Set video brightness to max if it is 0 on bootup.

[James M. Leddy]

Some machines initialize their screen brightness to zero, which means for users it is very dark when you first boot your machine. This is annoying because you have to adjust brightness every time you boot up.

This patch proposes that we set the brightness to half the maximum value if this happens:

https://patchwork.kernel.org/patch/1529521/

[Brad Figg (brad-figg)]

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 1118710

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Alex Hung (alexhung)]

@James,

ACPI video.c module has a new function (i.e. video_ignore_initial_backlight) that will ignore BIOS initial zero brightness; however, DMI information is needed for the quirk.

Can you please run "sudo dmidecode > dmi.log" and attach the output? Let's see if we can add entries for the system(s).

[Alex Hung (alexhung)]

Upstream has different patches for the same problem, and quirks are used as the following commits for 12.04:

lts-backport-quantal: b53729e72e31a7f8ecb5b025f5799f4f363dc757
precise: 95fbf65ed2ed69e5ee6ff0cf4c944091687673a0

As a result, it seems to add DMI to "video_dmi_table" and calls video_ignore_initial_backlight (as in #2). Therefore, we will need to find out which systems has the zero-brightness problem and add their DMI one by one.

[Anthony Wong (anthonywong)]

@alexhung
Please refer to bug 1045208 for what machines are affected.

[Anthony Wong (anthonywong)]

@alex
are you able to find the necessary DMI data?

[Alex Hung (alexhung)]

Two are identified and fixed. I was not able to find others, if any.

https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1167760
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1184501

[Alex Hung (alexhung)]

I don't think there are others at the moment, as it does not specify exact models. Let's close this bug and file others if we encounter failures on other specified systems.

[Joseph Salisbury (jsalisbury)]

This bug was nominated against a series that is no longer supported, ie quantal. The bug task representing the quantal nomination is being closed as Won't Fix.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Steve Langasek (vorlon)]

The Precise Pangolin has reached end of life, so this bug will not be fixed for that release