[Bug 79146] i3-3227U's HD4000 fails to work

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79146

--- Comment #6 from Shen Li <etkids at 163.com> ---
(In reply to comment #5)
> If you drop all the extra kernel/module parameters, incl. nomodeset, what do
> you have in /sys/class/backlight? Can you enable backlight by echoing the
> value in max_brightness to brightness? Is the backlight the only thing that
> fails?

well, without nomodeset I can see nothing but a grey screen, the backlight of 
which can be adjusted.
However, with nomodeset, I can't adjust the backlight

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