Description of problem: After updating to kernel-4.6.3-300.fc24.x86_64.rpm, my Lenovo T450s will wake from sleep, but the display backlight will be completely off. Pressing ctrl + alt + F2 will wake it up. Version-Release number of selected component (if applicable): kernel 4.6.3-300.fc24.x86_64 How reproducible: Always Steps to Reproduce: 1. Put laptop to sleep by closing lid. 2. Wake laptop up by opening lid. Actual results: Backlit keyboard lights up and system resumes, but screen remains off Expected results: Screen lights up as in previous releases. Additional info: Worked fine in 4.5.7-300.fc24, 4.5.7-300.fc23, and 4.5.7-200.fc23.
*** Bug 1352185 has been marked as a duplicate of this bug. ***
My Lenovo T460s laptop is not at all showing anything after grub auto-selects kernel-4.6.3-300.fc24. The last known working kernel for my laptop is kernel-4.5.7-300.fc24.x86_64 I too have backlit issues since last 2-3 kernel updates as well. Not sure since which kernel update it started.
Same thing occurs for me on a Dell Precision 7510. If I go back to kernel 4.5.7-200.fc23.x86_64 everything works fine again but any more recent kernel shows this problem. I would add that this screen blank issue also occurs on boot after kernel selection on grub screen intermittently for me with the kernels after 4.5.7-200.fc23.x86_64. Not sure if related but seems so.
I am seeing the same symptoms as the initial reporter, on my Lenovo Thinkpad T400s using i915 graphics: the display remains dark after suspend+resume, and it does not help to try to use the Fn+buttons that normally make the screen darker or brigther. This has been tested on 4.6.3-300.fc24.x86_64 as well as 4.6.4-301.fc24.x86_64 (from updates-testing). On 4.6.4-301.fc24.x86_64, I also managed to use the trick by changing terminal with Ctrl-Alt-F1/Ctrl-Alt-F2 to get the screen to light up (half-way bright, but then the Fn-buttons worked again to make it brighter). Last kernel I have tested without this problem is 4.5.7-300.fc24.x86_64.
(In reply to Ari from comment #3) > Same thing occurs for me on a Dell Precision 7510. If I go back to kernel > 4.5.7-200.fc23.x86_64 everything works fine again but any more recent kernel > shows this problem. > > I would add that this screen blank issue also occurs on boot after kernel > selection on grub screen intermittently for me with the kernels after > 4.5.7-200.fc23.x86_64. Not sure if related but seems so. This is still happening for a new kernel releases so far. I have tried with these kernels and all exhibit the same issue with resuming kernel-4.5.7-202.fc23.x86_64 kernel-4.6.3-300.fc24.x86_64 kernel-4.6.4-301.fc24.x86_64 kernel-4.6.5-300.fc24.x86_64 kernel-4.6.6-300.fc24.x86_64 kernel-4.6.7-300.fc24.x86_64 kernel-4.7.2-201.fc24.x86_64 The only one that works is kernel-4.5.7-200.fc23.x86_64 The interesting thing is that all of these will properly resume if I close my laptop for only a minute or two but if for longer periods (like overnight) then it fails to resume properly. Hitting any Ctrl-Alt-F<#> does nothing, screen stays blank. I am happy to help out or supply any info needed to resolve this, I just don't know where to look myself.
Exactly same issue here with Lenovo X1 Carbon.
My symptoms from https://bugzilla.redhat.com/show_bug.cgi?id=1352184#c4 are still present in 4.7.4-200.fc24.x86_64. The screen is dark after screen locking and suspend/resume, but pressing Ctrl-Alt-F1 brings it back to life at reduced level (which can then be adjusted with the Fn-Home/Fn-End buttons as normally)
*********** MASS BUG UPDATE ************** We apologize for the inconvenience. There are a large number of bugs to go through and several of them have gone stale. Due to this, we are doing a mass bug update across all of the Fedora 24 kernel bugs. Fedora 25 has now been rebased to 4.10.9-100.fc24. Please test this kernel update (or newer) and let us know if you issue has been resolved or if it is still present with the newer kernel. If you have moved on to Fedora 26, and are still experiencing this issue, please change the version to Fedora 26. If you experience different issues, please open a new bug report for those.
My symptoms from https://bugzilla.redhat.com/show_bug.cgi?id=1352184#c4 are still present in 4.10.9-200.fc25.x86_64 (just fetched from updates-testing) on Fedora 25. The screen is dark after screen locking and suspend/resume, but pressing Ctrl-Alt-F1 brings it back to life at reduced level (which can then be adjusted with the Fn-Home/Fn-End buttons as normally)
(I did not intend to clear needinfo - I filed https://bugzilla.redhat.com/show_bug.cgi?id=1443979 instead )
I have this problem still as well. Sometimes better, sometimes not. Short time suspend/resume seems to have a better chance of success in bringing the screen back up. I'm on a Lenovo W550s which has the "Switch Display/Presenter Mode" button. Tapping that a few times cycles through the different modes for displays, and that seems to get me back (randomly) to the correct display. Maybe test that function if supported, I'm not sure what it's called, but it's the Fn button that switches to your VGA/DP port for presenting. That said, it's still not working as expected, but my guess is that it has something to do with display output, or my discrete nVidia card. I don't think the T450s has a discrete card, so maybe that's not it, maybe it's just a monitor output thing? There was another thread somewhere down the rabbit hole on another site where a dual display guy had modified his ~/.config/monitors.xml file and copied a section back into the GDM config. I'm willing, but I certainly didn't do that to get where I am now, so I am hesitant to fix something in a way I didn't break it first...anyone else have success with switching the display to presentation mode?
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