IBM X40 laptop lcd panel not recognized

Bug #162239 reported by jahok on 2007-11-12
Affects Status Importance Assigned to Milestone
linux (Ubuntu)

Bug Description

Lcd panel brightness adjustment doesn't exist on gnome power manager. I also couldn't find laptop panel from Hardware information. Function keys to adjust screen brightness do work. This applies to Ubuntu 7.10 x86.

On 7.04 the lcd panel is recognized and brightness adjustment does exit in power manager. I checked out this running livecd. I found modules ibm-acpi and backlight loaded (+many others), when on 7.10 only thinkpad-acpi is loaded. Module backlight doesn't seem to exist on 7.10. So this could possibly be a kernel issue.

Michael Nagel (nailor) wrote :

is this still an issue with intrepid?

Changed in linux:
status: New → Incomplete
jahok (puikku) wrote :

I only tested interpid from livecd running on AC power. Keyboard shortcut keys work. Panel isn't always recognized by gnome power management, in fact the behaviour is similar as on hardy. Sometimes power management recognizes panel only after changing screen brightness by function keys. There seems to be also more problems on gnome power management, it seemed to hang or crash time to time, but no application crash dialog was opened. I don't know how to figure out are these problems related to kernel/acpi or gnome power management.

Very odd thing is that on interpid I seem to have more range on screen brightness adjustment than on other ubuntus I've tested and on windows. Decreasing brightness by keyboard I can completely black the screen, that wasn't before possible.

For production usage I have hardy installed.

Michael Nagel (nailor) wrote :

maybe related to bug 199389

Changed in linux:
status: Incomplete → New
status: New → Incomplete
Michael Nagel (nailor) wrote :

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!

Changed in linux:
status: Incomplete → Invalid
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