Bug 2013140

Created attachment 1832129 [details]
Detect result

1. Please describe the problem:
I have Fedora 34 installed on my notebook, HP 14-ck0023TU. But Fedora cannot detect external extra-wide 29" monitor, LG 29WK600-W. 
And the problems are as follows: 
1.1 Fedora identified it as LG Electonics 34".
1.2 Fedora cant make this external monitor the "Single Display".
1.3 On The "Joined Display", there will be blackout on both monitors after the screen lock. The notebook must be switched off and on again by the power button.

2. What is the Version-Release number of the kernel:
fedora002@fedora 
         .';:cccccccccccc:;,.            ---------------- 
      .;cccccccccccccccccccccc;.         OS: Fedora 34 (Workstation Edition) x8 
    .:cccccccccccccccccccccccccc:.       Host: HP Laptop 14-ck0xxx 
  .;ccccccccccccc;.:dddl:.;ccccccc;.     Kernel: 5.14.10-200.fc34.x86_64 
 .:ccccccccccccc;OWMKOOXMWd;ccccccc:.    Uptime: 1 hour, 39 mins 
.:ccccccccccccc;KMMc;cc;xMMc:ccccccc:.   Packages: 1936 (rpm) 
,cccccccccccccc;MMM.;cc;;WW::cccccccc,   Shell: bash 5.1.0 
:cccccccccccccc;MMM.;cccccccccccccccc:   Resolution: 1366x768 
:ccccccc;oxOOOo;MMM0OOk.;cccccccccccc:   DE: GNOME 40.4 
cccccc:0MMKxdd:;MMMkddc.;cccccccccccc;   WM: Mutter 
ccccc:XM0';cccc;MMM.;cccccccccccccccc'   WM Theme: Adwaita 
ccccc;MMo;ccccc;MMW.;ccccccccccccccc;    Theme: Adwaita [GTK2/3] 
ccccc;0MNc.ccc.xMMd:ccccccccccccccc;     Icons: Adwaita [GTK2/3] 
cccccc;dNMWXXXWM0::cccccccccccccc:,      Terminal: gnome-terminal 
cccccccc;.:odl:.;cccccccccccccc:,.       CPU: Intel Pentium Silver N5000 (4) @  
:cccccccccccccccccccccccccccc:'.         GPU: Intel GeminiLake [UHD Graphics 60 
.:cccccccccccccccccccccc:;,..            Memory: 1825MiB / 7702MiB 
  '::cccccccccccccc::;,.




3. Did it work previously in Fedora? If so, what kernel version did the issue
   *first* appear?  Old kernels are available for download at
   https://koji.fedoraproject.org/koji/packageinfo?packageID=8 :
I have replaced the external monitor, SAMSUNG LS24F350FHEXXT, with LG as mentioned above. There is no problem on that SAMSUNG monitor running on the same kernel as mentioned in #2.

4. Can you reproduce this issue? If so, please provide the steps to reproduce
   the issue below:
4.1 Before switching on the notebook, attach the monitor to the notebook on HDMI port.
4.2 Switching on the notebook and it boot Fedora 34.
4.3 On "Settings" > "Displays", Fedora identifies it as " LG Electornics 34" "
4.3 The resolution is correct, 2560 x 1080 (IPS/HDR).
4.4 The speakers on the LG external monitor work well.  

5. Does this problem occur with the latest Rawhide kernel? To install the
   Rawhide kernel, run ``sudo dnf install fedora-repos-rawhide`` followed by
   ``sudo dnf update --enablerepo=rawhide kernel``:
Sorry, I have no dare to do that for I am just an ordinary user. I have to report for nobody answers my question on Ask Fedora, https://ask.fedoraproject.org/t/blank-screen-after-screen-locked-and-no-response/17151 .

6. Are you running any modules that not shipped with directly Fedora's kernel?:
Never.

7. Please attach the kernel logs. You can get the complete kernel log for a boot with ``journalctl --no-hostname -k > dmesg.txt``. 
If the issue occurred on a previous boot, use the journalctl ``-b`` flag.
Sorry, I have no dare to do that.