Linux

  1. Bug #1028151
  2. Comment #32

Comment 32 for bug 1028151

Revision history for this message
Michael Hood (michaelhood) wrote : Re: Samsung Series 900 Laptop brightness control issue

This original issue affected my laptop (NP-QX410; not a Series 900), although perhaps a different behavior.

Prior to 3.2.0-27.43, the samsung-laptop module has never loaded for me. I lived without rfkill, etc.

To get brightness controls working, I had been booting with 'acpi_backlight=vendor'. This left me with only an 'intel_backlight' symlink in /sys/class/backlight (-> ../../devices/pci0000:00/0000:00:02.0/drm/card0/card0-LVDS-1/intel_backlight/). When samsung-laptop started loading, it added an additional samsung link here and seemed to become the target for dimming and brightness operations.

With samsung-laptop loaded, adjusting the brightness (i.e. via Fn-key combinations) did not allow me to achieve the same brightness range that intel_backlight provided. I couldn't get more than ~30% of maximum brightness. Attempting to increase the brightness past this point just results in flickering.