[Bug 82634] [snb] backlight issue on TOSHIBA PORTEGE R830 after suspend/resume

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=82634

--- Comment #20 from Sylvain Pasche <sylvain.pasche at gmail.com> ---
(In reply to Hans de Goede from comment #16)
[...]
> Please install this kernel and then boot into it with:
> "i915.enable_backlight_control=0" (and no other backlight related options) 
> added to the kernel commandline, then do:
> 
> ls /sys/class/backlight
> 
> And you should only see acpi_video0 there, then try if backlight control
> works, then suspend/resume and check if backlight control still works.

Hi Hans,

I really appreciate your effort in trying to find a solution for this.
Unfortunately, the situation with the patch is not very promising :-(

After booting with that kernel + commandline option, I see only the acpi_video0
driver indeed. However, changing the brightness has no effect (the actual
screen brightness doesn't change).

After suspend / resume, the backlight is off. And closing / reopening the lid
doesn't bring it back on.

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