I have a lenovo ideapad 720s (4k screeen). I installed ubuntu on dual boot and with ubuntu there is a weird screen flickering which comes right after grub menu and persists. I have never faced this on Windows and therefore driver issues can be ruled out.
I have tried different os : fedora, mint, ubuntu and the issue persists with all. here is a video for the same :
there is a similar bug on https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1785912 wherein it was asked to raise it here.
Kindly help me!
description: VGA compatible controller
product: Intel Corporation
vendor: Intel Corporation
physical id: 2
bus info: pci@0000:00:02.0
width: 64 bits
capabilities: pciexpress msi pm vga_controller bus_master cap_list rom
configuration: driver=i915 latency=0
resources: iomemory:2f0-2ef iomemory:2f0-2ef irq:127 memory:2ff2000000-2ff2ffffff memory:2fc0000000-2fcfffffff ioport:3000(size=64) memory:c0000-dffff
00:02.0 VGA compatible controller : Intel Corporation UHD Graphics 620 [8086:5917] (rev 07)
Subsystem: Lenovo UHD Graphics 620 [17aa:39af]
Kernel driver in use: i915
Kernel modules: i915
This bug is a duplicate of 108132,
*** This bug has been marked as a duplicate of bug 108132 ***
If you could post any findings or provide help on that bug, that would be great. I'm not a dev here.
So the flickering only occurs for some time after the screen wakes (ie. either from hibernation, screen lock(when screen turns black) or a boot). I have seen that on battery, the flicker vanishes pretty quickly than when plugged in.
Also, once stabilized, the flicker is not observed in that session till the screen turns black (lock, hibernate, boot).