Bug#670958: [regression] HP ProBook 451x: udev/power_supply battery oscilates between remove and add
Package: src:linux-2.6
Followup-For: Bug #670958
Hi. I return with new info.
So, I tried the latest upstream kernel (3.4.0-rc5+) and the problem is
still there.
In the meantime, I stumbled upon a forum thread [1] on the Archlinux
forum which describes that after kernel 2.6.38.2-1, backlight setting
stopped working on 2 HP laptop models. Backlight isn't working on my
model as well (since as far as I can remember). I tried with
acpi_backlight=video, acpi_backlight=legacy and acpi_backlight=vendor at
boot, but nothing worked. Backlight doesn't work neither by setting
/sys/class/backlight/acpi_video0/brightness.
1: https://bbs.archlinux.org/viewtopic.php?id=117556
So this is starting to look like an ACPI problem more and more. And I'm
betting it affects the majority of HP laptops released after 2008 - 2009
which have the same ACPI and BIOS implementation.
So far I have determined that the following HP laptop models are
affected:
- HP Probook 451x
- HP Compaq 315 (Ralf's)
- HP 6735-s (alculquicondor from the Archlinux forum thread)
ACPI functionalities that are broken so far:
- power_supply (battery and AC events - this bug)
- backlight setting
I don't know what's the next best course of action. I guess I can start
getting dirty and bissecting the releases between 2.6.37 and
2.6.38~rc6... I hope to have some results soon.
-- System Information:
Debian Release: wheezy/sid
APT prefers testing
APT policy: (500, 'testing')
Architecture: i386 (i686)
Kernel: Linux 3.2.0-2-686-pae (SMP w/2 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Reply to: