[Quantal][SRU] Updated i915 driver for HSW support

Anca Emanuel anca.emanuel at gmail.com
Mon Dec 3 13:14:29 UTC 2012

VGA fixes here:

On Sat, Dec 1, 2012 at 9:13 AM, Leann Ogasawara
<leann.ogasawara at canonical.com> wrote:
> BugLink: http://bugs.launchpad.net/bugs/1085245
> == Quantal SRU Justification ==
> Beginning with the 12.04.2 point release, we are providing the 12.10
> kernel as an enablement vehicle.  Enablement for Haswell graphics has
> been a frequent request and highly sought after for the 12.04.2 point
> release coupled with the 12.10 kernel and X stack.  Full enablement
> support for Haswell will unfortunately not be available by default until
> the upstream v3.8 kernel.  Given our release time frames, waiting for
> the v3.8 kernel to land in an official Ubuntu release and propagate back
> into 12.04 will greatly delay our ability to support Haswell in the near
> future.  As an alternative solution, I'm am proposing we provide an
> updated i915 driver in Quantal with Haswell support.
> == Fix ==
> We can provide an updated snapshot of the i915 driver which supports
> Haswell.  This updated snapshot is also making it's way through the
> drm-intel tree and targeting to land in the upstream v3.8 kernel.  This
> updated version of the i915 driver being proposed here for the Quantal
> kernel will only support Haswell pci id's which should greatly reduce
> the risk of regression to non-Haswell hardware.  The following set of
> patches introduces this updated i915 driver as an Ubuntu driver (ie
> ubuntu-quantal/ubuntu/i915) and will be renamed to "i915_hsw".
> The updated i915 snapshot was taken from
> "git://people.freedesktop.org/~danvet/drm backport-3.6" which was
> specifically provided by Intel to help with backporting efforts.  It is
> a v3.6 based tree with primarily Haswell enablement patches applied on
> top.  It should be less volatile than a drm-intel-nightly branch which
> contains the same Haswell support.  The set of patches I'm proposing for
> the Quantal kernel can be reviewed at:
>   git://kernel.ubuntu.com/ogasawara/ubuntu-quantal.git hsw-backport-3.6
> I would note I did have to include some patches which touch outside the
> ubuntu/i915 space.  However, I hope most are straightforward enough to
> see they pose no risk of regression (ie they only introduce new
> #define's or functions which are only used by this newer driver).  I
> would also note I did need to also cherry-pick some drm/fb-helper
> patches which were listed in the backport-3.6 branch from Intel in order
> to resolve some VGA issues I was seeing while testing.  I hope those are
> also straightforward when reviewing.
> == Testing ==
> I've tested this on a Beta Shark Bay Desktop SDP replicating the same
> package combination we'll see with the 12.04.2 point release, ie Precise
> + Quantal X stack + Quantal test kernel.  I see significant improvements
> compared to a stock Quantal kernel.  With a stock Quantal kernel, the
> system is unusable and the monitor powers off 3secs into booting
> anyways.  With the proposed set of patches I'm able to successfully boot
> and connect a monitor over HDMI and VGA.  I also did some general smoke
> testing of suspend/resume, audio, ethernet, wifi, reboot/shutdown, 3D,
> and monitor hotplugging all of which passed with the exception of
> suspend/resume failures over VGA which I'm told is a known issue that is
> being addressed.  I have also tested this on all my non-Haswell hardware
> and can confirm I see no regressions.
> Given this set of patches should be well contained and really only
> affect Haswell hardware, I propose we try and pull it in for the
> upcoming Quantal kernel SRU cycle.  It will allow us to ensure we see no
> regressions on non-Haswell hardware but also allow us to start more
> widespread testing against the Haswell hardware we do have access to.
> Thanks,
> Leann
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