I use Displayport for connecting my display to my desktop computer. There were no problems when using the 6.6 kernel, but when I installed the first available 6.7 kernel and tried booting I could not see anything after the motherboard boot logo, only a black screen. I tried rebooting from the black screen using the computer case buttons which made the GRUB kernel selection screen visible, but as soon as I select a 6.7 kernel there is only a black screen. If I reboot and select the last 6.6 kernel everything works as usual.
After some troubleshooting I noticed that if I use HDMI instead of Displayport I can boot into the 6.7 kernels as well and everything seems to work normally. If I try switching to Displayport while logged in the black screen reappears until I switch back to HDMI.
How can I fix this? I need to use Displayport since the high refresh rates I use are unsupported by my hardware through HDMI.
Some specs: Fedora 39, KDE spin, all latest updates installed, Intel 12600K CPU with UHD 770 integrated graphics for the monitor
I suspect you really mean want and not need.
Using ‘need’ tends to imply you have no choice, while ‘want’ indicates a preference. You just said that you can use hdmi instead of DP so that implies a preference.
You did not give us any information about the hardware, nor up to date details about the OS.
Please post the output of xrandr and inxi -Fzxx so we may see more details of the hardware and software installed. Use the </> button on the toolbar to retain the formatting you see on your screen and keep it more readable for us so we may assist in troubleshooting.
Correct, I mean that I want to use Displayport since HDMI gives me an inferior experience. I apologize if it was unclear, English is not my native language.
Here is the output of inxi -Fzxx using the 6.6.14 kernel that works correctly. I replaced the LUKS ID at mapped on partition ID-1 and ID-4 with xxx since I do not know if this is sensitive information or not (probably not, but better safe than sorry):
The xrandr output seems to indicate that you are using 3840x2160 resolution at 144 Hz. The inxi output though shows 1920x1080 resolution
Both indicate using DP output.
Have you used the kde settings → display panel to check the actual config that is set for that monitor? The inconsistency in reported resolution may be a result of not properly setting up the display in settings.
Have you verified the refresh rate for the monitor?
My laptop works very well with a refresh at 144 Hz even when I have an external monitor attached with 60 Hz refresh.
xrandr is correct, I am using 3840x2160 at 144 Hz. inxi is incorrect (though I assume you mean 1920, not 1960), I am not using (and have never used) that resolution.
Correct, as I previously mentioned I want to use DP since HDMI does not give me the refresh rate I want, HDMI only gives me 3840x2160 at 60 Hz. This is in fact what happens when I boot a 6.7 kernel using HDMI.
I assume you mean the settings in KDE, not Gnome. If I go to Display and Monitor in System Settings, I see the correct name of the monitor and the correct values of 3840x2160 at 144 Hz. If I do the same using HDMI and kernel 6.7, I instead see 3840x2160 at 60 Hz as expected (and I cannot change it to higher than 60 Hz since my hardware does not support it).
I am 100 percent sure that the monitor is currently (and has always been) operating at 144 Hz on DP. However, I have not formally verified this using a specific method if that is what you mean. If you think this is needed to troubleshoot my problem I can certainly do so, please tell me how in that case.
I have only one display attached and it has always used 3840x2160 at 144 Hz through DP before kernel 6.7.
This sounds like it may be a limitation of the hdmi interface and not the software. You see the monitor at 144 Hz with DP but only at 60 Hz with HDMI. An interface can never perform better than its physical limitations.
If I understand your dilemma properly it seems that hdmi may have previously functioned at 144 Hz, but now only functions at 60 Hz. Is that correct?
If so then this may be a regression in the kernel or drivers and possibly should be reported as such with a bug report at bugzilla.redhat.com
Yes, as I previously mentioned, my hardware does not support the high refresh rate I use through HDMI. That is why I use DP since it works with 144 Hz.
No, that is incorrect. HDMI has always only functioned at 60 Hz (or lower) using 3840x2160. That is the reason why I have not used HDMI before, only now for troubleshooting. My problem is that DP does not work at all after installing kernel 6.7, now I only get a black screen after the motherboard boot logo, nothing else (except for the GRUB kernel selection screen if I reboot). The only functioning way to boot into Fedora using DP is to use the last 6.6 kernel I still have, otherwise if I use a 6.7 kernel I can only use HDMI. As I only get 60 Hz from HDMI it is not a good solution since I want to use 144 Hz which is only supported by DP on my hardware. In summary: Using kernel 6.6 and earlier, DP works as expected. Using kernel 6.7, DP does not work.
If it worked as expected with the 6.6 kernel and does not work the same with the 6.7 kernel then I definitely recommend that you file a bug report due to the regression.