Martin: The instructions you linked to work without the HCI_BACKLIGHT
patch to the kernel? Interesting. Have you tried it without passing
acpi_backlight=vendor to see if the acpi backlight works as well? What
about writing values other than 7?

The way that toshiba_acpi currently handles the backlight ends up with
something virtually identical to what the bios is doing when the
backlight is changed via the acpi_video backlight interface, at least on
the Tecra R840. So it would be interesting to try doing the same thing
with the script, but using the acpi_video0 backlight instead.

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https://bugs.launchpad.net/bugs/935778

Title:
  Various Toshiba laptops - brightness controls work on first boot, but
  do nothing after suspend/resume to RAM.

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