<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#c3">Comment # 3</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:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> Chris Wilson</a> <pre>Try video.use_vendor_backlight=1. Also "i915.i915_enable_rc6=7 i915.i915_enable_fbc=1 i915.lvds_downclock=1" is completely useless and more often dangerous. Fortunately for you the dangerous options in there do not match the module parameters. If you look at the old kernel (best shown by the Xorg.log for 3.15) I guess it is using the acpi backlight.</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>