Toshiba laptop Qosmio X875 always resumes from suspend with a wildly flashing screen: no discernable image, just bright flashes, and sometimes a worrisome synchonized sound. Version-Release number of selected component (if applicable): How reproducible: 100% of the time. Every F25 kernel from 4.8.6-300 to 4.9.7-201 (fc25.x86_64) Steps to Reproduce: 1. Suspend (by pushing the power button) 2. Resume (by pushing the power button, or opening the laptop) 3. FnF2, FnF3 will darken and brighten the flicker. 4. On the first attempt to resume, it often happens that pressing Ctrl-Alt-(F3 or F4) the flickering ends with a switch to a virtual terminal. IF this succeeds, Ctrl-Alt-(F1 or F2) will get back to GNOME. However, after a second suspend, the system resumes with the same flicker, but this time Ctrl-Alt-Fn does not help. 5. If Ctrl-Alt-Fn does not work, hard power off seems to be the only way forward. 6. Keyboard NumLock and CapsLock toggle lights, but that's the only response I have found. Please let me know what logs or debugging steps may be helpful!
Even a pointer to current documentation would be great. Or a comment on what portions of the old documentation are still applicable today? For example, is https://www.kernel.org/doc/Documentation/power/basic-pm-debugging.txt applicable to F25? I ask because the clearest documentation I have found on debugging suspend resume problems dates from 2007 and 2011. Since then fedora has changed init -> systemd and xorg -> wayland, and it is not clear whether that is just a change in chrome or in plumbing. For example https://fedoraproject.org/wiki/Common_kernel_problems#Suspend.2FResume_failure uses pm-suspend, which seems to not exist in F25.
hello?
Created attachment 1265209 [details] Excerpt from dmesg output while resume is in process I suspect the following output of dmesg is relevant. Longer excerpt attached. [] nouveau 0000:01:00.0: disp: outp 08:0006:0344: link training failed [] nouveau 0000:01:00.0: disp: outp 08:0006:0344: link training failed [] nouveau 0000:01:00.0: disp: outp 08:0006:0344: link not trained before attach
I have changed 'component' to xorg-x11-drv-nouveau (if there is a better choice, please advise or reassign!) because I found that installing the nvidia drivers from rpmfusion permitted resume without flashing. Please note. nvidia drivers have the side effect of disabling the effect of the brightness control keys (keys still pop up the sun symbol, the slider moves but brightness does not change.) Booting with the "safemode" nouveau drivers still gives the flashing upon resume.
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