Flickering login screen

Hello, I’ve just installed Fedora on my PC but screen kept flickering. After some time I saw that’s the problem disappears when I decrease FPS to 60 but it still keeps flickering while I’m logging in the system.
I’m new to Linux and is there any way to solve the problem?

Image quality is also much worse than it was on Windows. Should I install any drivers to fix it or the drivers were installed in the Fedora installation?

Sorry for my English if I said something wrong. Thank you!

Welcome to Ask Fedora! Please see #start-here for information on getting acquainted with the community.

What GPU do you have? (You can run sudo lspci to check if you’re not sure.) In particular, if you’re on NVIDIA, you should try using the proprietary driver by:

1 Like

I am not sure what GPU is but if GPU means video card, so I have GV-RX570GAMING-8GD-MI gigabyte.
And that’s what terminal answers for the command:

00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-0fh) Root Complex
00:00.2 IOMMU: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-0fh) I/O Memory Management Unit
00:01.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-1fh) PCIe Dummy Host Bridge
00:01.3 PCI bridge: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-0fh) PCIe GPP Bridge
00:02.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-1fh) PCIe Dummy Host Bridge
00:03.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-1fh) PCIe Dummy Host Bridge
00:03.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-0fh) PCIe GPP Bridge
00:04.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-1fh) PCIe Dummy Host Bridge
00:07.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-1fh) PCIe Dummy Host Bridge
00:07.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-0fh) Internal PCIe GPP Bridge 0 to Bus B
00:08.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-1fh) PCIe Dummy Host Bridge
00:08.1 PCI bridge: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-0fh) Internal PCIe GPP Bridge 0 to Bus B
00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD] FCH SMBus Controller (rev 59)
00:14.3 ISA bridge: Advanced Micro Devices, Inc. [AMD] FCH LPC Bridge (rev 51)
00:18.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-0fh) Data Fabric: Device 18h; Function 0
00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-0fh) Data Fabric: Device 18h; Function 1
00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-0fh) Data Fabric: Device 18h; Function 2
00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-0fh) Data Fabric: Device 18h; Function 3
00:18.4 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-0fh) Data Fabric: Device 18h; Function 4
00:18.5 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-0fh) Data Fabric: Device 18h; Function 5
00:18.6 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-0fh) Data Fabric: Device 18h; Function 6
00:18.7 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-0fh) Data Fabric: Device 18h; Function 7
01:00.0 USB controller: Advanced Micro Devices, Inc. [AMD] Device 43d0 (rev 01)
01:00.1 SATA controller: Advanced Micro Devices, Inc. [AMD] 400 Series Chipset SATA Controller (rev 01)
01:00.2 PCI bridge: Advanced Micro Devices, Inc. [AMD] 400 Series Chipset PCIe Bridge (rev 01)
02:00.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] 400 Series Chipset PCIe Port (rev 01)
02:04.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] 400 Series Chipset PCIe Port (rev 01)
02:06.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] 400 Series Chipset PCIe Port (rev 01)
02:07.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] 400 Series Chipset PCIe Port (rev 01)
02:09.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] 400 Series Chipset PCIe Port (rev 01)
04:00.0 USB controller: ASMedia Technology Inc. ASM1142 USB 3.1 Host Controller
06:00.0 Ethernet controller: Intel Corporation I211 Gigabit Network Connection (rev 03)
08:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere [Radeon RX 470/480/570/570X/580/580X/590] (rev ef)
08:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Ellesmere HDMI Audio [Radeon RX 470/480 / 570/580/590]
09:00.0 Non-Essential Instrumentation [1300]: Advanced Micro Devices, Inc. [AMD] Zeppelin/Raven/Raven2 PCIe Dummy Function
09:00.2 Encryption controller: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-0fh) Platform Security Processor
09:00.3 USB controller: Advanced Micro Devices, Inc. [AMD] Zeppelin USB 3.0 Host controller
0a:00.0 Non-Essential Instrumentation [1300]: Advanced Micro Devices, Inc. [AMD] Zeppelin/Renoir PCIe Dummy Function
0a:00.2 SATA controller: Advanced Micro Devices, Inc. [AMD] FCH SATA Controller [AHCI mode] (rev 51)
0a:00.3 Audio device: Advanced Micro Devices, Inc. [AMD] Family 17h (Models 00h-0fh) HD Audio Controller

Yup that’s what I meant!

Your issue seems a bit like this bug, which revolves around issues with flickering at above 60Hz. There are some workarounds in the comments, but nothing really guaranteed to work. Therefore, I’d say your best bet is just to set it to 60 on boot automatically.

How did you change it to 60 in this case for testing? You should be able to make it a permanent setting via the Display section of the Settings app.

1 Like

Sure, the flickering in the bug is exactly what I’ve got! Anyway if 60Hz would solve the problem, image quality is still bad and I have no idea how to fix it.

I changed it via Display settings but it didn’t went permanent for boot and other users (for example root user has 75Hz). I’ve tried to change it on root, but login screen on startup keeps running in 75Hz and keeps flickering.
Is the problem in drivers for the video card? If I change it, could it solve the problem? If it would, so could you advice me how to choose a video card with good Linux compatibility

Hmm we could try forcibly using 60hz, but this is quite interesting as well. Could you describe a bit more about the quality issues?

At a glance, this problem seems to be somehow related to the monitor as well, freesync monitors in particular.

In order of difficulty, I’ve general seen NVIDIA -> AMD -> Intel. That being said, AMD does still have some rough edges (as you can see), since it’s more recently-ish that they’ve picked up maintaining the in-tree kernel driver.