Thanks for the testing result, there is a known deadlock in the upstream
kernel that I guess I should be fixing... As the default is for fbc=0 on
released kernels, enabling it is at your own risk - ergo not a bug in
Ubuntu per se.
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status:
Thanks for the suggestion - that seems to have fixed it.
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https://bugs.launchpad.net/bugs/1178706
Title:
System freeze after DPMS off with external
Try without i915.i915_enable_fbc=1 as it is disabled due to it being
buggy and can potentially deadlock the system... Which sounds like it
should explain your hang.
** Summary changed:
- Power Management causes system to be unusable
+ System freeze after DPMS off with external monitors
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