[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 #12 from Hans de Goede <jwrdegoede at fedoraproject.org> ---
Hi Sylvain,

(In reply to Sylvain Pasche from comment #10)
> I'm still having the same issue with kernel 4.0 from Fedora 22
> (4.0.4-301.fc22.x86_64). It's a bit more annoying now because the xorg
> workaround doesn't work with Gnome 3.16
> (https://bugzilla.gnome.org/show_bug.cgi?id=747781).
> 
> Do you need more information for fixing this issue?

First of all make sure you are using Fedora 22 kernel version 4.0.2-300 or
newer and that you do NOT have any backlight related options like
"acpi_backlight=vendor" on your kernel commandline.

If things do not work with F-22 kernel >= 4.0.2-300 without any special kernel
commandline options, try
booting F-22 kernel >= 4.0.2-300 with "video.use_native_backlight=1" added to
the kernel commandline.

After booting with "video.use_native_backlight=1" please do:

ls /sys/class/backlight

You should then only see "intel_backlight" there, if this fixes things please
run the following from a terminal:

grep '.*' /sys/class/dmi/id/*_* 2> /dev/null > dmi.log

And copy and paste the output here so that a quirk for your model can be added
to the kernel.

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