i915 backlight failure on resume with 2.6.27

Tue Dec 2 05:08:50 PST 2008

On Mon, 2008-12-01 at 11:42 -0600, James Bottomley wrote:
> You probably remember the system, it's my fujitsu P7120 lifebook with
> the funny backlight wiring.
> 
> Previously, suspend/resume was made to work by saving the PCI state
> including the legacy backlight register setting (and worked just fine
> when invoked with a hal quirk).
> 
> On FC9, with the 2.6.26 fedora kernels, hal no longer does anything and
> relies on the i915 kernel driver.  This was perfectly fine, except that
> the backlight was now being restored to full brightness on resume rather
> than the setting on resume.  The other annoyance was that VT consoles
> were now lost on resume (switching to them produces a black screen,
> although switching back to vt7 where X is running is fine).
> 
> As of the 2.6.27 fedora kernels, the backlight is now off on resume,
> which is even more annoying.  It can be turned on by doing a VT switch,
> although all the console VTs are still blank, so there looks to be some
> bug in the i915 driver that crept in between 2.6.26 and 2.6.27.

Hum as quick answer , kernel fedora 2.6.27 have change _DOS thing.
So may be that is the problem.
The fedora patch is talked about on lkml
http://lkml.org/lkml/2008/11/10/233

About this _DOS , I reported this problem a long time ago, which now
is on http://bugzilla.kernel.org/show_bug.cgi?id=6001

Regards,
-- 
Sérgio M. B.
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