Hm, ok. The driver backs off because the generic acpi backlight driver is
there. Question: under /proc/acpi/video, is there an LCD device with supported
backlight control. What happens when writing values there directly? (also post
"grep -r . /proc/acpi/video" for reference).
If control there does not work, what happens when using "acpi_backlight=vendor"
on the grub line?
** Changed in: linux (Ubuntu)
Assignee: Canonical Kernel Team (canonical-kernel-team) => Stefan Bader
(stefan-bader-canonical)
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[Jaunty] Brightness buttons don't work on Sony VGN-Z540
https://bugs.launchpad.net/bugs/361781
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