Backlight of laptop screen is off after suspend

[derwackreschwabe]

After upgrading to 8.04 today and to the new kernel 2.6.24,
my backlight is turned off after resuming from a suspend. I can see something, just the backlight is off.
Switching to a Console with CMD-ALT-F3 and back to X11 turns it on.

This problem is known with my laptop and I resolved it with gutsy adding DOUBLE_CONSOLE_SWITCH=true to /etc/default/acpi-support, but this does not to work for hardy.
Laptop: Lenovo Thinkpad T61 with Intel GMA915 graphics.

Please feel free to ask for some attachements or files or anything that helps.
Thanks for the good job youre doing.

[Flávio Etrusco (etrusco)]

Doesn't any other action (keyboard, mouse, touchpad) bring the screen on?

[fringd (fringd)]

this is happening for me with 12.04 on a new (2012) samsung series 9

i can log in blind, after which the brightness hotkeys will work and "wake up" the backlight.

[fringd (fringd)]

maybe a duplicate of #967161

[penalvch (penalvch)]

fringd / Jason Robinson, please do not mark this bug a duplicate of another or vice versa.

derwackreschwabe, this bug was reported a while ago and there hasn't been any activity in it recently. We were wondering if this is still an issue? If so, could you please test for this with the latest development release of Ubuntu? ISO images are available from http://cdimage.ubuntu.com/daily-live/current/ .

If it remains an issue, could you please run the following command in the development release from a Terminal (Applications->Accessories->Terminal), as it will automatically gather and attach updated debug information to this report:

apport-collect -p linux REPLACE-WITH-BUG-NUMBER

If reproducible, could you also please test the latest upstream kernel available (not the daily folder) following https://wiki.ubuntu.com/KernelMainlineBuilds ? It will allow additional upstream developers to examine the issue. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this bug is fixed in the mainline kernel, please add the following tags:
kernel-fixed-upstream
kernel-fixed-upstream-VERSION-NUMBER

where VERSION-NUMBER is the version number of the kernel you tested. For example:
kernel-fixed-upstream-3.14-rc2

This can be done by clicking on the yellow circle with a black pencil icon next to the word Tags located at the bottom of the bug description. As well, please remove the tag:
needs-upstream-testing

If the mainline kernel does not fix this bug, please add the following tags:
kernel-bug-exists-upstream
kernel-bug-exists-upstream-VERSION-NUMBER

As well, please remove the tag:
needs-upstream-testing

Once testing of the upstream kernel is complete, please mark this bug's Status as Confirmed. Please let us know your results. Thank you for your understanding.

[Launchpad Janitor (janitor)]

[Expired for linux (Ubuntu) because there has been no activity for 60 days.]