Screens are blinking

Technical Issues and Assistance Hardware
#1

Hello everyone. Sorry for this topic, I'm new in Linux and just begin learning Linux. I've installed Manjaro Gnome recently, and I ran into a problem: my screens are flickering. It's not critical, because I can still work with this issue, but it really annoys for me. Blink effect looks like you record screen from the camera, like that: https://youtu.be/oH9wkQkgMcI?t=178s

I have GeForce RTX 2070 SUPER, the first monitor connected via HDMI, the second monitor connected via HDMI-DP cable, but both monitors are flickering.

I tried changing GRUB_CMDLINE_LINUX_DEFAULT in /etc/default/grub, I added i915.enable_psr=0. After that I ran sudo grub-mkconfig -o /boot/grub/grub.cfg, but it ddin't help me.

#2

Hello,
That is for Intel GPU

Sounds like you are on a Desktop PC. Do you use the nouveau drivers for it or the nvidia one?
Ope terminal and run:
inxi -Fxxxza --no-host
Copy that text and share it here. Use ``` above and bellow it for proper formatting. Also share:
mhwd -li

#3

Thanks a lot for your reply!
Yes, I use Desktop PC. I haven't installed any drivers after linux installation.

Result of inxi -Fxxxza --no-host

System:
  Kernel: 5.4.31-1-MANJARO x86_64 bits: 64 compiler: gcc v: 9.3.0 
  parameters: BOOT_IMAGE=/boot/vmlinuz-5.4-x86_64 
  root=UUID=a032d202-59e8-44a7-aee8-3a1848028160 rw quiet 
  resume=UUID=b9fc7de6-b86b-450f-a9f1-29c40401f629 udev.log_priority=3 
  i915.enable_psr=0 
  Desktop: Gnome 3.36.1 wm: gnome-shell dm: GDM 3.34.1 Distro: Manjaro Linux 
Machine:
  Type: Desktop Mobo: ASUSTeK model: TUF B450M-PRO GAMING v: Rev X.0x 
  serial: <filter> UEFI: American Megatrends v: 1820 date: 09/12/2019 
CPU:
  Topology: 6-Core model: AMD Ryzen 5 3600X bits: 64 type: MT MCP arch: Zen 
  family: 17 (23) model-id: 71 (113) stepping: N/A microcode: 8701013 
  L2 cache: 3072 KiB 
  flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 sse4a ssse3 svm 
  bogomips: 91065 
  Speed: 2195 MHz min/max: 2200/3800 MHz boost: enabled Core speeds (MHz): 
  1: 2195 2: 2196 3: 2195 4: 2195 5: 2195 6: 2195 7: 2196 8: 2196 9: 2196 
  10: 2194 11: 2184 12: 2195 
  Vulnerabilities: Type: itlb_multihit status: Not affected 
  Type: l1tf status: Not affected 
  Type: mds status: Not affected 
  Type: meltdown status: Not affected 
  Type: spec_store_bypass 
  mitigation: Speculative Store Bypass disabled via prctl and seccomp 
  Type: spectre_v1 
  mitigation: usercopy/swapgs barriers and __user pointer sanitization 
  Type: spectre_v2 mitigation: Full AMD retpoline, IBPB: conditional, STIBP: 
  always-on, RSB filling 
  Type: tsx_async_abort status: Not affected 
Graphics:
  Device-1: NVIDIA TU104 [GeForce RTX 2070 SUPER] vendor: Gigabyte 
  driver: nouveau v: kernel bus ID: 06:00.0 chip ID: 10de:1e84 
  Display: x11 server: X.org 1.20.8 driver: modesetting 
  alternate: fbdev,nouveau,nv,vesa compositor: gnome-shell 
  resolution: <xdpyinfo missing> 
  OpenGL: renderer: llvmpipe (LLVM 9.0.1 128 bits) v: 3.3 Mesa 20.0.4 
  compat-v: 3.1 direct render: Yes 
Audio:
  Device-1: NVIDIA TU104 HD Audio vendor: Gigabyte driver: snd_hda_intel 
  v: kernel bus ID: 06:00.1 chip ID: 10de:10f8 
  Device-2: AMD Starship/Matisse HD Audio vendor: ASUSTeK 
  driver: snd_hda_intel v: kernel bus ID: 08:00.4 chip ID: 1022:1487 
  Device-3: Logitech 960 Headset type: USB 
  driver: hid-generic,snd-usb-audio,usbhid bus ID: 1-6:6 chip ID: 046d:0a45 
  serial: <filter> 
  Sound Server: ALSA v: k5.4.31-1-MANJARO 
Network:
  Device-1: Realtek RTL8111/8168/8411 PCI Express Gigabit Ethernet 
  vendor: ASUSTeK driver: r8169 v: kernel port: f000 bus ID: 04:00.0 
  chip ID: 10ec:8168 
  IF: enp4s0 state: up speed: 1000 Mbps duplex: full mac: <filter> 
Drives:
  Local Storage: total: 1.36 TiB used: 46.12 GiB (3.3%) 
  ID-1: /dev/sda vendor: Western Digital model: WD10EZEX-75WN4A1 
  size: 931.51 GiB block size: physical: 4096 B logical: 512 B 
  speed: 6.0 Gb/s rotation: 7200 rpm serial: <filter> rev: 7113 scheme: GPT 
  ID-2: /dev/sdb vendor: Samsung model: SSD 860 EVO 250GB size: 232.89 GiB 
  block size: physical: 512 B logical: 512 B speed: 6.0 Gb/s 
  serial: <filter> rev: 4B6Q scheme: GPT 
  ID-3: /dev/sdc vendor: Samsung model: SSD 860 EVO 250GB size: 232.89 GiB 
  block size: physical: 512 B logical: 512 B speed: 6.0 Gb/s 
  serial: <filter> rev: 4B6Q scheme: GPT 
Partition:
  ID-1: / raw size: 50.00 GiB size: 49.15 GiB (98.31%) 
  used: 15.04 GiB (30.6%) fs: ext4 dev: /dev/sdc2 
  ID-2: /home raw size: 178.38 GiB size: 174.58 GiB (97.87%) 
  used: 31.07 GiB (17.8%) fs: ext4 dev: /dev/sdc3 
  ID-3: swap-1 size: 4.00 GiB used: 0 KiB (0.0%) fs: swap 
  swappiness: 60 (default) cache pressure: 100 (default) dev: /dev/sdc1 
Sensors:
  System Temperatures: cpu: 51.4 C mobo: N/A gpu: nouveau temp: 28 C 
  Fan Speeds (RPM): N/A gpu: nouveau fan: 843 
Info:
  Processes: 340 Uptime: 2h 03m Memory: 15.63 GiB used: 9.16 GiB (58.6%) 
  Init: systemd v: 244 Compilers: gcc: 9.3.0 clang: 9.0.1 Shell: bash 
  v: 5.0.16 running in: gnome-terminal inxi: 3.0.37
#4

Result of mhwd -li

Warning: No installed PCI configs!
Warning: No installed USB configs!
#5

That is not quite useful for that GPU model, plus

Is like you would be on a virtual machine, so the GPU is not working at the potential it has. Install the proper driver:
sudo mhwd -i pci video-nvidia-440xx
then reboot your system and report back.

Thanks for not following my typo :wink:

#6

After driver installation I rebooted my computer. Now system can't be started, only black screen is displayed with blinked underscore.

#7

How to rollback these changes now? :slight_smile:

#8

Press Ctrl+ALT+F3 then back to CTRL+ALT+F1 ... Do you get the Desktop?
Please remove the

From grub and update it. Reboot again after that.

If that doesn't work you can from Ctrl+ALT+F3 (TTY3) to remove the driver
sudo mhwd -r pci video-nvidia-440xx
and install back the nouveau driver
sudo mhwd -i pci video-linux
but to me this makes no sense.

#9

When i pressed Ctrl + Alt + F3 console was opened, and then Ctrl + Alt + F1 returned to the black screen with underscore again, it didn't help me.

I removed driver video-nvidia-440xx as you suggested, now I am able to login to the system.
Also, I removed i915.enable_psr=0 from grub and rebooted.

#10

My suggestion was in a particular order, and removing the nvidia driver as last resort. Anyway ... i'll step out from this topic.

#11

Oh sorry, I didn't figure out, I will try to install the driver again with removed i915.enable_psr=0 option.

#12

Ok, but remove the video-linux before installing the video-nvidia-440xx
sudo mhwd -r pci video-linux
then run
sudo mhwd -i pci video-nvidia-440xx

I honestly don't know why would hang the system to balk screen. Also remove tlp since you are on a Desktop PC. Also, maybe wayland session is enabled on your system and you log in automatically to it? Best would be to test in X11 session first.

1 Like
#13

Yeap, I did as you said. Also, I made sure that only one driver is available, I ran command mhwd --pci -li and it displayed only one driver: video-nvidia-440xx, but I didn't help, black screen is still displayed after reboot. I don't know what wayland session means and I don't know how to test in X11 session, sry :slight_smile:

#14

Ok, we can try a few things. While in the GRUB boot menu press e to edit it. On the linux line remove quiet and replace it with nomodeset, then press F10 to save and continue booting. There should be now a message where the system hangs.

EDIT: we should make sure your system is updated:
sudo pacman-mirrors -f && sudo pacman -Syyu
Install the second kernel just in case
sudo mhwd-kernel -i linux56
Reboot. In GRUB you can select what kernel to use and you can add the kernel parameters i mentioned. There should be no issue and i can't make much sense why in your case the issue persists.

#15

I ran sudo pacman-mirrors -f && sudo pacman -Syyu and during installing I lost electricity in my home. The installation didn't finish, now the system can't be started. Are there any solutions to rollback installation?

#16

You will need to chroot the system from the install media and finish the update.

#17

I can't. When I choose Manjaro Linux in boot menu, I have the following error:

error: file `/boot/vmlinuz-5.4-x86_64' not found.
error: you need to load the kernel first.
#18

No! You have to boot from LIVE MEDIA, not the installed system.

#19

Oh, I got it, thanks. I am downloading live CD, I will try

#20

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