<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW --- - [IVB Regression] Backlight is not adjustable and set at maximum level in kernels 3.16-rcX on HD 4000" href="https://bugs.freedesktop.org/show_bug.cgi?id=81515#c7">Comment # 7</a> on <a class="bz_bug_link bz_status_NEW " title="NEW --- - [IVB Regression] Backlight is not adjustable and set at maximum level in kernels 3.16-rcX on HD 4000" href="https://bugs.freedesktop.org/show_bug.cgi?id=81515">bug 81515</a> from <a class="email" href="mailto:rakothedin@gmail.com" title="Hohahiu <rakothedin@gmail.com>"> Hohahiu</a> <pre>Hello, Chris. Finally I found a workaround ( had to go and see the code for an appropriate kernel parameter). So with video.use_native_backlight=-1 (not sure what it really means) the backlight works as before. The /sys/class/backlight folder also contains: acpi_video0 acpi_video1 intel_backlight. As far as I understand in 3.16-rc1 the default value for use_native_backlight was set to 1. Just for reference: linux@linux:/sys/class/backlight> grep '.*' /sys/class/dmi/id/*_* 2> /dev/null /sys/class/dmi/id/bios_date:01/02/2013 /sys/class/dmi/id/bios_vendor:Insyde /sys/class/dmi/id/bios_version:F.0B /sys/class/dmi/id/board_asset_tag:Type2 - Board Asset Tag /sys/class/dmi/id/board_name:1851 /sys/class/dmi/id/board_vendor:Hewlett-Packard /sys/class/dmi/id/board_version:59.14 /sys/class/dmi/id/chassis_asset_tag:CNU229926N /sys/class/dmi/id/chassis_type:10 /sys/class/dmi/id/chassis_vendor:Hewlett-Packard /sys/class/dmi/id/chassis_version:Chassis Version /sys/class/dmi/id/product_name:HP ENVY 15 Notebook PC /sys/class/dmi/id/product_version:078F110000204810000620100 /sys/class/dmi/id/sys_vendor:Hewlett-Packard So should I open new bug report against ACPI? Or what is the real problem?</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are on the CC list for the bug.</li> </ul> </body> </html>