kernel-packages team mailing list archive

[Janne Heikkinen <janne.m.heikkinen@xxxxxxxxx>]

Public bug reported:

Kernels since 4.2-rc1 contain:

[8fb55197e64d5988ec57b54e973daeea72c3f2ff] drm/i915: Agressive
downclocking on Baytrail

which causes hangs on my Bay Trail based Asus X553MA and likely on other Bay Trail based machines
as well. The hangs occur between minutes and hours after booting and there is no information found
related to them in kernel message buffer.

I found the above commit by doing bisection between 4.1.0 and 4.2-rc1 and reported it to intel-gfx
mailing list:

http://lists.freedesktop.org/archives/intel-gfx/2016-January/084203.html

I tested that these hangs occur with 14.04 LTS using latest linux-generic-lts-wily (4.2.0-23-generic) kernel
exactly as with any kernel beginning from 4.2-rc1 up to 4.4-rc8.

I'm now writing this bug report running 4.4-rc8 with patches from the above commit removed because
4.2.0-23-generic just hanged while I was trying to send report.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1531865

Title:
  4.2 (linux-generic-ltw-wily) kernel hangs on Bay Trail based Asus
  X553MA

Status in linux package in Ubuntu:
  New

Bug description:
  Kernels since 4.2-rc1 contain:

  [8fb55197e64d5988ec57b54e973daeea72c3f2ff] drm/i915: Agressive
  downclocking on Baytrail

  which causes hangs on my Bay Trail based Asus X553MA and likely on other Bay Trail based machines
  as well. The hangs occur between minutes and hours after booting and there is no information found
  related to them in kernel message buffer.

  I found the above commit by doing bisection between 4.1.0 and 4.2-rc1 and reported it to intel-gfx
  mailing list:

  http://lists.freedesktop.org/archives/intel-
  gfx/2016-January/084203.html

  I tested that these hangs occur with 14.04 LTS using latest linux-generic-lts-wily (4.2.0-23-generic) kernel
  exactly as with any kernel beginning from 4.2-rc1 up to 4.4-rc8.

  I'm now writing this bug report running 4.4-rc8 with patches from the above commit removed because
  4.2.0-23-generic just hanged while I was trying to send report.

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