Compaq Presario C700 Series (C756A) brightness controls do not function.

[Kevin]

Compaq Presario C756CA laptop (from the C700 series) -- LCD Brightness controls (brighter/dimmer) keys do not function.
See attached HAL dump.

in Ubuntu Hardy (8.04) -- Kernel -- Linux 2.6.24-17-generic #1 SMP Thu May 1 14:31:33 UTC 2008 i686 GNU/Linux

[Kevin (linuxbugs-swiftninja)]

Bug description title reads c756a -- Should read C756CA. Apologies for the typo.

[Marlon Cisternas Milla (mcisternas-deactivatedaccount)]

Hi all,

I have this problem in my Compaq Presario C708LA with Ubuntu Hardy, But two months ago in my Gutsy Ubuntu this problem not exist and these controls were working .

Kernel -- Linux 2.6.24-17-generic #1 SMP Thu May 1 14:31:33 UTC 2008 i386 GNU/Linux.

[Anant Khaitan (anantkhaitan)]

I am having similar problem on my Compaq Presario C773TU Notebook with Ubuntu 8.04, and the Brightness applet is also not working rather showing a cross sign on it.

[Marlon Cisternas Milla (mcisternas-deactivatedaccount)]

Now, I confirm this problem in Hardy 8.04.1 in my Compaq Presario C708LA.

There is some solution for this?

[Daniel T Chen (crimsun)]

Is this symptom reproducible in 9.04 alpha 3 (vm or desktop/live cd will suffice)?

[xteejx (xteejx)]

We are closing this bug report because it lacks the information we need to investigate the problem, as described in the previous comments. Please reopen it if you can give us the missing information, and don't hesitate to submit bug reports in the future. To reopen the bug report you can click on the current status, under the Status column, and change the Status back to "New". Thanks again!

[Ryan C. Underwood (nemesis-icequake)]

Upstream ACPI bug. This laptop needs a WMI driver for the hotkeys and proper ACPI operation.

http://bugzilla.kernel.org/show_bug.cgi?id=15066

[xteejx (xteejx)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. We are sorry that we do not always have the capacity to look at all reported bugs in a timely manner.
There have been many changes in Ubuntu since that time you reported the bug and your problem may have been fixed with some of the updates. It would help us a lot if you could test the current Ubuntu version (10.10). If you can test it, and it is still an issue, we would appreciate if you could upload updated logs by running apport-collect <bug #>, and any other logs that are relevant for this particular issue.

[Po-Hsu Lin (cypressyew)]

Closing this bug with Won't fix as Hardy is no longer supported.
Please feel free to open a new bug report if you're still experiencing this on a newer release (Bionic 18.04.3 / Disco 19.04)
Thanks!