<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#c26">Comment # 26</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:sebastien.fievet@free.fr" title="sfievet <sebastien.fievet@free.fr>"> sfievet</a> <pre>I have a 3820TG intel Ironlake/radeon 6550M hybrid laptop, and I am affected by this bug too. I tried your "drm/i915: do not disable backlight on vgaswitcheroo switch off" patch on kernel 3.11-rc3 and it works. I have been able to switch from integrated to discrete and back with success. ...But only 3 times :-( I did the following sequence : step #1 : login to X on integrated (intel HD) cat /sys/kernel/debug/vgaswitcheroo/switch 0:DIS-Audio: :Pwr:0000:02:00.1 1:IGD:+:Pwr:0000:00:02.0 2:DIS: :Pwr:0000:02:00.0 echo DDIS > /sys/kernel/debug/vgaswitcheroo/switch step #2 : login to X on discrete (radeon 6550M) cat /sys/kernel/debug/vgaswitcheroo/switch 0:DIS-Audio: :Pwr:0000:02:00.1 1:IGD: :Off:0000:00:02.0 2:DIS:+:Pwr:0000:02:00.0 echo DIGD > /sys/kernel/debug/vgaswitcheroo/switch step #3 : login to X on integrated (intel HD) cat /sys/kernel/debug/vgaswitcheroo/switch 0:DIS-Audio: :Off:0000:02:00.1 1:IGD:+:Pwr:0000:00:02.0 2:DIS: :Off:0000:02:00.0 echo DDIS > /sys/kernel/debug/vgaswitcheroo/switch This time the radeon messes up the display immediately, i.e. it happens before I logout from X. But that's a nice improvement!</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>