<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW --- - [ivb (optimus) LVDS] Boots to blank screen" href="https://bugs.freedesktop.org/show_bug.cgi?id=59726#c13">Comment # 13</a> on <a class="bz_bug_link bz_status_NEW " title="NEW --- - [ivb (optimus) LVDS] Boots to blank screen" href="https://bugs.freedesktop.org/show_bug.cgi?id=59726">bug 59726</a> from <a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> Chris Wilson</a> <pre>UXA: [ 6.960] (--) intel(0): found backlight control interface /sys/class/backlight/acpi_video1 SNA: [ 6.907] (--) intel(0): found backlight control interface acpi_video1 (type 'firmware') So the bad news is that your system is advertising acpi_video1 as the right backlight controller for your display, but it sounds like that it is the wrong one. Try something like acpi_backlight=vendor or acpi_backlight=legacy The bug sounds like it solely lies in acpi_video1 being dysfunctional and still claiming to be the right interface to use.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> <li>You are the assignee for the bug.</li> </ul> </body> </html>