linux/drivers/video/console
Yannick Heneault 554ec37aca vgacon: check for efi machine
It seems there is a small problem of VGA palette corruption on EFI
machine.  When the kernel initializes the architecture, it checks if the
machine is a EFI machine and assumes that a VGA console can exist.

When it initializes the console in vgacon_startup it checks if it can
really use the VGA console.  I think this is where a check is missing.
Currently, the function can fail if a VESA boot mode is detected but not if
a EFI boot mode was used.

Thus vgacon_startup() doesn't fail and initialize the video card for a real
VGA mode.  This function changes the first 16entries of the VGA palette.

When the efifb driver kicks in, the palette is not restored to default
ramp value, thus the 16 first entry remain in a modified state.  The
following patch prevent this corruption.

Signed-off-by: Yannick Heneault <yheneaul@matrox.com>
Cc: Dave Airlie <airlied@linux.ie>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2011-01-13 08:03:12 -08:00
..
bitblit.c fbcon: uninline four foo_update_attr() functions 2010-08-11 08:59:09 -07:00
dummycon.c
fbcon_ccw.c fbcon: uninline four foo_update_attr() functions 2010-08-11 08:59:09 -07:00
fbcon_cw.c fbcon: uninline four foo_update_attr() functions 2010-08-11 08:59:09 -07:00
fbcon_rotate.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
fbcon_rotate.h fbcon: fix rotate upside down crash 2009-08-07 10:39:55 -07:00
fbcon_ud.c fbcon: uninline four foo_update_attr() functions 2010-08-11 08:59:09 -07:00
fbcon.c fbcon: fix lockdep warning from fbcon_deinit() 2010-09-22 17:22:39 -07:00
fbcon.h fb: add hooks to handle KDB enter/exit 2010-08-05 09:22:31 -05:00
font_6x11.c
font_7x14.c
font_8x8.c
font_8x16.c
font_10x18.c
font_acorn_8x8.c
font_mini_4x6.c
font_pearl_8x8.c
font_sun8x16.c
font_sun12x22.c
fonts.c
Kconfig ARM: Disable VGA console for ARM in most cases 2010-07-05 16:31:46 +03:00
Makefile sparc: Kill PROM console driver. 2009-09-15 17:04:38 -07:00
mdacon.c include cleanup: Update gfp.h and slab.h includes to prepare for breaking implicit slab.h inclusion from percpu.h 2010-03-30 22:02:32 +09:00
newport_con.c drivers/video/console/newport_con.c: fix read outside array bounds 2009-09-23 07:39:56 -07:00
softcursor.c
sticon.c
sticore.c tree-wide: fix assorted typos all over the place 2009-12-04 15:39:55 +01:00
tileblit.c
vgacon.c vgacon: check for efi machine 2011-01-13 08:03:12 -08:00