linux-kernel - Re: [PATCH] Revert "drm/i915: fix vblank wait test condition"

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Message-Id: <89k83a$9hv9li@azsmga001.ch.intel.com>
Date:	Sat, 04 Sep 2010 10:21:07 +0100
From:	Chris Wilson <chris@...is-wilson.co.uk>
To:	Pekka Enberg <penberg@...nel.org>, torvalds@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, Pekka Enberg <penberg@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Sitsofe Wheeler <sitsofe@...oo.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: Re: [PATCH] Revert "drm/i915: fix vblank wait test condition"

On Sat,  4 Sep 2010 11:17:14 +0300, Pekka Enberg <penberg@...nel.org> wrote:
> This reverts commit 9559fcdbff4f93d29af04478bbc48294519424f5. The commit causes
> wrong screen resolution on some i915 machines such as MacBook which is a
> regression from 2.6.35. The issue has been reported multiple times but no fix
> has emerged:

NAK. You can't simply hide one bug by introducing a much bigger one.

As you have an affected machine, find which wait_for_vblank() needs to be
replaced with a msleep(20|50).

-- 
Chris Wilson, Intel Open Source Technology Centre
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