linux-kernel - Re: Revert a bunch of patches in stable kernels

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Date:	Mon, 18 Mar 2013 16:40:20 +0100
From:	Daniel Vetter <daniel.vetter@...ll.ch>
To:	stable <stable@...r.kernel.org>,
	Greg KH <gregkh@...uxfoundation.org>
Cc:	dri-devel <dri-devel@...ts.freedesktop.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	intel-gfx <intel-gfx@...ts.freedesktop.org>,
	Dave Airlie <airlied@...il.com>
Subject: Re: Revert a bunch of patches in stable kernels

On Mon, Mar 18, 2013 at 11:05 AM, Daniel Vetter <daniel.vetter@...ll.ch> wrote:
> Hi Greg&all,
>
> So a recent stable backport to fix rc6 on ilk (which is disabled by
> default and with dubious power savings at best, unlike rc6 on snb and
> later) totally blew up all over the place:
> https://bugzilla.kernel.org/show_bug.cgi?id=55291
> https://lkml.org/lkml/2013/3/14/540

This likely also is the culprit behind the ghost vga issues reported
on gm45, e.g:

https://bugzilla.redhat.com/show_bug.cgi?id=922304

Again, fixed in 3.9-rc kernels by

commit 20afbda209d708be66944907966486d0c1331cb8
Author: Daniel Vetter <daniel.vetter@...ll.ch>
Date:   Tue Dec 11 14:05:07 2012 +0100

    drm/i915: Fixup hpd irq register setup ordering

Cheers, Daniel

> There might be more, I'm still recovering from mail floods due to
> traveling last week. I think the right course of action is to revert
> the offending patch (plus anything depending upon it) and give up on
> rc6 on ilk in 3.8 - too messy. All bug reports confirmed that 3.9-rc
> kernels work as expected. Upstream commits to revert:
>
> 15239099d7a7a9ecdc1ccb5b187ae4cda5488ff9 drm/i915: enable irqs earlier
> when resuming
> 52d7ecedac3f96fb562cb482c139015372728638 drm/i915: reorder setup
> sequence to have irqs for output setup
>
> Cheers, Daniel
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> +41 (0) 79 365 57 48 - http://blog.ffwll.ch



-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch
--
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