<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO --- - [dual-gpu regression] Display shuts off when switching to discrete graphics card" href="https://bugs.freedesktop.org/show_bug.cgi?id=59785#c6">Comment # 6</a> on <a class="bz_bug_link bz_status_NEEDINFO " title="NEEDINFO --- - [dual-gpu regression] Display shuts off when switching to discrete graphics card" href="https://bugs.freedesktop.org/show_bug.cgi?id=59785">bug 59785</a> from <a class="email" href="mailto:dmallon83@gmail.com" title="David <dmallon83@gmail.com>"> David</a> <pre>Switching back to the intel card does indeed turn the screen back on. My Envy 14 has an i5-460m with a radeon 5650m. As far as I can tell, it seems like the intel card drives the backlight control since prior to 3.7 I only had the single backlight controller in /sys/class/backlight. Just looking at the commit from the bisect I see two adds that I assume could potentially disable the control of the display output settings: + dev_priv->display.crtc_disable(&intel_crtc->base); + for_each_encoder_on_crtc(dev, crtc, encoder) + encoder->disable(encoder); Thanks for the quick response, and let me know if there is more info I can supply.</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>