7 files changed, 68 insertions, 10 deletions

diff --git a/drivers/video/Kconfig b/drivers/video/Kconfig
index c40b9b8b1e7e..702eb933cf88 100644
--- a/drivers/video/Kconfig
+++ b/drivers/video/Kconfig
@@ -554,7 +554,7 @@ config FB_VESA
 
 config FB_IMAC
         bool "Intel-based Macintosh Framebuffer Support"
-        depends on (FB = y) && X86
+        depends on (FB = y) && X86 && EFI
         select FB_CFB_FILLRECT
         select FB_CFB_COPYAREA
         select FB_CFB_IMAGEBLIT
diff --git a/drivers/video/aty/aty128fb.c b/drivers/video/aty/aty128fb.c
index 3e827e04a2aa..106d428b72c9 100644
--- a/drivers/video/aty/aty128fb.c
+++ b/drivers/video/aty/aty128fb.c
@@ -1800,6 +1800,9 @@ static struct backlight_properties aty128_bl_data = {
 
 static void aty128_bl_set_power(struct fb_info *info, int power)
 {
+        if (info->bl_dev == NULL)
+                return;
+
         mutex_lock(&info->bl_mutex);
         up(&info->bl_dev->sem);
         info->bl_dev->props->power = power;
@@ -1828,7 +1831,7 @@ static void aty128_bl_init(struct aty128fb_par *par)
         bd = backlight_device_register(name, par, &aty128_bl_data);
         if (IS_ERR(bd)) {
                 info->bl_dev = NULL;
-                printk("aty128: Backlight registration failed\n");
+                printk(KERN_WARNING "aty128: Backlight registration failed\n");
                 goto error;
         }
 
diff --git a/drivers/video/aty/atyfb_base.c b/drivers/video/aty/atyfb_base.c
index 053ff63365b7..510e4ea296ed 100644
--- a/drivers/video/aty/atyfb_base.c
+++ b/drivers/video/aty/atyfb_base.c
@@ -2199,6 +2199,9 @@ static struct backlight_properties aty_bl_data = {
 
 static void aty_bl_set_power(struct fb_info *info, int power)
 {
+        if (info->bl_dev == NULL)
+                return;
+
         mutex_lock(&info->bl_mutex);
         up(&info->bl_dev->sem);
         info->bl_dev->props->power = power;
@@ -2223,7 +2226,7 @@ static void aty_bl_init(struct atyfb_par *par)
         bd = backlight_device_register(name, par, &aty_bl_data);
         if (IS_ERR(bd)) {
                 info->bl_dev = NULL;
-                printk("aty: Backlight registration failed\n");
+                printk(KERN_WARNING "aty: Backlight registration failed\n");
                 goto error;
         }
 
diff --git a/drivers/video/imacfb.c b/drivers/video/imacfb.c
index ff233b84dec4..18ea4a549105 100644
--- a/drivers/video/imacfb.c
+++ b/drivers/video/imacfb.c
@@ -18,6 +18,8 @@
 #include <linux/screen_info.h>
 #include <linux/slab.h>
 #include <linux/string.h>
+#include <linux/dmi.h>
+#include <linux/efi.h>
 
 #include <asm/io.h>
 
@@ -28,7 +30,7 @@ typedef enum _MAC_TYPE {
         M_I20,
         M_MINI,
         M_MACBOOK,
-        M_NEW
+        M_UNKNOWN
 } MAC_TYPE;
 
 /* --------------------------------------------------------------------- */
@@ -52,10 +54,36 @@ static struct fb_fix_screeninfo imacfb_fix __initdata = {
 };
 
 static int inverse;
-static int model                = M_NEW;
+static int model                = M_UNKNOWN;
 static int manual_height;
 static int manual_width;
 
+static int set_system(struct dmi_system_id *id)
+{
+        printk(KERN_INFO "imacfb: %s detected - set system to %ld\n",
+                id->ident, (long)id->driver_data);
+
+        model = (long)id->driver_data;
+
+        return 0;
+}
+
+static struct dmi_system_id __initdata dmi_system_table[] = {
+        { set_system, "iMac4,1", {
+          DMI_MATCH(DMI_BIOS_VENDOR,"Apple Computer, Inc."),
+          DMI_MATCH(DMI_PRODUCT_NAME,"iMac4,1") }, (void*)M_I17},
+        { set_system, "MacBookPro1,1", {
+          DMI_MATCH(DMI_BIOS_VENDOR,"Apple Computer, Inc."),
+          DMI_MATCH(DMI_PRODUCT_NAME,"MacBookPro1,1") }, (void*)M_I17},
+        { set_system, "MacBook1,1", {
+          DMI_MATCH(DMI_BIOS_VENDOR,"Apple Computer, Inc."),
+          DMI_MATCH(DMI_PRODUCT_NAME,"MacBook1,1")}, (void *)M_MACBOOK},
+        { set_system, "Macmini1,1", {
+          DMI_MATCH(DMI_BIOS_VENDOR,"Apple Computer, Inc."),
+          DMI_MATCH(DMI_PRODUCT_NAME,"Macmini1,1")}, (void *)M_MINI},
+        {},
+};
+
 #define DEFAULT_FB_MEM  1024*1024*16
 
 /* --------------------------------------------------------------------- */
@@ -149,7 +177,6 @@ static int __init imacfb_probe(struct platform_device *dev)
                 screen_info.lfb_linelength = 1472 * 4;
                 screen_info.lfb_base = 0x80010000;
                 break;
-        case M_NEW:
         case M_I20:
                 screen_info.lfb_width = 1680;
                 screen_info.lfb_height = 1050;
@@ -207,6 +234,10 @@ static int __init imacfb_probe(struct platform_device *dev)
                 size_remap = size_total;
         imacfb_fix.smem_len = size_remap;
 
+#ifndef __i386__
+        screen_info.imacpm_seg = 0;
+#endif
+
         if (!request_mem_region(imacfb_fix.smem_start, size_total, "imacfb")) {
                 printk(KERN_WARNING
                        "imacfb: cannot reserve video memory at 0x%lx\n",
@@ -324,8 +355,16 @@ static int __init imacfb_init(void)
         int ret;
         char *option = NULL;
 
-        /* ignore error return of fb_get_options */
-        fb_get_options("imacfb", &option);
+        if (!efi_enabled)
+                return -ENODEV;
+        if (!dmi_check_system(dmi_system_table))
+                return -ENODEV;
+        if (model == M_UNKNOWN)
+                return -ENODEV;
+
+        if (fb_get_options("imacfb", &option))
+                return -ENODEV;
+
         imacfb_setup(option);
         ret = platform_driver_register(&imacfb_driver);
 
diff --git a/drivers/video/matrox/g450_pll.c b/drivers/video/matrox/g450_pll.c
index 440272ad10e7..7c76e079ca7d 100644
--- a/drivers/video/matrox/g450_pll.c
+++ b/drivers/video/matrox/g450_pll.c
@@ -331,7 +331,15 @@ static int __g450_setclk(WPMINFO unsigned int fout, unsigned int pll,
                                         tmp |= M1064_XPIXCLKCTRL_PLL_UP;
                                 }
                                 matroxfb_DAC_out(PMINFO M1064_XPIXCLKCTRL, tmp);
+#ifdef __powerpc__
+                                /* This is necessary to avoid jitter on PowerPC
+                                 * (OpenFirmware) systems, but apparently
+                                 * introduces jitter, at least on a x86-64
+                                 * using DVI.
+                                 * A simple workaround is disable for non-PPC.
+                                 */
                                 matroxfb_DAC_out(PMINFO M1064_XDVICLKCTRL, 0);
+#endif /* __powerpc__ */
                                 matroxfb_DAC_out(PMINFO M1064_XPWRCTRL, xpwrctrl);
 
                                 matroxfb_DAC_unlock_irqrestore(flags);
diff --git a/drivers/video/nvidia/nv_backlight.c b/drivers/video/nvidia/nv_backlight.c
index b45f577094ac..14c37c42191c 100644
--- a/drivers/video/nvidia/nv_backlight.c
+++ b/drivers/video/nvidia/nv_backlight.c
@@ -112,6 +112,8 @@ static struct backlight_properties nvidia_bl_data = {
 
 void nvidia_bl_set_power(struct fb_info *info, int power)
 {
+        if (info->bl_dev == NULL)
+                return;
         mutex_lock(&info->bl_mutex);
         up(&info->bl_dev->sem);
         info->bl_dev->props->power = power;
@@ -140,7 +142,7 @@ void nvidia_bl_init(struct nvidia_par *par)
         bd = backlight_device_register(name, par, &nvidia_bl_data);
         if (IS_ERR(bd)) {
                 info->bl_dev = NULL;
-                printk("nvidia: Backlight registration failed\n");
+                printk(KERN_WARNING "nvidia: Backlight registration failed\n");
                 goto error;
         }
 
diff --git a/drivers/video/riva/fbdev.c b/drivers/video/riva/fbdev.c
index 9823ba939e11..511c362d3b0d 100644
--- a/drivers/video/riva/fbdev.c
+++ b/drivers/video/riva/fbdev.c
@@ -354,6 +354,9 @@ static struct backlight_properties riva_bl_data = {
 
 static void riva_bl_set_power(struct fb_info *info, int power)
 {
+        if (info->bl_dev == NULL)
+                return;
+
         mutex_lock(&info->bl_mutex);
         up(&info->bl_dev->sem);
         info->bl_dev->props->power = power;
@@ -382,7 +385,7 @@ static void riva_bl_init(struct riva_par *par)
         bd = backlight_device_register(name, par, &riva_bl_data);
         if (IS_ERR(bd)) {
                 info->bl_dev = NULL;
-                printk("riva: Backlight registration failed\n");
+                printk(KERN_WARNING "riva: Backlight registration failed\n");
                 goto error;
         }