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Blank screen after resume

Hi. I just installed Korora 25 Gnome in a Dell XPS 12. If the screen goes blank due to inactivity, if I lock the screen, or if I close the lid and then reopen later, the screen remains blank and I can't get back in. I have to power off (using the power button), and turn back on. How can I solve this? Thanks.

What graphics card do you have? Have you installed any drivers for it?

As you are using Gnome have you tried running in Xorg mode rather than Wayland? Xorg is an option at log in time.

I have: 00:02.0 VGA compatible controller: Intel Corporation HD Graphics 515 (rev 07) 00:13.0 Non-VGA unclassified device: Intel Corporation Device 9d35 (rev 21)

Will try Xorg mode and update the post.... Update: It did not work with Xorg nor classic Gnome either.. Thanks.

Using Xorg didn't solve the issue. I also updated the Bios and that didn't solve it either. Any other ideas? Thanks.

One thing to determine is if the backlight is off or if it is set to zero. I'm guessing you have a key combination to change the brightness, does this work normally? I.e. can you change the brightness when the system is running normally? If so when you resume if you try to increase the brightness does it work? If so then the backlight is working. If not then the backlight isn't switching on. It should be possible to work around either.

The brightness keyboard combination does not work. I tried KDE and Mate and both have the same issue, in both of those, locking the screen does work. The suspend (and closing lid) don't work still.

When you close the screen are you suspending or hibernating? If you are hibernating have you set up a resume device.

To set a resume device you need to add resume=/dev/sdxn to /etc/default/grub (changing the x and n to the correct device for the swap partition, e.g. mine is sdb4 but yours will probably be sda). Then run grub2-mkconfig -o /boot/grub2/grub.cfg (or if on an efi system /boot/efi/EFI/fedora/grub.cfg, if not sure use command completion to show the correct path).

Thanks. again. I tried adding the swap to the grub file and it did not work. One thing about that is that swap is not an sdax partition, it seems to be within another partition. To be explicit, there is a partition sda3 where korora is mounted and the swap is mounted at /dev/korora/swap. I let korora set up the partitioning when I installed it, so that is the way it decided to set it up. Niether suspend nor hibernate work (in MATER you can choose either one).

The default is to use LVM (Logical Volume Management) which creates a primary partition that contains the other partitions. It should still work however that is not your problem as you say neither suspend or hibernate work.

In the kernel boot line do you have nomodeset? If so can you test without it?

I intended to add this to the last post too https://fedoraproject.org/wiki/Common_F25_bugs#Hibernation_doesn.27t_work_from_a_standard_install, just for reference.

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