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Thread: Login Screen Flickering

  1. #1

    Default Login Screen Flickering

    Today after I rebooted my system after a game crashed my login screen was a command line one, and it was rapidly flickering. I can't even login because its takes multiple key hits to enter a letter sometimes, and as I can't see my password, I can't login. After looking around this seems to be a problem with Nvidia. I had the proprietary driver for my card (Nvidia Geforce GTX 740), and I have to remove the mesa driver or something like that. I can't even login though.

  2. #2
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    Default Re: Login Screen Flickering

    At boot time, when the Grub menu comes up, hit the "e" key.

    This will allow you to edit the boot command line.

    Scroll your cursor down to the front of the line that starts with "linux" (could be linux, or linux-efi or something like that), hit the "End" key to get to the proper end of that line (it wraps on the screen, so the End key is surest to get you to the right place), add a space, then add
    Code:
    nomodeset
    Hit F11 to continue booting. (I *think* it is F11, been a long time since I had to do that, so read the screen to check whether it is F11 or F10).

    That should get you up into openSUSE where you can fix your nvidia problems.
    Last edited by Fraser_Bell; 16-Sep-2018 at 15:48.
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  3. #3
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    Default Re: Login Screen Flickering

    Quote Originally Posted by Boi_Stevens View Post
    Today after I rebooted my system after a game crashed my login screen was a command line one, and it was rapidly flickering. I can't even login because its takes multiple key hits to enter a letter sometimes, and as I can't see my password, I can't login. After looking around this seems to be a problem with Nvidia. I had the proprietary driver for my card (Nvidia Geforce GTX 740), and I have to remove the mesa driver or something like that. I can't even login though.
    Fist, I cannot imagine a game crashing damaging your system like this.
    I suspect the video card. You could take it out, clean the connectors and put it back in ( sometimes this can help ), but given the fact that you get a flickering consol I suspect the card is broken.
    What you can try to find out, is to downlad a Leap live image and see if the runs properly. If so, that means the system's install is seriously damaged.
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  4. #4

    Default Re: Login Screen Flickering

    I added nomodeset and booted up my system and and nothing changed. Still a flickering Cl login screen. It did display this though at the top:

    Code:
    [     4.839541] sd 8:0:0:0: [sdb] No caching mode page found
    [     4.839673] sd 8:0:0:0: [sdb] Assuming drive cache: write through
    I don't know if that means anything, but I'm gonna try installing OpenSUSE again to see if it fixes it. If not, it's probably with my GPU. Does anyone have experience with this or know what's causing it?

  5. #5
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    Default Re: Login Screen Flickering

    Quote Originally Posted by Boi_Stevens View Post
    I added nomodeset and booted up my system and and nothing changed. Still a flickering Cl login screen. It did display this though at the top:

    Code:
    [     4.839541] sd 8:0:0:0: [sdb] No caching mode page found
    [     4.839673] sd 8:0:0:0: [sdb] Assuming drive cache: write through
    I don't know if that means anything, but I'm gonna try installing OpenSUSE again to see if it fixes it. If not, it's probably with my GPU. Does anyone have experience with this or know what's causing it?
    Any USB stick or SD card connected to the machine ?
    And like said, it looks like a GPU issue.
    Reinstalling should bring exactly the same situation. If not, I wouldn't trust the installer.
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  6. #6

    Default Re: Login Screen Flickering

    I had a USB stick with a linux installation, but I didn't put it as a boot priority in bios so It didn't matter. I did it again without the usb and same thing happened. Do you know why nomodeset didn't work? There has to be some other way to get in my system. Is there a way using an older snapshot or an older kernel version? I've already tried many things.

    I think this error is from my proprietary driver. I have to update it everytime the kernel updates, so that's what's causing it I guess. Was there a kernel update recently?

    I don't want to have to buy a new GPU, especially since this one is only about 1 year old. Any more possible causes of this?

  7. #7
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    Default Re: Login Screen Flickering

    Download a live image, create a USB stick from it, and boot from that. If everything is normal when doing so, I think you'd better reinstall. But I do believe this is a hardware issue. Otherwise your system is seriously borked.
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