Please try this one.
--
Robert Millan
The DRM opt-in fallacy: "Your data belongs to us. We will decide when (and
how) you may access your data; but nobody's threatening your freedom: we
still allow you to remove your data and not access it at all."
Index: kern/i386/pc/startup.S
===================================================================
--- kern/i386/pc/startup.S (revision 2439)
+++ kern/i386/pc/startup.S (working copy)
@@ -1733,6 +1733,49 @@
ret
/*
+ * grub_vbe_status_t grub_vbe_bios_getset_dac_palette_width (int set, int *dac_mask_size)
+ *
+ * Register allocations for parameters:
+ * %eax set
+ * %edx *dac_mask_size
+ */
+FUNCTION(grub_vbe_bios_getset_dac_palette_width)
+ pushl %ebp
+ pushl %ebx
+
+ xorl %ebx, %ebx
+
+ testl %eax, %eax
+ jne 1f
+ incb %bl
+1:
+
+ movl (%edx), %eax
+ movb %al, %bh
+
+ call prot_to_real
+ .code16
+
+ movw $0x4f08, %ax
+ int $0x10
+
+ movw %ax, %dx /* real_to_prot destroys %eax. */
+
+ DATA32 call real_to_prot
+ .code32
+
+ movb %bh, %al
+ movl %eax, (%edx)
+
+ /* Return value in %eax. */
+ xorl %eax, %eax
+ movw %dx, %ax
+
+ popl %ebx
+ popl %ebp
+ ret
+
+/*
* grub_vbe_status_t grub_vbe_bios_set_memory_window (grub_uint32_t window,
* grub_uint32_t position);
*
Index: video/i386/pc/vbe.c
===================================================================
--- video/i386/pc/vbe.c (revision 2439)
+++ video/i386/pc/vbe.c (working copy)
@@ -300,6 +300,23 @@
/* Make copy of mode info block. */
grub_memcpy (mode_info, mi_tmp, sizeof (*mode_info));
+
+ if (mode_info->bits_per_pixel <= 8)
+ {
+ int width = 8;
+ status = 0;
+
+ if (controller_info.capabilities & 0x00000001)
+ status = grub_vbe_bios_set_dac_palette_width (& width);
+
+ if (status != 0x004F)
+ /* 6 is default after mode reset. */
+ width = 6;
+
+ mode_info->red_mask_size = mode_info->green_mask_size
+ = mode_info->blue_mask_size = mode_info->rsvd_mask_size
+ = width;
+ }
}
else
/* Just clear mode info block if it isn't a VESA mode. */
Index: include/grub/i386/pc/vbe.h
===================================================================
--- include/grub/i386/pc/vbe.h (revision 2439)
+++ include/grub/i386/pc/vbe.h (working copy)
@@ -181,6 +181,11 @@
grub_vbe_status_t EXPORT_FUNC(grub_vbe_bios_get_mode_info) (grub_uint32_t mode,
struct grub_vbe_mode_info_block *mode_info);
+grub_vbe_status_t EXPORT_FUNC(grub_vbe_bios_getset_dac_palette_width) (int set, int *width);
+
+#define grub_vbe_bios_get_dac_palette_width(width) grub_vbe_bios_getset_dac_palette_width(0, (width))
+#define grub_vbe_bios_set_dac_palette_width(width) grub_vbe_bios_getset_dac_palette_width(1, (width))
+
/* Call VESA BIOS 0x4f02 to set video mode, return status. */
grub_vbe_status_t EXPORT_FUNC(grub_vbe_bios_set_mode) (grub_uint32_t mode,
struct grub_vbe_crtc_info_block *crtc_info);
