Please attach your dmesg, Xorg.0.log and anything leading upto the hang.
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/992235
Title:
Intel graphics hang in portrait mode
Status in “xserver-xorg-video-intel” package in Ubuntu:
Incomplete
Bug description:
Dell Optiplex 790 (Intel Q65 chipset/integraged graphics.) Using the
systems VGA and DVI for separate monitors. When any display is
configured with left or right 90 degree rotation, the system locks.
Lock also occurs if I place the VGA monitor to the right of the DVI
monitor. Have also reproduced with a live USB boot.
$ lsb_release -rd
Description: Ubuntu 12.04 LTS
Release: 12.04
$ sudo lshw -C display
*-display
description: VGA compatible controller
product: 2nd Generation Core Processor Family Integrated Graphics
Controller
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:45 memory:e0c00000-e0ffffff memory:d0000000-dfffffff
ioport:4000(size=64)
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