Bug 1217882 - Kernel 5.14.21-150400.24.97 don't support external monitor (i915 with HDMI)
Summary: Kernel 5.14.21-150400.24.97 don't support external monitor (i915 with HDMI)
Status: RESOLVED WORKSFORME
Alias: None
Product: openSUSE Distribution
Classification: openSUSE
Component: Kernel (show other bugs)
Version: Leap 15.4
Hardware: x86-64 openSUSE Leap 15.4
: P5 - None : Normal (vote)
Target Milestone: ---
Assignee: openSUSE Kernel Bugs
QA Contact: E-mail List
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Reported: 2023-12-07 14:00 UTC by Peter Küppers
Modified: 2023-12-11 10:49 UTC (History)
2 users (show)

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Description Peter Küppers 2023-12-07 14:00:55 UTC 
After upgrading to kernel 5.14.21-150400.24.97 (kernel-default) my external monitor was no longer detected or available.
somewhere recommended kernel parameter i915.force_probe didn't help
switching back to kernel 5.14.21-150400.24.88 helped

hwinfo --gfxcard
  Hardware Class: graphics card
  Model: "Intel 2nd Generation Core Processor Family Integrated Graphics Controller"
  Vendor: pci 0x8086 "Intel Corporation"
  Device: pci 0x0126 "2nd Generation Core Processor Family Integrated Graphics 
  Driver Modules: "i915"
  Driver Status: i915 is active
xrandr --listmonitors
Monitors: 2
 0: +*HDMI1 1920/530x1080/300+0+0  HDMI1
 1: +LVDS1 1280/260x800/160+0+0  LVDS1
(with kernel 5.14.21-150400.24.97 HDMI1 was missing)
Comment 1 Takashi Iwai 2023-12-07 16:12:18 UTC 
Could you boot with "drm.debug=0x1e log_buf_len=16M" boot options for both working and non-working cases, and attach the outputs of dmesg to Bugzilla?
You can compress the files before uploading.
Comment 2 Peter Küppers 2023-12-11 10:49:20 UTC 
Hello Takashi,

sorry for the late answer, but Bugzilla login was not available for some days (LDAP error).

But the good news:
I don't know what I changed, which was relevant after I committed the bug. But it works now with the kernel 5.14.21-150400.24.97.

I have the following kernels and related rpm installed (from standard 15.4 repository):
5.14.21-150400.24.88
5.14.21-150400.24.92
5.14.21-150400.24.97
Means for every kernel the package:
kernel-default
kernel-default-extra
kernel-default-optional
And I 'juggled' with the kernel-macros package between the versions and used YaST Bootloader module in between changing default kernel.

Now it works and I've no idea, what was the reason for this. 
If it happens again, I'll have a closer look on the constellation.
Please let me know, if you need further information. Will put the bug status to RESOLVED - WORKSFORME.

Thank's a lot fot your help!

Peter