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Thread: Ubuntu 20.04, Nvidia, and Slack Issue

  1. #1
    Join Date
    Aug 2017

    Ubuntu 20.04, Nvidia, and Slack Issue

    The problem: Recently upgraded from 18.04 to 20.04, mostly without issue except one.After a screen lock, returning to Slack displays many of the panes (sidebar, some channels) black. Exiting Slack and restarting appears to solve it, but it's annoying .... Slack was fine before upgrading to 20.04. Purged and reinstalled both Nvidia drivers and Slack, no love. I believe this to be an Nvidia driver issue but cannot confirm.

    Environment: The issue is primarily with Slack desktop after upgrading to Ubuntu 20.04, but I've seen it in Chrome as well. As below, all packages latest versions. All other applications seem to be fine.

    System Info:
    20.04 LTS, added a bunch of software updates this morning per the software updates prompt, should be latest.
    System76 Gazelle version gaze14
    BIOS INSYDE Corp. version 1.07.09f-1
    CPU 4 cores Intel(R) Core(TM) i7-9750H CPU @ 2.60GHz
    RAM 16GB SODIMM DDR4 Synchronous 2667 MHz
    GPU GeForce GTX 1660 Ti Mobile version a1 (also has onboard Intel, disabled)
    uname -r = 5.4.0-52-generic

    ubuntu-drivers devices
    == /sys/devices/pci0000:00/0000:00:01.0/0000:01:00.0 ==
    modalias : pci:v000010DEd00002191sv00001558sd00008550bc03sc00i00
    vendor   : NVIDIA Corporation
    model    : TU116M [GeForce GTX 1660 Ti Mobile]
    driver   : nvidia-driver-450-server - distro non-free
    driver   : nvidia-driver-450 - distro non-free recommended
    driver   : nvidia-driver-418-server - distro non-free
    driver   : nvidia-driver-435 - distro non-free
    driver   : nvidia-driver-440-server - distro non-free
    driver   : xserver-xorg-video-nouveau - distro free builtin
    Initially the "recommended," V 450 was enabled, I then rolled back to 440 which didn't fix the issue.

    Slack version Production 4.10.3 64-bit
    Chrom(ium) Version 86.0.4240.111 64 bit

    I've done due diligence, been on it a week or so not finding any relevant articles out there, anyone got any ideas?

  2. #2
    Join Date
    Aug 2017

    Re: Ubuntu 20.04, Nvidia, and Slack Issue

    Apparently after chat with Slack, it is not a driver issue, there have been reports. Their suggested fix:

    - At first go to Preferences, disable hardware acceleration.
    - Go to Help->Troubleshooting->Clear Cache and Restart. This will reset your current windows but no big deal.
    - This will log you out of Slack. Go to Help->Troubleshooting->Reset App Data

    Try the first two first, see if it goes away. Then re-enable hardware acceleration, see if it returns. If it persists, do 1 and 3, see if it goes away. If it does, re-enable hardware acceleration.

    Agreed, it's a hit/miss and they don't really know why it's broken, but if it works, it works. In my case I have to leave the machine in a locked screen/sleep state for extended periods of time to reproduce the issue. If I get through a couple of those and it goes away, will return to mark thread as solved.

  3. #3
    Join Date
    Aug 2017

    Re: Ubuntu 20.04, Nvidia, and Slack Issue

    After all of the above: It's hardware acceleration. Official response from Slack:
    In the meantime, it sounds like you've already found the suggested workaround which is to disable hardware acceleration in the app.

    They are working on a fix. I do notice without hardware acceleration the panels/channels seem to load a bit slower, but it's workable.

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