** Also affects: xserver-xorg-video-intel (Ubuntu)
Importance: Undecided
Status: New
** Also affects: mesa (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1085245
Title:
[Quantal] Include support for Haswell hardware
Status in “linux” package in Ubuntu:
Invalid
Status in “mesa” package in Ubuntu:
New
Status in “xserver-xorg-video-intel” package in Ubuntu:
New
Status in “linux” source package in Quantal:
Fix Released
Status in “mesa” source package in Quantal:
New
Status in “xserver-xorg-video-intel” source package in Quantal:
New
Bug description:
== 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
and is currently making it's way through the drm-intel tree and targeted to
land in the upstream v3.8. 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 only the 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 backport 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 I have and can confirm I see no regressions.
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