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authorDave Airlie <airlied@redhat.com>2013-01-24 14:14:19 +1000
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-02-28 06:59:03 -0800
commitdf28f4890263a0540b395402b43b57f047ccf7d5 (patch)
tree4b8430b47afc77c27f42b094ddebd03b93982974 /include
parentae4c05e0232e869cf2418ac6c0c862bb5287d672 (diff)
vgacon/vt: clear buffer attributes when we load a 512 character font (v2)
commit 2a2483072393b27f4336ab068a1f48ca19ff1c1e upstream. When we switch from 256->512 byte font rendering mode, it means the current contents of the screen is being reinterpreted. The bit that holds the high bit of the 9-bit font, may have been previously set, and thus the new font misrenders. The problem case we see is grub2 writes spaces with the bit set, so it ends up with data like 0x820, which gets reinterpreted into 0x120 char which the font translates into G with a circumflex. This flashes up on screen at boot and is quite ugly. A current side effect of this patch though is that any rendering on the screen changes color to a slightly darker color, but at least the screen no longer corrupts. v2: as suggested by hpa, always clear the attribute space, whether we are are going to or from 512 chars. Signed-off-by: Dave Airlie <airlied@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/vt_kern.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/vt_kern.h b/include/linux/vt_kern.h
index e33d77f15bda..49e39d4396d0 100644
--- a/include/linux/vt_kern.h
+++ b/include/linux/vt_kern.h
@@ -47,6 +47,7 @@ int con_set_cmap(unsigned char __user *cmap);
int con_get_cmap(unsigned char __user *cmap);
void scrollback(struct vc_data *vc, int lines);
void scrollfront(struct vc_data *vc, int lines);
+void clear_buffer_attributes(struct vc_data *vc);
void update_region(struct vc_data *vc, unsigned long start, int count);
void redraw_screen(struct vc_data *vc, int is_switch);
#define update_screen(x) redraw_screen(x, 0)