Public bug reported:
Binary package hint: acpi-support
I'm running Intrepid Ibex Beta from a fresh install on a Haier A61
laptop (probably a rebranded Clevo type). The LCD's brightness can be
lowered by pressing Fn+F8 and increased by pressing Fn+F7. This works
right until Ubuntu boots from GRUB. While in GRUB the brightness control
works.
When booting with acpi=off the backlight control works, however I lose all ACPI
advantages, so this is no fix.
Booting with acpi=ht also leaves the brightness control intact but the system
won't finish booting. Instead it stops with the light brown pre-desktop; the
mouse can still be moved but I cannot even switch to another tty anymore.
All the other boot-options like pci=noacpi, acpi=noirq, pnpacpi=off,
noapic or nolapic have no effect.
None of the workarounds mentioned in the forums or on similar bug
reports worked. I've been trying for almost a year and collected all
kinds of information but no proposed workaround fixed the issue.
---
Output of lsb_release -rd:
Description: Ubuntu intrepid (development branch)
Release: 8.10
---
Output of apt-cache policy acpi-support
acpi-support:
Installed: 0.112
Candidate: 0.112
Version table:
*** 0.112 0
500 http://de.archive.ubuntu.com intrepid/main Packages
100 /var/lib/dpkg/status
** Affects: acpi-support (Ubuntu)
Importance: Undecided
Status: New
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LCD backlight brightness control only works until boot starts
https://bugs.launchpad.net/bugs/279163
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