Public bug reported:
Hello-
toshiba portege r705
After boot, display backlight control works fine.
After suspend to ram (any number of times), backlight control does not work
After suspend to ram, wake, suspend to disk, wake backlight control returns to
working state.
When control is not working, on screen display does work -- indicating
backlight changing brightness (even though its not)
/proc/acpi/toshiba/lcd changes with button pushes, as expected
/sys/devices/platform/toshiba_acpi/backlight/toshiba/actual_brightness changes
with button pushes, as expected
however--
/sys/devices/platform/toshiba_acpi/backlight/toshiba/brightness never changes
from 0, even from a fresh boot.
Additionally, the max_brightness=7 and the count starts at 0, but there are
only 5 levels when adjusting using control buttons. And even more oddly, when
increasing from 0, display_brightness goes like this:
0,2,4,6,7
And when decreasing from 7, it goes like this:
7,5,3,1,0.
Although i think this needs to be filed against a different component,
(suggestions?) i thought it might be valid here as well.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
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toshiba_acpi no control of display backlight after suspend to ram
https://bugs.launchpad.net/bugs/606547
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