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| author | H. Peter Anvin <hpa@zytor.com> | 2010-02-20 00:21:38 +0300 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2010-02-20 00:21:38 +0300 |
| commit | 8e92dc767abb58357e696a48fc3d8ce615a9c01a (patch) | |
| tree | 5e36758eb4f4bdf57be5d63255b1c82bb9a945e6 /arch/x86/boot | |
| parent | eb572a5c7951288e265b3e8f9a5d37b6abb2e996 (diff) | |
| download | linux-8e92dc767abb58357e696a48fc3d8ce615a9c01a.tar.xz | |
x86, setup: Don't skip mode setting for the standard VGA modes
The code for setting standard VGA modes probes for the current mode,
and skips the mode setting if the mode is 3 (color text 80x25) or 7
(mono text 80x25). Unfortunately, there are BIOSes, including the
VMware BIOS, which report the previous mode if function 0F is queried
while the screen is in a VESA mode, and of course, nothing can help a
mode poked directly into the hardware.
As such, the safe option is to set the mode anyway, and only query to
see if we should be using mode 7 rather than mode 3. People who don't
want any mode setting at all should probably use vga=0x0f04
(VIDEO_CURRENT_MODE). It's possible that should be the kernel
default.
Reported-by Rene Arends <R.R.Arends@hro.nl>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
LKML-Reference: <tip-*@git.kernel.org>
Diffstat (limited to 'arch/x86/boot')
| -rw-r--r-- | arch/x86/boot/video-vga.c | 9 |
1 files changed, 1 insertions, 8 deletions
diff --git a/arch/x86/boot/video-vga.c b/arch/x86/boot/video-vga.c index 819caa1f2008..ed7aeff786b2 100644 --- a/arch/x86/boot/video-vga.c +++ b/arch/x86/boot/video-vga.c @@ -42,22 +42,15 @@ static u8 vga_set_basic_mode(void) { struct biosregs ireg, oreg; u16 ax; - u8 rows; u8 mode; initregs(&ireg); + /* Query current mode */ ax = 0x0f00; intcall(0x10, &ireg, &oreg); mode = oreg.al; - set_fs(0); - rows = rdfs8(0x484); /* rows minus one */ - - if ((oreg.ax == 0x5003 || oreg.ax == 0x5007) && - (rows == 0 || rows == 24)) - return mode; - if (mode != 3 && mode != 7) mode = 3; |