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

(In reply to Sylvain Pasche from comment #13)
> Hi Hans,
> 
> Thanks for your reply. Indeed, with the "video.use_native_backlight=1"
> kernel parameter, only the intel_backlight interface is available.
> 
> However, there is still the issue that after suspend+resume, there is no
> backlight (black screen), and I have to close and reopen the lid to turn it
> back on.
> 
> (the laptop dmi results are the same as
> https://bugzilla.redhat.com/attachment.cgi?id=923510)

Hmm, what does "ls /sys/class/backlight" give as output with the latest F-22
kernels without anything on the kernel commandline? And what are the problem
symptoms when not having anything on the kernel commandline ? Does brightness
control after boot work then? And what about after suspend/resume?

Can you also try booting without "video.use_native_backlight=1" and with:

acpi_osi="!Windows 2012"

on the kernel commandline?

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