Discovered that correct behavior occurs when using 'pm-suspend --quirk- dpms-suspend', and also that 'radeontool light off' has no effect. Not sure whether that did under 8.10 or earlier, but the only listed quirk in /usr/share/hal/fdi/information/10freedesktop/20-video-quirk-pm- dell.fdi for the C600 is 'radeon_off' (which has not changed since prior releases). Adding 'dpms_suspend' restores correct backlight behavior, patch attached. Also verified that removing the 'radeon_off' quirk has no noticable effect.
Still unsure what caused the regression, although my current suspicion is that something (kernel?) broke whatever magic is behind the 'radeon_off' quirk. Will post findings to upstream mailing list and see what happens. ** Attachment added: "enable dpms_suspend quirk for Dell C600" http://launchpadlibrarian.net/26270488/hal-info-dell-C600-backlight-quirk.patch ** Package changed: ubuntu => hal-info (Ubuntu) -- Dell Latitude C600 backlight remains on in S3 suspend https://bugs.launchpad.net/bugs/370617 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
