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VSE: Sequencer & Playhead drawing is broken.
Needs Triage, NormalPublic

Description

System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: Intel(R) UHD Graphics 600 Intel 4.5.0 - Build 27.20.100.8476

Blender Version
Broken: version: 2.91.0 Alpha, branch: Latest Master, commit date: 06/09 2020

Short description of error
Having Blender running, and after closing the laptop lid, having it hibernating and reopening it the sequencer drawing behaves like this(sequencer area is not redrawn properly, sometimes the panels also goes rainbow colored):

Event Timeline

Richard Antalik (ISS) changed the task status from Needs Triage to Needs Information from User.Mon, Sep 7, 6:37 AM

Problem with rainbow panels may be unrelated, but I am not sure if that is the case for 100%.

Does this happen with 2.90?

Try rebuilding. I was experiencing the rainbow panels upon open Blender with various master builds over the last two days. There were additional changes made 2 hours after you created this report. The issue still showed up upon rebuilding for me, but went away after opening and closing Blender a couple of times. My guess is that the opening and closing causes the previous shader cache to clear.

Peter Fog (tintwotin) added a comment.EditedMon, Sep 7, 8:47 PM

It is still happening. Here's a build of the latest master(only with Richard's Transfrom patch(unrelated to the bug) applied):

T80327 was fixed today so plese check if this is issue in latest build.

A build including that patch, still have that bug:

Are you unable to reproduce it?

A build including that patch, still have that bug:

Are you unable to reproduce it?

I am not able to reproduce.

I have looked at commits from few days before this report, I am not sure how often you compile though.

Possible suspects are
rBd6d2897ef04a7c1b3d5fb357629e534055629857
rBab95cdaba970a30127d804bd1e66ad25ab021ec1
rBbac4606937514405641659d91a30bf3e6832cdf7
Can you do bisect (lot of compiling see end of page https://wiki.blender.org/wiki/Process/Bug_Reports/Triaging_Playbook#Valid_Bug_Reports) or checkout one commit before one of these listed, build and check if there is bug?

@Clément Foucault (fclem) do you know what could caused this?

I'm sorry, but making full builds on my computer is far too slow to do the bisecting. Doing 10 full builds would take me 15-20 hours.

Richard Antalik (ISS) changed the task status from Needs Information from User to Needs Triage.Tue, Sep 15, 11:14 AM

I'm sorry, but making full builds on my computer is far too slow to do the bisecting. Doing 10 full builds would take me 15-20 hours.

I understand

Does this happen with the normal timeline?
What if you hide the preview area?
What if you delete all the strips one by one?

Also please attach the result of running the blender with the blender_debug_gpu.cmd and blender_debug_gpu_glitchworkaround.cmd.

Also please attach the system-info.txt

Do none of you see this after waking up the computer after it's been sleeping(while Blender is running with some video in the sequencer and preview)?
What if you use Sequencer/Preview mode?
(My time is limited)