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Diffstat (limited to 'kernel/drivers/gpu/drm/i915/intel_panel.c')
-rw-r--r-- | kernel/drivers/gpu/drm/i915/intel_panel.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/kernel/drivers/gpu/drm/i915/intel_panel.c b/kernel/drivers/gpu/drm/i915/intel_panel.c index 08532d4ff..2bf92cba4 100644 --- a/kernel/drivers/gpu/drm/i915/intel_panel.c +++ b/kernel/drivers/gpu/drm/i915/intel_panel.c @@ -879,6 +879,14 @@ static void i9xx_enable_backlight(struct intel_connector *connector) /* XXX: combine this into above write? */ intel_panel_actually_set_backlight(connector, panel->backlight.level); + + /* + * Needed to enable backlight on some 855gm models. BLC_HIST_CTL is + * 855gm only, but checking for gen2 is safe, as 855gm is the only gen2 + * that has backlight. + */ + if (IS_GEN2(dev)) + I915_WRITE(BLC_HIST_CTL, BLM_HISTOGRAM_ENABLE); } static void i965_enable_backlight(struct intel_connector *connector) |