[Bug 77767] intel framebuffer broken by d978ef14456a38034f6c0e94a794129501f89200 in kernel 3.15-rc

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=77767

--- Comment #7 from Chris Wilson <chris at chris-wilson.co.uk> ---
diff --git a/drivers/gpu/drm/i915/intel_fbdev.c
b/drivers/gpu/drm/i915/intel_fbdev.c
index b16116db6c37..24463b643fc8 100644
--- a/drivers/gpu/drm/i915/intel_fbdev.c
+++ b/drivers/gpu/drm/i915/intel_fbdev.c
@@ -133,6 +133,12 @@ static int intelfb_create(struct drm_fb_helper *helper,

        mutex_lock(&dev->struct_mutex);

+       if (intel_fb &&
+           sizes->fb_width > intel_fb->base.width ||
+           sizes->fb_height > intel_fb->base.height) {
+               drm_framebuffer_reference(&ifbdev->fb->base);
+               intel_fb = NULL;
+       }
        if (!intel_fb || WARN_ON(!intel_fb->obj)) {
                DRM_DEBUG_KMS("no BIOS fb, allocating a new one\n");
                ret = intelfb_alloc(helper, sizes);

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