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I'm running ubuntu on a Dell studio laptop with Intel® 965GM x86/MMX/SSE2 graphics. Most things work great, but every time I try to resume from  suspend the machine hangs. The screen simply stays black. I have to hold the power button to hard reset. The reboot then works ok. 
I seem to remember that the resume used to work under 12.04 but since I upgraded to more recent versions it stopped working. I most recently upgraded to 14.10 hoping the problem would go away with more recent versions, but no luck. I've searched around a lot, found a post that suggested that looking at file /var/log/Xorg.0.log.old might give useful information.
That file does indeed state a few things that seem relevant to me, such as:

...
[    33.637] (II) Loading /usr/lib/xorg/modules/libfbdevhw.so
[    33.638] (II) Module fbdevhw: vendor="X.Org Foundation"
[    33.638] 	compiled for 1.16.0, module version = 0.0.2
[    33.638] 	ABI class: X.Org Video Driver, version 18.0
[    33.638] (WW) Falling back to old probe method for vesa
[    35.971] (EE) intel(0): [drm] failed to set drm interface version: Permission denied [13].
[    35.971] (EE) intel(0): Failed to claim DRM device.
[    35.971] (II) UnloadModule: "intel"
[    35.971] (EE) Screen(s) found, but none have a usable configuration.
[    35.971] (EE) 
Fatal server error:
[    35.971] (EE) no screens found(EE) 
[    35.971] (EE) 
Please consult the The X.Org Foundation support 
	 at http://wiki.x.org
 for help. 
[    35.971] (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
[    35.971] (EE) 
[    36.014] (EE) Server terminated with error (1). Closing log file.


I guess if "drm failed" and as a result "no screen has a usable configuration" then that would explan why the screen simply stays black on resume, but I have no idea how to debug this further or how to fix it.
Any help / advice much appreciated.

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


** Tags: bot-comment resume suspend x.org
-- 
Resume from suspend fails
https://bugs.launchpad.net/bugs/1383780
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