[Bug 72211] [HSW eDP] Response time larger than expected

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=72211

--- Comment #22 from Qingshuai Tian <qingshuai.tian at intel.com> ---
Created attachment 95008
  --> https://bugs.freedesktop.org/attachment.cgi?id=95008&action=edit
dmesg info of patched kernel with i915.fastboot=1 set

After applied patch in comment 21 to the latest nightly
kernel(0dfe3ce67bbd11c5b5e53250b0552ac2f36ac668), the responsiveness I get with
and without i915.fastboot=1 is as follows:

The reponsetime without i915.fastboot=1:
         Initcall time:   1199 msecs 
         Suspend time:  294 msecs  
         Resume time:  310 msecs

The reponsetime with i915.fastboot=1 set:
         Initcall time:   149 msecs 
         Suspend time:  264 msecs  
         Resume time:  310 msecs

But when I applied the patch and enable the fastboot, the eDP monitor was black
  without any outputs after machine boot up, while the backlight was turned on.
And after the system resume from s3, the eDP monitor returned to normal by
itself.

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