Attachment 12414 Details for Bug 11527 – Updated backlight control methods

Updated backlight control methods

intel-backlight-enhancements-2.patch (text/x-diff), 19.03 KB, created by Jesse Barnes on 2007-11-08 16:00:46 UTC

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Creator: Jesse Barnes

Created: 2007-11-08 16:00:46 UTC

Size: 19.03 KB

patch

obsolete

>diff --git a/src/i830.h b/src/i830.h
>index 57f0544..17d2fe2 100644
>--- a/src/i830.h
>+++ b/src/i830.h
>@@ -295,6 +295,57 @@ enum last_3d {
>     LAST_3D_ROTATION
> };
> 
>+/*
>+ * Backlight control has some unfortunate properties:
>+ *   - many machines won't give us brightness change notifications
>+ *     o brightness hotkeys
>+ *     o events like AC plug/unplug (can be controlled via _DOS setting)
>+ *     o ambient light sensor triggered changes
>+ *   - some machines use the so-called "legacy" backlight interface
>+ *     o resulting brightness is a combo of LBB and PWM values
>+ *     o LBB sits in config space
>+ *   - some machines have ACPI methods for changing brightness
>+ *     o one of the few ways the X server and firmware can stay in sync
>+ *   - new machines have the IGD OpRegion interface available
>+ *     o a reliable way of keeping the firmware and X in sync
>+ *
>+ * So the real problem is on machines where ACPI or OpRegion methods aren't
>+ * available.  In that case, problems can occur:
>+ *   1) the BIOS and X will have different ideas of what the brightness is,
>+ *      leading to unexpected results when the brightness is increased or
>+ *      decreased via hotkey or X protocol
>+ *   2) unless X takes the legacy register into account, machines using it
>+ *      may prevent X from raising the brightness above 0 if the firmware
>+ *      set LBB to 0
>+ * Given these problems, we provide the user with a selection of methods,
>+ * so they can choose an ideal one for their platform (assuming our quirk
>+ * code picks the wrong one).
>+ *
>+ * Four different methods are available:
>+ *   NATIVE:  only ever touch the native backlight control registers
>+ *     This method may be susceptible to problem (2) above if the firmware
>+ *     modifies the legacy registers.
>+ *   LEGACY:  only ever touch the legacy backlight control registers
>+ *     This method may be susceptible to problem (1) above if the firmware
>+ *     also modifies the legacy registers.
>+ *   COMBO:  try to use both sets
>+ *     In this case, the driver will try to modify both sets of registers
>+ *     if needed.  To avoid problem (2) above it may set the LBB register
>+ *     to a non-zero value if the brightness is to be increased.  It's still
>+ *     susceptible to problem (1), but to a lesser extent than the LEGACY only
>+ *     method.
>+ *   KERNEL:  use kernel methods for controlling the backlight
>+ *     This is only available on some platforms, but where present this can
>+ *     provide the best user experience.
>+ */
>+
>+enum backlight_control {
>+    NATIVE = 0,
>+    LEGACY,
>+    COMBO,
>+    KERNEL,
>+};
>+
> typedef struct _I830Rec {
>    unsigned char *MMIOBase;
>    unsigned char *GTTBase;
>@@ -498,6 +549,8 @@ typedef struct _I830Rec {
> 
>    int ddc2;
> 
>+   enum backlight_control backlight_control_method;
>+
>    CARD32 saveDSPACNTR;
>    CARD32 saveDSPBCNTR;
>    CARD32 savePIPEACONF;
>diff --git a/src/i830_lvds.c b/src/i830_lvds.c
>index 0b6b192..93da468 100644
>--- a/src/i830_lvds.c
>+++ b/src/i830_lvds.c
>@@ -29,6 +29,13 @@
> #include "config.h"
> #endif
> 
>+#include <fcntl.h>
>+#include <unistd.h>
>+#include <stdio.h>
>+#include <stdlib.h>
>+#include <sys/stat.h>
>+#include <sys/types.h>
>+
> #include "xf86.h"
> #include "i830.h"
> #include "i830_bios.h"
>@@ -44,67 +51,111 @@ struct i830_lvds_priv {
> 
>     /* restore backlight to this value */
>     int		    backlight_duty_cycle;
>+
>+    void (*set_backlight)(xf86OutputPtr output, int level);
>+    int (*get_backlight)(xf86OutputPtr output);
>+    int backlight_max;
> };
> 
>-/**
>- * Use legacy backlight controls?
>- *
>- * \param pI830 device in question
>- *
>- * Returns TRUE if legacy backlight should be used, false otherwise.
>+#define BACKLIGHT_CLASS "/sys/class/backlight"
>+
>+/*
>+ * List of available kernel interfaces in priority order
>  */
>-static int
>-i830_lvds_backlight_legacy(I830Ptr pI830)
>+static char *backlight_interfaces[] = {
>+    "acpi_video1",
>+    "acpi_video0",
>+    "thinkpad_screen",
>+};
>+/*
>+ * Must be long enough for BACKLIGHT_CLASS + '/' + longest in above table +
>+ * '/' + "max_backlight"
>+ */
>+#define BACKLIGHT_PATH_LEN 80
>+
>+static int backlight_index;
>+
>+static Bool
>+i830_kernel_backlight_available(xf86OutputPtr output)
>+{
>+    ScrnInfoPtr pScrn = output->scrn;
>+    struct stat buf;
>+    char path[BACKLIGHT_PATH_LEN];
>+    int i;
>+
>+    for (i = 0; i < sizeof(backlight_interfaces); i++) {
>+	sprintf(path, "%s/%s", BACKLIGHT_CLASS, backlight_interfaces[i]);
>+	if (!stat(path, &buf)) {
>+	    backlight_index = i;
>+	    xf86DrvMsg(pScrn->scrnIndex, X_INFO, "found backlight control "
>+		       "method %s\n", path);
>+	    return 1;
>+	}
>+    }
>+
>+    return 0;
>+}
>+
>+/* Try to figure out which backlight control method to use */
>+static void
>+i830_set_lvds_backlight_method(xf86OutputPtr output)
> {
>+    ScrnInfoPtr pScrn = output->scrn;
>+    I830Ptr pI830 = I830PTR(pScrn);
>     CARD32 blc_pwm_ctl, blc_pwm_ctl2;
>+    enum backlight_control method = NATIVE; /* Default to native */
> 
>-    /* 965GM+ change the location of the legacy control bit */
>-    if (IS_I965GM(pI830)) {
>+    /* ...but use combo if LBB is in use */
>+    if (i830_kernel_backlight_available(output)) {
>+	    method = KERNEL;
>+    } else if (IS_I965GM(pI830)) {
> 	blc_pwm_ctl2 = INREG(BLC_PWM_CTL2);
> 	if (blc_pwm_ctl2 & BLM_LEGACY_MODE2)
>-	    return TRUE;
>+	    method = COMBO;
>     } else {
> 	blc_pwm_ctl = INREG(BLC_PWM_CTL);
> 	if (blc_pwm_ctl & BLM_LEGACY_MODE)
>-	    return TRUE;
>+	    method = COMBO;
>     }
>-    return FALSE;
>+
>+
>+    pI830->backlight_control_method = method;
> }
> 
>-/**
>- * Sets the backlight level.
>- *
>- * \param level backlight level, from 0 to i830_lvds_get_max_backlight().
>+/*
>+ * Native methods
>  */
> static void
>-i830_lvds_set_backlight(xf86OutputPtr output, int level)
>+i830_lvds_set_backlight_native(xf86OutputPtr output, int level)
> {
>     ScrnInfoPtr pScrn = output->scrn;
>     I830Ptr pI830 = I830PTR(pScrn);
>     CARD32 blc_pwm_ctl;
> 
>-    if (i830_lvds_backlight_legacy(pI830))
>-#if XSERVER_LIBPCIACCESS
>-	pci_device_cfg_write_u8 (pI830->PciInfo, 0xfe, LEGACY_BACKLIGHT_BRIGHTNESS);
>-#else
>-	pciWriteByte(pI830->PciTag, LEGACY_BACKLIGHT_BRIGHTNESS, 0xfe);
>-#endif
>-
>     blc_pwm_ctl = INREG(BLC_PWM_CTL);
>     blc_pwm_ctl &= ~BACKLIGHT_DUTY_CYCLE_MASK;
>     OUTREG(BLC_PWM_CTL, blc_pwm_ctl | (level << BACKLIGHT_DUTY_CYCLE_SHIFT));
> }
> 
>-/**
>- * Returns the maximum level of the backlight duty cycle field.
>- */
>-static CARD32
>-i830_lvds_get_max_backlight(xf86OutputPtr output)
>+static int
>+i830_lvds_get_backlight_native(xf86OutputPtr output)
> {
>     ScrnInfoPtr pScrn = output->scrn;
>-    I830Ptr	pI830 = I830PTR(pScrn);
>-    CARD32	pwm_ctl = INREG(BLC_PWM_CTL);
>-    CARD32	val;
>+    I830Ptr pI830 = I830PTR(pScrn);
>+    CARD32 blc_pwm_ctl;
>+
>+    blc_pwm_ctl = INREG(BLC_PWM_CTL);
>+    blc_pwm_ctl &= BACKLIGHT_DUTY_CYCLE_MASK;
>+    return blc_pwm_ctl;
>+}
>+
>+static int
>+i830_lvds_get_backlight_max_native(xf86OutputPtr output)
>+{
>+    ScrnInfoPtr pScrn = output->scrn;
>+    I830Ptr pI830 = I830PTR(pScrn);
>+    CARD32 pwm_ctl = INREG(BLC_PWM_CTL);
>+    int val;
> 
>     if (IS_I965GM(pI830)) {
> 	val = ((pwm_ctl & BACKLIGHT_MODULATION_FREQ_MASK2) >>
>@@ -113,15 +164,166 @@ i830_lvds_get_max_backlight(xf86OutputPtr output)
> 	val = ((pwm_ctl & BACKLIGHT_MODULATION_FREQ_MASK) >>
> 	       BACKLIGHT_MODULATION_FREQ_SHIFT) * 2;
>     }
>-    
>+
>+    return val;
>+}
>+
>+/*
>+ * Legacy methods
>+ */
>+static void
>+i830_lvds_set_backlight_legacy(xf86OutputPtr output, int level)
>+{
>+    ScrnInfoPtr pScrn = output->scrn;
>+    I830Ptr pI830 = I830PTR(pScrn);
>+
>+#if XSERVER_LIBPCIACCESS
>+    pci_device_cfg_write_u8(pI830->PciInfo, level,
>+			    LEGACY_BACKLIGHT_BRIGHTNESS);
>+#else
>+    pciWriteByte(pI830->PciTag, LEGACY_BACKLIGHT_BRIGHTNESS, level);
>+#endif
>+}
>+
>+static int
>+i830_lvds_get_backlight_legacy(xf86OutputPtr output)
>+{
>+    ScrnInfoPtr pScrn = output->scrn;
>+    I830Ptr pI830 = I830PTR(pScrn);
>+    CARD8 lbb;
>+
>+#if XSERVER_LIBPCIACCESS
>+    pci_device_cfg_read_u8(pI830->PciInfo, &lbb, LEGACY_BACKLIGHT_BRIGHTNESS);
>+#else
>+    lbb = pciReadByte(pI830->PciTag, LEGACY_BACKLIGHT_BRIGHTNESS);
>+#endif
>+
>+    return lbb;
>+}
>+
>+/*
>+ * Combo methods
>+ */
>+static void
>+i830_lvds_set_backlight_combo(xf86OutputPtr output, int level)
>+{
>+    ScrnInfoPtr pScrn = output->scrn;
>+    I830Ptr pI830 = I830PTR(pScrn);
>+    CARD32 blc_pwm_ctl;
>+    CARD8 lbb;
>+
>+#if XSERVER_LIBPCIACCESS
>+    pci_device_cfg_read_u8(pI830->PciInfo, &lbb, LEGACY_BACKLIGHT_BRIGHTNESS);
>+#else
>+    lbb = pciReadByte(pI830->PciTag, LEGACY_BACKLIGHT_BRIGHTNESS);
>+#endif
>     /*
>-     * In legacy control mode, backlight value is calculated:
>-     * if (LBB[7:0] != 0xff)
>-     *     backlight = BLC_PWM_CTL[15:0] *  BPC[7:0]
>-     * else
>-     *     backlight = BLC_PWM_CTL[15:0]
>+     * If LBB is zero and we're shooting for a non-zero brightness level,
>+     * we have to increase LBB by at least 1.
>      */
>-    return val;
>+    if (!lbb && level) {
>+#if XSERVER_LIBPCIACCESS
>+	pci_device_cfg_write_u8(pI830->PciInfo, 1,
>+				LEGACY_BACKLIGHT_BRIGHTNESS);
>+#else
>+	pciWriteByte(pI830->PciTag, LEGACY_BACKLIGHT_BRIGHTNESS, 1);
>+#endif
>+    }
>+
>+    blc_pwm_ctl = INREG(BLC_PWM_CTL);
>+    blc_pwm_ctl &= ~BACKLIGHT_DUTY_CYCLE_MASK;
>+    OUTREG(BLC_PWM_CTL, blc_pwm_ctl | (level << BACKLIGHT_DUTY_CYCLE_SHIFT));
>+}
>+
>+static int
>+i830_lvds_get_backlight_combo(xf86OutputPtr output)
>+{
>+    ScrnInfoPtr pScrn = output->scrn;
>+    I830Ptr pI830 = I830PTR(pScrn);
>+    CARD32 blc_pwm_ctl;
>+
>+    blc_pwm_ctl = INREG(BLC_PWM_CTL);
>+    blc_pwm_ctl &= BACKLIGHT_DUTY_CYCLE_MASK;
>+    return blc_pwm_ctl;
>+}
>+
>+/*
>+ * Kernel methods
>+ */
>+static void
>+i830_lvds_set_backlight_kernel(xf86OutputPtr output, int level)
>+{
>+    ScrnInfoPtr pScrn = output->scrn;
>+    char path[BACKLIGHT_PATH_LEN], val[5];
>+    int fd;
>+
>+    sprintf(val, "%3d\n", level);
>+
>+    sprintf(path, "%s/%s/brightness", BACKLIGHT_CLASS,
>+	    backlight_interfaces[backlight_index]);
>+    fd = open(path, O_RDWR);
>+    if (fd == -1) {
>+	xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "failed to open %s for backlight "
>+		   "control\n", path);
>+	return;
>+    }
>+
>+    write(fd, val, 5);
>+    close(fd);
>+}
>+
>+static int
>+i830_lvds_get_backlight_kernel(xf86OutputPtr output)
>+{
>+    ScrnInfoPtr pScrn = output->scrn;
>+    char path[BACKLIGHT_PATH_LEN], val[5];
>+    int fd;
>+
>+    sprintf(path, "%s/%s/brightness", BACKLIGHT_CLASS,
>+	    backlight_interfaces[backlight_index]);
>+    fd = open(path, O_RDWR);
>+    if (fd == -1) {
>+	xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "failed to open %s for backlight "
>+		   "control\n", path);
>+	return 0;
>+    }
>+
>+    if (read(fd, val, 5) == -1)
>+	goto out_err;
>+
>+    close(fd);
>+    return atoi(val);
>+
>+out_err:
>+    close(fd);
>+    return 0;
>+}
>+
>+static int
>+i830_lvds_get_backlight_max_kernel(xf86OutputPtr output)
>+{
>+    ScrnInfoPtr pScrn = output->scrn;
>+    char path[BACKLIGHT_PATH_LEN], val[5];
>+    int fd;
>+
>+    sprintf(path, "%s/%s/max_brightness", BACKLIGHT_CLASS,
>+	    backlight_interfaces[backlight_index]);
>+    fd = open(path, O_RDWR);
>+    if (fd == -1) {
>+	xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "failed to open %s for backlight "
>+		   "control\n", path);
>+	return 0;
>+    }
>+
>+    if (read(fd, val, 5) == -1)
>+	goto out_err;
>+
>+    close(fd);
>+    return atoi(val);
>+
>+out_err:
>+    close(fd);
>+    return 0;
> }
> 
> /**
>@@ -142,9 +344,9 @@ i830SetLVDSPanelPower(xf86OutputPtr output, Bool on)
> 	    pp_status = INREG(PP_STATUS);
> 	} while ((pp_status & PP_ON) == 0);
> 
>-	i830_lvds_set_backlight(output, dev_priv->backlight_duty_cycle);
>+	dev_priv->set_backlight(output, dev_priv->backlight_duty_cycle);
>     } else {
>-	i830_lvds_set_backlight(output, 0);
>+	dev_priv->set_backlight(output, 0);
> 
> 	OUTREG(PP_CONTROL, INREG(PP_CONTROL) & ~POWER_TARGET_ON);
> 	do {
>@@ -179,14 +381,13 @@ i830_lvds_save (xf86OutputPtr output)
>     pI830->savePP_CONTROL = INREG(PP_CONTROL);
>     pI830->savePP_CYCLE = INREG(PP_CYCLE);
>     pI830->saveBLC_PWM_CTL = INREG(BLC_PWM_CTL);
>-    dev_priv->backlight_duty_cycle = (pI830->saveBLC_PWM_CTL &
>-				      BACKLIGHT_DUTY_CYCLE_MASK);
>+    dev_priv->backlight_duty_cycle = dev_priv->get_backlight(output);
> 
>     /*
>      * If the light is off at server startup, just make it full brightness
>      */
>     if (dev_priv->backlight_duty_cycle == 0)
>-	dev_priv->backlight_duty_cycle = i830_lvds_get_max_backlight(output);
>+	dev_priv->backlight_duty_cycle = dev_priv->backlight_max;
> }
> 
> static void
>@@ -390,31 +591,40 @@ i830_lvds_destroy (xf86OutputPtr output)
> #ifdef RANDR_12_INTERFACE
> #define BACKLIGHT_NAME	"BACKLIGHT"
> static Atom backlight_atom;
>+
>+/*
>+ * Backlight control lets the user select how the driver should manage
>+ * backlight changes:  using the legacy interface, the native interface,
>+ * or not at all.
>+ */
>+#define BACKLIGHT_CONTROL_NAME "BACKLIGHT_CONTROL"
>+static Atom backlight_control_atom;
> #endif /* RANDR_12_INTERFACE */
> 
> static void
> i830_lvds_create_resources(xf86OutputPtr output)
> {
> #ifdef RANDR_12_INTERFACE
>+    ScrnInfoPtr		    pScrn = output->scrn;
>+    I830Ptr		    pI830 = I830PTR(pScrn);
>     I830OutputPrivatePtr    intel_output = output->driver_private;
>     struct i830_lvds_priv   *dev_priv = intel_output->dev_priv;
>-    ScrnInfoPtr		    pScrn = output->scrn;
>-    INT32		    range[2];
>+    INT32		    backlight_range[2], backlight_control_range[2];
>     int			    data, err;
> 
>     /* Set up the backlight property, which takes effect immediately
>-     * and accepts values only within the range.
>+     * and accepts values only within the backlight_range.
>      *
>      * XXX: Currently, RandR doesn't verify that properties set are
>-     * within the range.
>+     * within the backlight_range.
>      */
>     backlight_atom = MakeAtom(BACKLIGHT_NAME, sizeof(BACKLIGHT_NAME) - 1,
> 	TRUE);
> 
>-    range[0] = 0;
>-    range[1] = i830_lvds_get_max_backlight(output);
>+    backlight_range[0] = 0;
>+    backlight_range[1] = dev_priv->backlight_max;
>     err = RRConfigureOutputProperty(output->randr_output, backlight_atom,
>-				    FALSE, TRUE, FALSE, 2, range);
>+				    FALSE, TRUE, FALSE, 2, backlight_range);
>     if (err != 0) {
> 	xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
> 		   "RRConfigureOutputProperty error, %d\n", err);
>@@ -429,6 +639,30 @@ i830_lvds_create_resources(xf86OutputPtr output)
> 		   "RRChangeOutputProperty error, %d\n", err);
>     }
> 
>+    /*
>+     * Now setup the control selection property
>+     */
>+    backlight_control_atom = MakeAtom(BACKLIGHT_CONTROL_NAME,
>+				      sizeof(BACKLIGHT_CONTROL_NAME) - 1, TRUE);
>+    backlight_control_range[0] = 0;
>+    backlight_control_range[1] = 4;
>+    err = RRConfigureOutputProperty(output->randr_output,
>+				    backlight_control_atom, FALSE, TRUE, FALSE,
>+				    2, backlight_control_range);
>+    if (err != 0) {
>+	xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
>+		   "RRConfigureOutputProperty error, %d\n", err);
>+    }
>+  
>+    data = pI830->backlight_control_method;
>+    err = RRChangeOutputProperty(output->randr_output, backlight_control_atom,
>+				 XA_INTEGER, 32, PropModeReplace, 1, &data,
>+				 FALSE, TRUE);
>+    if (err != 0) {
>+	xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
>+		   "RRChangeOutputProperty error, %d\n", err);
>+    }
>+
> #endif /* RANDR_12_INTERFACE */
> }
> 
>@@ -437,6 +671,8 @@ static Bool
> i830_lvds_set_property(xf86OutputPtr output, Atom property,
> 		       RRPropertyValuePtr value)
> {
>+    ScrnInfoPtr		    pScrn = output->scrn;
>+    I830Ptr		    pI830 = I830PTR(pScrn);
>     I830OutputPrivatePtr    intel_output = output->driver_private;
>     struct i830_lvds_priv   *dev_priv = intel_output->dev_priv;
>     
>@@ -450,15 +686,80 @@ i830_lvds_set_property(xf86OutputPtr output, Atom property,
> 	}
> 
> 	val = *(INT32 *)value->data;
>-	if (val < 0 || val > i830_lvds_get_max_backlight(output))
>+	if (val < 0 || val > dev_priv->backlight_max)
> 	    return FALSE;
> 
>-	if (val != dev_priv->backlight_duty_cycle)
>-	{
>-	    i830_lvds_set_backlight(output, val);
>+	if (val != dev_priv->backlight_duty_cycle) {
>+	    dev_priv->set_backlight(output, val);
> 	    dev_priv->backlight_duty_cycle = val;
> 	}
> 	return TRUE;
>+    } else if (property == backlight_control_atom) {
>+	enum backlight_control val;
>+	Atom backlight_atom;
>+	int backlight_range[2], err, data;
>+
>+	if (value->type != XA_INTEGER || value->format != 32 ||
>+	    value->size != 1)
>+	    return FALSE;
>+
>+	val = *(enum backlight_control *)value->data;
>+	if (val < 0 || val > KERNEL)
>+	    return FALSE;
>+
>+	pI830->backlight_control_method = val;
>+	switch (pI830->backlight_control_method) {
>+	case NATIVE:
>+	    dev_priv->set_backlight = i830_lvds_set_backlight_native;
>+	    dev_priv->get_backlight = i830_lvds_get_backlight_native;
>+	    dev_priv->backlight_max =
>+		i830_lvds_get_backlight_max_native(output);
>+	    break;
>+	case LEGACY:
>+	    dev_priv->set_backlight = i830_lvds_set_backlight_legacy;
>+	    dev_priv->get_backlight = i830_lvds_get_backlight_legacy;
>+	    dev_priv->backlight_max = 0xff;
>+	    break;
>+	case COMBO:
>+	    dev_priv->set_backlight = i830_lvds_set_backlight_combo;
>+	    dev_priv->get_backlight = i830_lvds_get_backlight_combo;
>+	    dev_priv->backlight_max =
>+		i830_lvds_get_backlight_max_native(output);
>+	    break;
>+	case KERNEL:
>+	    dev_priv->set_backlight = i830_lvds_set_backlight_kernel;
>+	    dev_priv->get_backlight = i830_lvds_get_backlight_kernel;
>+	    dev_priv->backlight_max = 0;
>+	    break;
>+	default:
>+	    /* really shouldn't get here given the range check above */
>+	    break;
>+	}
>+
>+	/*
>+	 * Update the backlight atom since the range and value may have changed
>+	 */
>+	backlight_atom = MakeAtom(BACKLIGHT_NAME, sizeof(BACKLIGHT_NAME) - 1,
>+				  TRUE);
>+
>+	backlight_range[0] = 0;
>+	backlight_range[1] = dev_priv->backlight_max;
>+	err = RRConfigureOutputProperty(output->randr_output, backlight_atom,
>+					FALSE, TRUE, FALSE, 2, backlight_range);
>+	if (err != 0) {
>+	    xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
>+		       "RRConfigureOutputProperty error, %d\n", err);
>+	}
>+	/* Set the current value of the backlight property */
>+	data = dev_priv->get_backlight(output);
>+	err = RRChangeOutputProperty(output->randr_output, backlight_atom,
>+				     XA_INTEGER, 32, PropModeReplace, 1, &data,
>+				     FALSE, TRUE);
>+	if (err != 0) {
>+	    xf86DrvMsg(pScrn->scrnIndex, X_ERROR,
>+		       "RRChangeOutputProperty error, %d\n", err);
>+	}
>+	return TRUE;
>     }
> 
>     return TRUE;
>@@ -628,6 +929,35 @@ i830_lvds_init(ScrnInfoPtr pScrn)
> 	}
>     }
> 
>+    i830_set_lvds_backlight_method(output);
>+
>+    switch (pI830->backlight_control_method) {
>+    case NATIVE:
>+	dev_priv->set_backlight = i830_lvds_set_backlight_native;
>+	dev_priv->get_backlight = i830_lvds_get_backlight_native;
>+	dev_priv->backlight_max = i830_lvds_get_backlight_max_native(output);
>+	break;
>+    case LEGACY:
>+	dev_priv->set_backlight = i830_lvds_set_backlight_legacy;
>+	dev_priv->get_backlight = i830_lvds_get_backlight_legacy;
>+	dev_priv->backlight_max = 0xff;
>+	break;
>+    case COMBO:
>+	dev_priv->set_backlight = i830_lvds_set_backlight_combo;
>+	dev_priv->get_backlight = i830_lvds_get_backlight_combo;
>+	dev_priv->backlight_max = i830_lvds_get_backlight_max_native(output);
>+	break;
>+    case KERNEL:
>+	dev_priv->set_backlight = i830_lvds_set_backlight_kernel;
>+	dev_priv->get_backlight = i830_lvds_get_backlight_kernel;
>+	dev_priv->backlight_max = i830_lvds_get_backlight_max_kernel(output);
>+	break;
>+	break;
>+    default:
>+	xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "bad backlight control method\n");
>+	break;
>+    }
>+
>     return;
> 
> disable_exit:

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Attachments on bug 11527: 12001 | 12414 | 12431 | 12433

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