Comments
Patch
@@ -1467,6 +1467,7 @@ static inline void intel_unregister_dsm_handler(void) { return; }
/* modesetting */
extern void intel_modeset_init_hw(struct drm_device *dev);
+extern void i915_redisable_vga(struct drm_device *dev);
extern void intel_modeset_init(struct drm_device *dev);
extern void intel_modeset_gem_init(struct drm_device *dev);
extern void intel_modeset_cleanup(struct drm_device *dev);
@@ -6964,6 +6964,23 @@ void intel_modeset_init_hw(struct drm_device *dev)
}
}
+void i915_redisable_vga(struct drm_device *dev)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ u32 vga_reg;
+
+ if (HAS_PCH_SPLIT(dev))
+ vga_reg = CPU_VGACNTRL;
+ else
+ vga_reg = VGACNTRL;
+
+ if (I915_READ(vga_reg) != VGA_DISP_DISABLE) {
+ DRM_DEBUG_KMS("Something enabled VGA plane, disabling it\n");
+ I915_WRITE(vga_reg, VGA_DISP_DISABLE);
+ POSTING_READ(vga_reg);
+ }
+}
+
void intel_modeset_init(struct drm_device *dev)
{
struct drm_i915_private *dev_priv = dev->dev_private;
@@ -541,6 +541,7 @@ static int intel_lid_notify(struct notifier_block *nb, unsigned long val,
mutex_lock(&dev->mode_config.mutex);
drm_helper_resume_force_mode(dev);
+ i915_redisable_vga(dev);
mutex_unlock(&dev->mode_config.mutex);
return NOTIFY_OK;
This is a note to let you know that I have just added a patch titled i915: ensure that VGA plane is disabled to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree which can be found at: http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue If you, or anyone else, feels it should not be added to this tree, please reply to this email. For more information about the 3.5.y.z tree, see https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable Thanks. -Herton ------ From 9f7eacda1ad86023a173104f93ea5d8ac7af7bf0 Mon Sep 17 00:00:00 2001 From: Krzysztof Mazur <krzysiek@podlesie.net> Date: Wed, 19 Dec 2012 11:03:41 +0100 Subject: [PATCH] i915: ensure that VGA plane is disabled commit 0fde901f1ddd2ce0e380a6444f1fb7ca555859e9 upstream. Some broken systems (like HP nc6120) in some cases, usually after LID close/open, enable VGA plane, making display unusable (black screen on LVDS, some strange mode on VGA output). We used to disable VGA plane only once at startup. Now we also check, if VGA plane is still disabled while changing mode, and fix that if something changed it. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=57434 Signed-off-by: Krzysztof Mazur <krzysiek@podlesie.net> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> [bwh: Backported to 3.2: intel_modeset_setup_hw_state() does not exist, so call i915_redisable_vga() directly from intel_lid_notify()] Signed-off-by: Ben Hutchings <ben@decadent.org.uk> [ herton: use version for 3.2 which is also valid for 3.5, only had to adjust context ] Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com> --- drivers/gpu/drm/i915/i915_drv.h | 1 + drivers/gpu/drm/i915/intel_display.c | 17 +++++++++++++++++ drivers/gpu/drm/i915/intel_lvds.c | 1 + 3 files changed, 19 insertions(+) -- 1.7.9.5