxxxxx>
Cc: Alan Cox <alan@xxxxxxxxxxxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Samuel Thibault <samuel.thibault@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/char/vt.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN drivers/char/vt.c~vt-fix-console-ascii-glyph-1-1-mapping drivers/char/vt.c
--- a/drivers/char/vt.c~vt-fix-console-ascii-glyph-1-1-mapping
+++ a/drivers/char/vt.c
@@ -2272,7 +2272,7 @@ rescan_last_byte:
continue; /* nothing to display */
}
/* Glyph not found */
- if ((!(vc->vc_utf && !vc->vc_disp_ctrl) || c < 128) && !(c & ~charmask)) {
+ if ((!(vc->vc_utf && !vc->vc_disp_ctrl) && c < 128) && !(c & ~charmask)) {
/* In legacy mode use the glyph we get by a 1:1 mapping.
This would make absolutely no sense with Unicode in mind,
but do this for ASCII characters since a font may lack
_
Patches currently in -mm which might be from ib@xxxxxxxxxxxxxxx are
unicode-fix-cp437-table.patch
vt-fix-console-ascii-glyph-1-1-mapping.patch
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