[Bug 1031784] [NEW] Artifacts on screen with ivy bridge

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Timo Aaltonen (tjaalton):

[IMPACT]

renders IVB GT1 systems basically inoperable, with massive distortion on
screen

[TESTCASE]

boot 12.04 on a IVB GT1 (HD2500) system

[Regression Potential]

None, the changes are oneliners to reduce the max thread count on IVB
GT1, which matches the current (internal?) intel specs

--

I have a Intel 3570 CPU (Ivy Bridge) with built in 2500 graphics [1].
There is a lot of artifacts on screen, both in lightdm and in unity. There more or less impossibly to read any text on screen.
I have tested quantal and the packages from ppa:xorg-edgers/ppa without any improvement. I had high hopes what xf86-video-intel 2.20.2 was the solution because it contains ivy bridge fixes, but still no result. [2]

Note (link 2):
"For the last 9 months, since 2.16.901, we have been shipping a driver that
does not work on IvyBridge GT1 systems (HD2500 graphics); we were telling
the GPU to use an invalid number of threads for the pixel shader and this
in turned caused the GPU to hang."

With a plain install of precise I only see artifacts, but X hangs (hard)
when I'm using quantal or the packages from ppa:xorg-edgers/ppa

My current ugly workaround is to remove the intel driver and let X fall
back to something else, not a perfect solution but the system is usable.

[1] http://ark.intel.com/products/65702/Intel-Core-i5-3570-Processor-%286M-Cache-3_40-GHz%29
[2] http://lists.freedesktop.org/archives/xorg/2012-July/054947.html

Currently the system is running 12.04 with ppa ppa:xorg-edgers/ppa.
I have xserver-xorg-video-intel 2:2.20.2+git20120731.fd3a1236-0ubuntu0sarvatt~precise installed, the system hangs hard after I log in, or sometimes the GPU hangs and the screen goes to power save.

The system is not in use and I'm free to install and test whatever
version and/or packages you want me to install.

** Affects: xserver-xorg-video-intel
     Importance: Unknown
         Status: Unknown

** Affects: mesa (Ubuntu)
     Importance: Undecided
         Status: Fix Released

** Affects: xserver-xorg-video-intel (Ubuntu)
     Importance: High
     Assignee: Timo Aaltonen (tjaalton)
         Status: Fix Committed

** Affects: mesa (Ubuntu Precise)
     Importance: Undecided
         Status: New

** Affects: xserver-xorg-video-intel (Ubuntu Precise)
     Importance: High
         Status: In Progress


** Tags: blocks-hwcert-enablement
-- 
Artifacts on screen with ivy bridge
https://bugs.launchpad.net/bugs/1031784
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