<html> <head> <base href="https://bugs.freedesktop.org/"> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - Intel - display brightness control not working with i915.fastboot=1" href="https://bugs.freedesktop.org/show_bug.cgi?id=103781#c14">Comment # 14</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO - Intel - display brightness control not working with i915.fastboot=1" href="https://bugs.freedesktop.org/show_bug.cgi?id=103781">bug 103781</a> from <a class="email" href="mailto:arthurborsboom@gmail.com" title="Arthur Borsboom <arthurborsboom@gmail.com>"> Arthur Borsboom</a> <pre>The original problem is not the fact that the screen goes completely black. The original problem is that the brightness cannot be changed, except after pressing the Fn-Brightness-down for 10 or 20 times and then the screen turns black. I will summarize the differences by the behavior below. ----------------------------------------------------------- Fastboot disabled (default) / everything works as expected ----------------------------------------------------------- Brightness keys function as expected. Brightness up + down keys change the intensity of the backlight with certain steps. Pressing the down button many times, will lower the backlight and finally turns of the screen and results in a black screen. ------------------------------------------------------------- Fastboot enabled with kernel 4.13.11 - 4.15.5 (original problem) ------------------------------------------------------------- Pressing the brightness keys does not change the intensity of the backlight. Pressing the brightness down key many times, results in a black screen. ------------------------------------------------------------- Fastboot enabled with kernel 4.18.5 - 4.15.5 ------------------------------------------------------------- Pressing the brightness keys does not change the intensity of the backlight. Pressing the brightness down key many times, does not result in a black screen anymore. I am not sure if that is good or bad, but something did change in comparison to previous kernels. In other words, with fastboot enabled, I cannot change the brightness of the screen anymore with the brightness keys, as was the case without fastboot enabled. Does this help sufficiently to understand the issue?</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are on the CC list for the bug.</li> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>