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[milegrin <milegrin@xxxxxxxxx>]

Confirmed bug on Lenovo E550.
Prominently appears when plugging in an external Samsung S23C350 screen before boot/power on however plugging it in once logged it.  Thus far the bug has only once occurred when the external screen is not plugged in.

https://bugs.launchpad.net/linux/+bug/1432194 :: bug #1432194 refers to
the same/similar issue.

The fix mentioned has not fixed my installation using xserver-xorg-
video-intel-lts-utopic ver 2.99.914-1 (Comment #8 mentions that fix is
not for utopic - possibly why the fix did not work)


<code>
root@u1404:~/# uname -a
Linux u1404 3.16.0-34-generic #47~14.04.1-Ubuntu SMP Fri Apr 10 17:49:16 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
root@u1404:~/# lshw -c video
  *-display               
       description: VGA compatible controller
       product: Broadwell-U Integrated Graphics
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 09
       width: 64 bits
       clock: 33MHz
       capabilities: msi pm vga_controller bus_master cap_list rom
       configuration: driver=i915 latency=0
       resources: irq:63 memory:d0000000-d0ffffff memory:a0000000-bfffffff ioport:5000(size=64)
root@u1404:~/# modinfo i915 | head
filename:       /lib/modules/3.16.0-34-generic/kernel/drivers/gpu/drm/i915/i915.ko
license:        GPL and additional rights
description:    Intel Graphics
author:         Tungsten Graphics, Inc.
srcversion:     4623F6696D48BF78FB054D5
alias:          pci:v00008086d000022B3sv*sd*bc03sc*i*
alias:          pci:v00008086d000022B2sv*sd*bc03sc*i*
alias:          pci:v00008086d000022B1sv*sd*bc03sc*i*
alias:          pci:v00008086d000022B0sv*sd*bc03sc*i*
alias:          pci:v00008086d0000162Dsv*sd*bc03sc*i*
root@u1404:~/# lspci -nnk | grep '\[03' -A2
00:02.0 VGA compatible controller [0300]: Intel Corporation Broadwell-U Integrated Graphics [8086:1616] (rev 09)
	Subsystem: Lenovo Device [17aa:5021]
	Kernel driver in use: i915
--
05:00.0 Display controller [0380]: Advanced Micro Devices, Inc. [AMD/ATI] Opal XT [Radeon R7 M265] [1002:6604] (rev ff)
	Kernel driver in use: radeon
06:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5227 PCI Express Card Reader [10ec:5227] (rev 01)
root@u1404:~/# dpkg -l | grep -i video-intel
ii  xserver-xorg-video-intel-lts-utopic                   2:2.99.914-1~exp1ubuntu4.2~trusty1                  amd64        X.Org X server -- Intel i8xx, i9xx display driver
root@u1404:~/# 
</code>

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to xserver-xorg-video-intel in Ubuntu.
https://bugs.launchpad.net/bugs/1444436

Title:
  [BDW GT3] Backport fixes to unbreak X

Status in xserver-xorg-video-intel package in Ubuntu:
  Fix Released
Status in xserver-xorg-video-intel-lts-utopic package in Ubuntu:
  Invalid
Status in xserver-xorg-video-intel source package in Trusty:
  Fix Committed
Status in xserver-xorg-video-intel-lts-utopic source package in Trusty:
  New
Status in xserver-xorg-video-intel source package in Utopic:
  Confirmed

Bug description:
  BDW GT3 need these to properly render menus, windows:

  commit de54a93217cc550c44ee138f0511ede6925d84e0
  Author: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
  Date:   Wed Oct 22 19:30:21 2014 +0100

      sna/gen8: Annotate more 64bit pointer locations

  commit 7a9bdadd71730adc5266bc6758982abec5917b93
  Author: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
  Date:   Wed Oct 22 19:31:10 2014 +0100

      sna/gen8: Clamp URB allocations for GT3

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