[Bug 71391] GM45: Regression due to incorrect graphics base of stolen memory.

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=71391

--- Comment #8 from Chris Wilson <chris at chris-wilson.co.uk> ---
So to confirm it is the use of stolen that causes the upset (rather than some
random interaction with us reserving stolen), please try:

diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c
b/drivers/gpu/drm/i915/i915_gem_stolen.c
index d58b4e287e32..db0a75930ca4 100644
--- a/drivers/gpu/drm/i915/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
@@ -214,6 +214,8 @@ int i915_gem_init_stolen(struct drm_device *dev)
        struct drm_i915_private *dev_priv = dev->dev_private;
        int bios_reserved = 0;

+       return 0;
+
        if (dev_priv->gtt.stolen_size == 0)
                return 0;


Afaik, the only use-case for stolen on your machine is the fbcon framebuffer
and ringbuffers.

Can you please grab a video of the failure mode?

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