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[Wladimir Mutel <mwg@xxxxxxxxx>]

Public bug reported:

I am testing Wily on Kubuntu package set with SDDM display manager.
After upgrading Mesa packages from 10.6.3 to 11.0.0 I found that graphical logon screen does not appear, and the system freezes with black screen, non-blinking cursor and non-responding keyboard&touchpad
I disabled SDDM service in systemctl and could log in to text console. 
Then I found that 'startx' command freezes the system as well. 
In dpkg.log I found that Mesa packages were updated last, from v. 10.6.3 to 11.0.0. 
I downloaded older versions from Ubuntu pool mirror and installed them by dpkg -i.
After that, GUI operation was fixed, and I re-enabled SDDM and continue using my system without more significant problems.

My system is Acer 1830T, made in 2010, CPU is Core i3-380UM with
integrated GPU (Westmere/Ironlake/Arrandale, reported as gen5 in
Xorg.0.log).

Please investigate and fix this issue. Please ask me if you need more
testing or more details.

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

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https://bugs.launchpad.net/bugs/1499055

Title:
  Wily: Mesa 11.0 causes hang in Intel Xorg driver, reverting to 10.6.3
  fixes

Status in mesa package in Ubuntu:
  New

Bug description:
  I am testing Wily on Kubuntu package set with SDDM display manager.
  After upgrading Mesa packages from 10.6.3 to 11.0.0 I found that graphical logon screen does not appear, and the system freezes with black screen, non-blinking cursor and non-responding keyboard&touchpad
  I disabled SDDM service in systemctl and could log in to text console. 
  Then I found that 'startx' command freezes the system as well. 
  In dpkg.log I found that Mesa packages were updated last, from v. 10.6.3 to 11.0.0. 
  I downloaded older versions from Ubuntu pool mirror and installed them by dpkg -i.
  After that, GUI operation was fixed, and I re-enabled SDDM and continue using my system without more significant problems.

  My system is Acer 1830T, made in 2010, CPU is Core i3-380UM with
  integrated GPU (Westmere/Ironlake/Arrandale, reported as gen5 in
  Xorg.0.log).

  Please investigate and fix this issue. Please ask me if you need more
  testing or more details.

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