Public bug reported: We need a new patch from bdw-backports branch to fix a number of crashers in the i915_bdw driver:
commit 17ef4e5850c6fc48a3af2ca89aea19fec7298ace Author: Ben Widawsky <[email protected]> Date: Fri May 9 15:09:26 2014 -0700 drm/i915/bdw: Use MMIO for loading PDPs This is a partial-functional backport of: commit eeb9488e751a0a6401e7516a893efaf9d1f77fb5 Author: Ben Widawsky <[email protected]> Date: Fri Dec 6 14:11:10 2013 -0800 drm/i915: Extract mm switching to function In that commit, the new mm switching function introduced the ability to either load the page tables via the ring, or via MMIO. The issue we have is during reset, we do not have the ability to use the rings. Trying to do so will fail, and prevent our Aliasing PPGTT from coming back. In current upstream, we use the MMIO on reset, and LRI for everything else. Here however, we always use the MMIO (in spite of what docs say, I've used this for a long time, and it's never *not* worked.). During development, we were using MMIO, and it was changed toward the end on code review. We do not have enough of the other code in place to be as smart as we are for current upstream. Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=77587 Signed-off-by: Ben Widawsky <[email protected]> ** Affects: linux (Ubuntu) Importance: High Status: Fix Released ** Affects: linux (Ubuntu Trusty) Importance: High Assignee: Timo Aaltonen (tjaalton) Status: In Progress ** Changed in: linux (Ubuntu) Importance: Undecided => High ** Changed in: linux (Ubuntu) Status: New => In Progress ** Changed in: linux (Ubuntu) Assignee: (unassigned) => Timo Aaltonen (tjaalton) ** Also affects: linux (Ubuntu Trusty) Importance: Undecided Status: New ** Changed in: linux (Ubuntu Trusty) Importance: Undecided => High ** Changed in: linux (Ubuntu Trusty) Status: New => In Progress ** Changed in: linux (Ubuntu Trusty) Assignee: (unassigned) => Timo Aaltonen (tjaalton) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1319656 Title: [i915_bdw] Add a patch to fix crashes To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1319656/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
