This bug was fixed in the package linux - 3.5.0-15.23
---------------
linux (3.5.0-15.23) quantal; urgency=low
[ Upstream Kernel Changes ]
* Revert "drm/i915: don't forget the PCH backlight registers"
- LP: #1053269, #1055231, #1055665
* Revert "drm/i915: fix up PCH backlight #define mixup"
- LP: #1053269, #1055665
* Revert "drm/i915: allow pipe A for lvds on gen4"
- LP: #1053269, #1055665
* Revert "drm/i915: properly enable the blc controller on the right pipe"
- LP: #1053269, #1055665
* Revert "drm/i915: clear up backlight #define confusion on gen4+"
- LP: #1053269, #1055665
* Revert "drm/i915: pnv has a backlight polarity control bit, too"
- LP: #1053269, #1055665
-- Leann Ogasawara <leann.ogasaw...@canonical.com> Mon, 24 Sep 2012 12:33:26
-0700
** Changed in: linux (Ubuntu)
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/1053269
Title:
screen goes black after grub, lights up again when X starts
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