[SKL] starting xterm crashes the xserver

[Timo Aaltonen]

It was observed that starting certain apps (xterm, amdcccle) crash the xserver on Skylake. Rough bisect showed that 4.1-rc6 was ok while rc5 wasn't, and git bisect found the fixing commit:

commit 061cc3ab4c7b8ed235466134a00b9531766f6c1a
Author: Ingo Molnar <email address hidden>
Date: Wed May 20 11:45:30 2015 +0200

    x86/fpu: Disable XSAVES* support for now

while it's also cc'd to stable@, it's needed in the vivid kernel now to make the (backport) kernel deadline for 14.04.3.

[Brad Figg (brad-figg)]

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 1468797

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Brad Figg (brad-figg)]

This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed-vivid' to 'verification-done-vivid'.

If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed.

See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you!

[Timo Aaltonen (tjaalton)]

indeed doesn't crash anymore, verified

[Launchpad Janitor (janitor)]

This bug was fixed in the package linux - 3.19.0-23.24

---------------
linux (3.19.0-23.24) vivid; urgency=low

  [ Luis Henriques ]

  * Release Tracking Bug
    - LP: #1472346

  [ Chris J Arges ]

  * SAUCE: Don't use atomic read in evlist.c
    - LP: #1410673

linux (3.19.0-23.23) vivid; urgency=low

  [ Brad Figg ]

  * Release Tracking Bug
    - LP: #1472048

  [ Chris J Arges ]

  * [Config] Add CRYPTO_DEV_NX_*, 842_* as modules
    - LP: #1454687

  [ Lu, Han ]

  * SAUCE: i915_bpo: drm/i915/audio: add codec wakeup override
    enabled/disable callback
    - LP: #1460674

  [ Timo Aaltonen ]

  * SAUCE: Backport I915_OVERLAY_DISABLE_DEST_COLORKEY
    - LP: #1460674
  * SAUCE: i915_bpo: Rebase to drm-intel-next-fixes-2015-05-29
    - LP: #1460674
  * SAUCE: i915_bpo: Revert "drm/i915: Implement the intel_dp_autotest_edid
    function for DP EDID complaince tests"
    - LP: #1460674
  * SAUCE: i915_bpo: Revert "drm/i915: Add debugfs test control files for
    Displayport compliance testing"
    - LP: #1460674
  * SAUCE: Load i915_bpo from the hda driver on SKL/CHV
    - LP: #1460674
  * SAUCE: i915_bpo: Don't try to support BXT
    - LP: #1460674
  * SAUCE: i915_bpo: drm/i915/skl: Fix DMC API version.

  [ Upstream Kernel Changes ]

  * Revert "usb: dwc2: add bus suspend/resume for dwc2"
    - LP: #1471252
  * Revert "HID: logitech-hidpp: support combo keyboard touchpad TK820"
    - LP: #1471252
  * Revert "KVM: x86: drop fpu_activate hook"
    - LP: #1471252
  * Revert "libceph: clear r_req_lru_item in __unregister_linger_request()"
    - LP: #1471252
  * drm/i915: add component support
    - LP: #1460661
  * ALSA: hda: export struct hda_intel
    - LP: #1460661
  * ALSA: hda: pass intel_hda to all i915 interface functions
    - LP: #1460661
  * ALSA: hda: add component support
    - LP: #1460661
  * drm/atomic-helpers: Fix documentation typos and wrong copy&paste
    - LP: #1460674
  * drm/atomic: Rename drm_atomic_helper_commit_pre_planes() state argument
    - LP: #1460674
  * drm/atomic-helper: Rename commmit_post/pre_planes
    - LP: #1460674
  * drm/atomic-helpers: make mode_set hooks optional
    - LP: #1460674
  * drm/atomic-helper: Fix kerneldoc for prepare_planes
    - LP: #1460674
  * drm: Complete moving rotation property to core
    - LP: #1460674
  * drm: Share plane pixel format check code between legacy and atomic
    - LP: #1460674
  * drm/atomic: Constify a bunch of functions pointer structs
    - LP: #1460674
  * drm: Fix some typo mistake of the annotations
    - LP: #1460674
  * drm: change connector to tmp_connector
    - LP: #1460674
  * drm: atomic: Expose CRTC active property
    - LP: #1460674
  * drm: atomic: Allow setting CRTC active property
    - LP: #1460674
  * drm/atomic-helpers: Properly avoid full modeset dance
    - LP: #1460674
  * drm/atomic: Add helpers for state-subclassing drivers
    - LP: #1460674
  * drm: Fix some typos
    - LP: #1460674
  * drm/atomic: Add for_each_{connector,crtc,plane}_in_state helper macros
    - LP: #1460674
  * drm/atomic-helper: Don't call atomic_update_plane when it stays off
    - LP: #1460674
  * drm/atomic-helper: Really recover pre-atomic plane/cursor behavior
 ...

[Timo Aaltonen (tjaalton)]

surely fixed by now elsewhere