Dell Studio 1558 w/ core i7 + radeon hd5400 series, some issues

Michael Schmitt tcwardrobe at
Wed May 30 08:55:45 CDT 2012

Hi list,

I have a Dell Studio 1558 here and some issues with it. I guess most 
issues are due to missing kernel support for some peculiarities of this box.

1.) Battery only holds for about 2 hours. Is that quite normal for the 
radeon / i7 edition? The radeon card is already set to its lowest 
setting (echo low > /sys/class/drm/card0/device/power_profile).

2.) Set charger behavior to "disabled/enabled" in GNU/Linux, any way to 
do it? If not, would it be possible to get the specs of that feature so 
a kernel / acpi / whatever hacker may have a look there? Hibernate and 
changing that in the BIOS works, but it is kinda annoying.

3.) Display brightness not changeable in GNU/Linux. The hardware keys 
work and plugging in ac-power or running only on batteries does change 
the brightness. Not reliable (sometimes it changes from low to high when 
disconnecting the power-cord or the other way around

I run Debian GNU/Linux "sid" amd64 on that box, with currently kernel 
3.2.18-1 (debian package linux-image-3.2.0-2-amd64), gnome 3 or mate 
(did change to mate a few days back).

Any hints or ideas about the issues? Any help is greatly appreciated.


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