Hi there, I finally managed to do a bisect on this. It took a while
because the good and bad kernels were in non-linear branches so I had to
do 14 kernel builds on my ancient laptop!

This is the end of the trail:

$ git bisect bad
24576d23976746cb52e7700c4cadbf4bc1bc3472 is the first bad commit
commit 24576d23976746cb52e7700c4cadbf4bc1bc3472
Author: Jesse Barnes <jbar...@virtuousgeek.org>
Date:   Tue Mar 26 09:25:45 2013 -0700

    drm/i915: enable VT switchless resume v3
    
    With the other bits in place, we can do this safely.
    
    v2: disable backlight on suspend to prevent premature enablement on resume
    v3: disable CRTCs on suspend to allow RTD3 (Kristen)
    
    Signed-off-by: Jesse Barnes <jbar...@virtuousgeek.org>
    Reviewed-by: Rodrigo Vivi <rodrigo.v...@gmail.com>
    Signed-off-by: Daniel Vetter <daniel.vet...@ffwll.ch>

:040000 040000 72fb279ebc4c48824015f43eac459d046dde3204
6797fd617ffd75b6e2a457aaabf5e90f9a4021c0 M      drivers

What do I do now?

Best wishes, Peter

** Changed in: linux (Ubuntu)
       Status: Expired => Incomplete

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https://bugs.launchpad.net/bugs/1272945

Title:
  8086:2592 [Toshiba Portégé R200-110] Black screen/freeze after resume
  with i915

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