The patch titled
i386: set 6-bit DAC channel properties in vesa video setup
has been added to the -mm tree. Its filename is
i386-set-6-bit-dac-channel-properties-in-vesa-video.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: i386: set 6-bit DAC channel properties in vesa video setup
From: "Antonino A. Daplas" <[EMAIL PROTECTED]>
If the video BIOS is not capable of switching or failed to switch the hardware
to 8-bit DAC, the channel properties are not set. This leads to a blank (all
black) display with vesafb at 8 bpp. Fix by defaulting to a 6-bit DAC.
Signed-off-by: Antonino Daplas <[EMAIL PROTECTED]>
Cc: "H. Peter Anvin" <[EMAIL PROTECTED]>
Cc: Andi Kleen <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
---
arch/i386/boot/video-vesa.c | 27 ++++++++++++++-------------
1 files changed, 14 insertions(+), 13 deletions(-)
diff -puN
arch/i386/boot/video-vesa.c~i386-set-6-bit-dac-channel-properties-in-vesa-video
arch/i386/boot/video-vesa.c
---
a/arch/i386/boot/video-vesa.c~i386-set-6-bit-dac-channel-properties-in-vesa-video
+++ a/arch/i386/boot/video-vesa.c
@@ -153,19 +153,21 @@ static int vesa_set_mode(struct mode_inf
/* Switch DAC to 8-bit mode */
static void vesa_dac_set_8bits(void)
{
- u16 ax, bx;
- u8 dac_size;
+ u8 dac_size = 6;
- ax = 0x4f08;
- bx = 0x0800;
- asm volatile(INT10
- : "+a" (ax), "+b" (bx)
- : : "ecx", "edx", "esi", "edi");
-
- if (ax != 0x004f)
- return;
+ /* If possible, switch the DAC to 8-bit mode */
+ if (vginfo.capabilities & 1) {
+ u16 ax, bx;
- dac_size = bx >> 8;
+ ax = 0x4f08;
+ bx = 0x0800;
+ asm volatile(INT10
+ : "+a" (ax), "+b" (bx)
+ : : "ecx", "edx", "esi", "edi");
+
+ if (ax == 0x004f)
+ dac_size = bx >> 8;
+ }
/* Set the color sizes to the DAC size, and offsets to 0 */
boot_params.screen_info.red_size = dac_size;
@@ -219,8 +221,7 @@ static void vesa_store_mode_params_graph
/* General parameters */
boot_params.screen_info.lfb_size = vginfo.total_memory;
- /* If possible, switch the DAC to 8-bit mode */
- if (vminfo.bpp <= 8 && (vginfo.capabilities & 1))
+ if (vminfo.bpp <= 8)
vesa_dac_set_8bits();
vesa_store_pm_info();
_
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fbcon-use-struct-device-instead-of-struct-class_device.patch
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fbcon-allow-fbcon-to-use-the-primary-display-driver-fix.patch
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radeonfb-add-support-for-radeon-xpress-200m-rs485.patch
nvidiafb-add-proper-support-for-geforce-7600-chipset.patch
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epson1355fb-color-setting-fixes.patch
ffb-the-pseudo_palette-is-only-16-elements-long.patch
fm2fb-the-pseudo_palette-is-only-16-elements-long.patch
gbefb-the-pseudo_palette-is-only-16-elements-long.patch
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offb-the-pseudo_palette-is-only-16-elements-long.patch
platinumfb-the-pseudo_palette-is-only-16-elements.patch
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sunxvr2500fb-fix-pseudo_palette-array-size.patch
sunxvr500fb-fix-pseudo_palette-array-size.patch
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tx3912fb-fix-improper-assignment-of-info-pseudo_palette.patch
atyfb-the-pseudo_palette-is-only-16-elements-long.patch
radeonfb-the-pseudo_palette-is-only-16-elements-long.patch
i810fb-the-pseudo_palette-is-only-16-elements-long.patch
intelfb-the-pseudo_palette-is-only-16-elements-long.patch
sisfb-fix-pseudo_palette-array-size-and-overrun.patch
matroxfb-color-setting-fixes.patch
pm3fb-fillrect-acceleration.patch
i386-set-6-bit-dac-channel-properties-in-vesa-video.patch
pm3fb-possible-cleanups.patch
vt8623fbc-make-code-static.patch
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