I just tried 3.11-rc3, with the important difference that I kept both cards active when suspending.
When resuming, the backlight now came on for a second but the screen then turned dark again. Looking at the logs, the failure now seems less catastrophic than before. Could it be that if I disable one card before suspending (using vgaswitcheroo), the resume code unsuccessfully tries to power up the previously disabled card? Also, I don't seem to get any dpm options in /sys for the discrete card (the 5650), but that's a separate bug I guess. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1010683 Title: ATI Resume from Suspend leads into black screen (VGA_Switcheroo) To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1010683/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
