@kernel team, upstream suggests this patch:
commit 14667a4bde4361b7ac420d68a2e9e9b9b2df5231
Author: Chris Wilson <[email protected]>
Date: Tue Apr 3 17:58:35 2012 +0100
drm/i915: Finish any pending operations on the framebuffer before
disabling
Similar to the case where we are changing from one framebuffer to
another, we need to be sure that there are no pending WAIT_FOR_EVENTs on
the pipe for the current framebuffer before switching. If we disable the
pipe, and then try to execute a WAIT_FOR_EVENT it will block
indefinitely and cause a GPU hang.
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https://bugs.launchpad.net/bugs/982251
Title:
[gm45] False GPU lockup render.IPEHR: 0x01820000
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