Alex Barattini, thank you for performing the requested test. Would either of
the following kernel parameters used separately provide a WORKAROUND:
acpi_backlight=vendor
video.use_bios_initial_backlight=0
or the following in combination:
thinkpad-acpi.brightness_enable=1 acpi_backlight=vendor
** Tags removed: kernel-bug-exists-upstream-v3.13-rc3-trusty
** Tags added: kernel-bug-exists-upstream-v3.13-rc3
** Changed in: linux (Ubuntu)
Status: Confirmed => Incomplete
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https://bugs.launchpad.net/bugs/1261853
Title:
8086:0166 [Dell Inspiron 15R 5521] Impossible to adjust the screen
backlight
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