https://bugzilla.kernel.org/show_bug.cgi?id=60606 --- Comment #2 from Sebastien Fievet <sebastien.fievet@xxxxxxx> --- After a *lot* of googling effort, I managed to narrow down and find a workaround to this bug. - First, my mistake was to have an xorg.conf.d directory defining the video drivers. Letting X auto detect the driver was the necessary first step. - Second I applied the "drm/i915: do not disable backlight on vgaswitcheroo switch off" patch referenced in https://bugs.freedesktop.org/show_bug.cgi?id=59785 It made switching from IGD to discrete functional, but switching away from IGD with discrete OFF was still screwing up the display. - Finally, I found https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1077675, which was reporting the exact same bug as I was experiencing. Same hardware, same issue. Same workaround : echoing MIGD to /sys/kernel/debug/vgaswitcheroo/switch restores display when discrete is switched back ON - I am now on 3.11.0-rc4 + drm/i915 patch and everything works fine (with the workaround) Conclusion : 1. DPM is not involved at all. 2. Switcheroo doesn't fully support Acer 3820TG hybrid (muxed) laptop out of the box, but workaround exists. If anyone wants to investigate further, I'll be glad to provide any relevant information. Thanks, Seb. -- You are receiving this mail because: You are watching the assignee of the bug. _______________________________________________ dri-devel mailing list dri-devel@xxxxxxxxxxxxxxxxxxxxx http://lists.freedesktop.org/mailman/listinfo/dri-devel
