<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW --- - Can't turn on laptop screen without changing its resolution first" href="https://bugs.freedesktop.org/show_bug.cgi?id=70406#c22">Comment # 22</a> on <a class="bz_bug_link bz_status_NEW " title="NEW --- - Can't turn on laptop screen without changing its resolution first" href="https://bugs.freedesktop.org/show_bug.cgi?id=70406">bug 70406</a> from <a class="email" href="mailto:reztho@archlinux.us" title="reztho@archlinux.us">reztho@archlinux.us</a> <pre>(In reply to <a href="show_bug.cgi?id=70406#c21">comment #21</a>) > The issue with interpreting 0 as off in the ddx is that it is only > definitely true for intel_backlight. For an ACPI backlight, 0 means the low > brightness as defined by the firmware which may be a valid setting that the > user requests. My only suggestion is to shout at whatever userspace is > setting the backlight to 0 after turning off the display and asking them > whether they are serious? I made another test. I stopped the desktop manager (lightdm) and run Xorg with a simple startx, so no desktop environment, just plain xorg. It started with both screens on. I used xrandr to turn off the laptop screen (--output LVDS1 --off) and kept on the external screen. Xrandr --verbose showed me the backlight properties set to 0. And then I run the first xrandr command from the very beginning of this entire thread... and again, the laptop screen doesn't turn on: the backlight properties are still 0. So with no desktop environment, just plain xorg, the problem is still there.</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the QA Contact for the bug.</li> </ul> </body> </html>