<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#c4">Comment # 4</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>(In reply to <a href="show_bug.cgi?id=81515#c3">comment #3</a>) > 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. Hello, Chris. Thanks you for your reply. As you suggested I removed those kernel parameters. Also I tried "video.use_vendor_backlight=1" and it did not help. According to dmesg this is unknown parameter (see attached dmesg). Also in 3.15.5 kernel my /sys/classs/backlight folder has three subfolders: acpi_video0 acpi_video1 intel_backlight So is there anything else I can try?</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>