Changing Brightness on Acer Aspire Timeline causes stalls

[Jorge]

Ubuntu 9.04 last update available on Acer Aspire 5810T, Solo 1.4GHz, Intel graphics, bios version 2.32 (flashed precisely to get Fn-bright keys to work).
After pressing Fn-bright (up or down), the Brightness actions get done, OS carries on but "stalling". Stalling means a cycle where it's 5secs idle and unresponsive (nothing gets done, keystrokes produce nothing), 1 sec working.
Hard disks are idle, and monitoring process usage is all 0%.

If I logout, it returns to log in screen, if I re-log in, everything is OK. So, I'm guessing the X session went bad... after restart, were ok again.

[Jorge (jorge-pinto-clix)]

bios version is actually 2.31.
Brightness applet does nothing.
If I press Fn-bright up or down at log in screen, the stalling begins, and we're back to normal after log-in succeeds.
Also, were can I set the default (log in) brightness? Gconf-editor settings are being ignored completely.

[Victor Vargas (kamus)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This bug did not have a package associated with it, which is important for ensuring that it gets looked at by the proper developers. You can learn more about finding the right package at https://wiki.ubuntu.com/Bugs/FindRightPackage , so I have classified this bug as a bug in linux package. Additionally, if is possible, can you try to reproduce this issue in latest ubuntu Karmic version?

[Jorge (jorge-pinto-clix)]

kernel version 2.6.28-7 generic
would you guys tell me what other packages would be of interest?

I'm not ready for karmic koala, since I've seen to many open bugs on this HW. Sorry about the delay, but power-management issues (this computer does 8h45m on vista and 3h40m in 9.04... after days of useless tweaking) and not being able to mount CD/DVD renders ubuntu unusable for me right now... but I'm glad to help in whatever possible.

[Jorge (jorge-pinto-clix)]

Just upgraded to 9.10, and its worse: when I hit Fn+brightness, system stops responding completely.

[executorvs (executorvs)]

I have this bug as well. attempting to use the brightness key on my Acer 5810TZ induces complete system lockup.
similar bugs for other acer users are listed bellow.
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/446717
https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/432835
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/397617

I do not know if the first two have any relation to the KMS bug as some of the work arounds people listed for their hardware did not work on mine.