It sounds like a problem with PSR (panel self refresh). To test that
theory try disabling PSR by adding a kernel parameter:
GRUB_CMDLINE_LINUX="i915.enable_psr=0"
in /etc/default/grub and then run:
sudo update-grub
and reboot.
If the problem isn't solved then check the parameter has been applied in
/proc/cmdline
** Package changed: xorg (Ubuntu) => linux (Ubuntu)
** Changed in: linux (Ubuntu)
Status: New => Incomplete
** Summary changed:
- Screen turns black (but backlit) while image isn't being updated
+ [Dell Inspiron 5400 2n1] Screen turns black (but backlit) while image isn't
being updated
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https://bugs.launchpad.net/bugs/2109762
Title:
[Dell Inspiron 5400 2n1] Screen turns black (but backlit) while image
isn't being updated
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