Public bug reported:
Older Dell Latitude C600 upgraded from 8.10 to 9.04, LCD backlight now
remains on in S3 suspend. Specifically, suspend/resume overall works as
expected, the panel is shut off, but the backlight remains lit (even
with the lid closed). Reproducible every time, and a clear regression
from 8.10 and earlier. Normal DPMS functionality and 'xset dpms force
off' work as expected, though in either case, the backlight and panel
will be powered back on during the suspend process, thus the only
available workaround for this is to avoid suspend and power the machine
off.
The device identifies itself as 'ATI Technologies Inc Rage Mobility M3
AGP 2x (rev 02)', Xorg uses the R128 driver for this chip. There are no
unusual messages in dmesg or the Xorg log and no other functionality
seems to be affected. Oddly enough, the backlight will actually shut
off momentarily on a resume, and is then powered back on just prior to
the mode switch back to X.
** Affects: ubuntu
Importance: Undecided
Status: New
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Dell Latitude C600 backlight remains on in S3 suspend
https://bugs.launchpad.net/bugs/370617
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