Description of problem:
On Intel skylake models like the Lenovo T460 and the Carbon X1 4th Generation there are screen glitches on RHEL7.3.
This seems to be related to the Intel video driver.
Version-Release number of selected component (if applicable):
Red Hat Enterprise Linux Workstation release 7.3
Steps to Reproduce:
Attached screenshots of glitches.
No glitches seen.
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# lspci | grep -i VGA
00:02.0 VGA compatible controller : Intel Corporation HD Graphics 520 [8086:1916] (rev 07) (prog-if 00 [VGA controller])
Kindly let us know if any further information needed.
what sort of info is needed? we can help and answer questions since we have reported this. RH case id #01773506
A note for anyone trying to reproduce this bug so you don't have to spend the two hours I did trying to: for whatever reason this bug seems to be a lot more likely to happen on high resolution displays. Sometimes it doesn't even appear on 1080p displays, but it doesn't take long to make it happen on 4K.
(In reply to Lyude from comment #14)
> A note for anyone trying to reproduce this bug so you don't have to spend
> the two hours I did trying to: for whatever reason this bug seems to be a
> lot more likely to happen on high resolution displays. Sometimes it doesn't
> even appear on 1080p displays, but it doesn't take long to make it happen on
OK. This is a seriously tough bug to reproduce. But I think I've finally nailed down a reproduction recipe on this machine that makes it happen pretty reliably with slack. + xorg-x11-drv-intel:
- ignore what I said about 4K, the monitor resolution doesn't seem to have anything to do with it
- Maximize the window, this seems to increase the likelihood of it happening
- Zoom in (CTRL + "+") to 150% in slack. The higher the zoom, the more likely it is to happen. At or below 100% zoom, the bug seems to stop occurring on my machine.
- Scroll very slowly up and down chat buffers, random lines will start appearing all over the place between frames.
I have no idea why these are the steps I've been having to take to make this work, since that doesn't seem to be what anyone is doing on their machines in the videos that have been posted here. I don't use slack at all though, so it might be related to the fact there's far less open chat buffers and the like on my machine.
Additionally, I think that using gnome-shell might have something to do with it. In the videos I can see you guys don't seem to actually be using gnome, i wouldn't be entirely surprised if this happens more outside of gnome.
Anyway: going to try to figure out what's broken in xorg-x11-drv-intel now that I've got a reproducer.
Hopefully this will help me actually figure out what's going wrong here and allow QA to actually reproduce this on their machines.
Cool, so I've created a test RPM with a backported fix for this issue. This solves the problem on my end:
Partner managers, could you forward this to the customer and let us know if this fixes your issues?
Customer says upgrading to RHEL 7.4 fixed their problem, closing.