Bug 1397303

Summary: Intel NUC dead console i915 modeset
Product: [Fedora] Fedora Reporter: Jon <unheiliger>
Component: xorg-x11-drv-intelAssignee: Adam Jackson <ajax>
Status: CLOSED EOL QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: medium Docs Contact:
Priority: unspecified    
Version: 25CC: ajax, cz172638, gansalmon, ichavero, itamar, jonathan, kernel-maint, labbott, madhu.chinakonda, mchehab, xgl-maint
Target Milestone: ---   
Target Release: ---   
Hardware: x86_64   
OS: Linux   
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Last Closed: 2017-12-12 10:27:11 UTC Type: Bug
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description Flags
Requested files for debugging none

Description Jon 2016-11-22 09:06:14 UTC
Description of problem:
After the Fedora 24 => 25 update, the desktop does not display


Version-Release number of selected component (if applicable):


How reproducible:
Every time: Make update from fedora 24 to 25 (dnf system-upgrade) with an i915 chipset.

Steps to Reproduce:
1. Check you have an i915 chipset (e.g. NUC6i7KYB)
2. Use dnf-system-upgrade from fedora 24 to fedora 25
3. Wait for the reboot.

Actual results:
Black screen

Expected results:
Desktop login

Additional info:
As a work around, setting "i915.modeset=0" brings up the desk top. With Fedora 24 this was not required. This work around is also required on RHEL7 on this HW, so it looks like a backward step.

This is from the Xorg logs:

Successful start:
[root@xyz log]# grep i915 Xorg.0.log
[     5.395] Kernel command line: BOOT_IMAGE=/vmlinuz-4.8.8-300.fc25.x86_64 root=/dev/mapper/fedora-root ro i915.modeset=0 rd.lvm.lv=fedora/root rd.lvm.lv=fedora/swap rhgb quiet
        915G, E7221 (i915), 915GM, 945G, 945GM, 945GME, Pineview GM,

Unsuccessful start:
[root@xyz log]# grep i915 Xorg.1.log
        915G, E7221 (i915), 915GM, 945G, 945GM, 945GME, Pineview GM,

From /var/log/messages, I only get this during an unsuccessful start:

Nov 22 09:09:48 xyz kernel: [drm] Initialized i915 1.6.0 20160711 for 0000:00:02.0 on minor 0
Nov 22 09:09:48 xyz kernel: i915 0000:00:02.0: No connectors reported connected with modes
Nov 22 09:09:48 xyz kernel: i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
Nov 22 09:09:49 xyz kernel: snd_hda_intel 0000:00:1f.3: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915])

During a successful start (i915.modeset=0) there are no i915 DRM messages (but that's not really surprising).

If you need more, I can reboot without the i915 disabled and SSH in to get the logs, however it is my work workstation, so please don't expect rapid responses :-)

Comment 1 Nicolas Chauvet (kwizart) 2016-11-22 09:13:12 UTC
This is the wrong component, re-assigned.
Please provide information as described in this wiki:
https://fedoraproject.org/wiki/How_to_debug_Xorg_problems

Comment 2 Jon 2016-11-22 22:28:22 UTC
Thank you for assigning this to xorg-x11-drv-intel.
I am attaching the requested information as per the Xorg debug wiki page.
One thing to note, whilst generating the snapshot file, the system became unresponsive, and then spontaneously rebooted.

This seems to be a problem with detecting the screens. The NUC in question has a mini-displayport connector and an HDMI port. The two connected screens are daisy chained to the mini DP.

I have previously noted that the HDMI port is detected as a DP on the Intel NUCs I have used, which may be problematic?

Thank you for the attention to this.

Comment 3 Jon 2016-11-22 22:30:57 UTC
Created attachment 1222896 [details]
Requested files for debugging

The snapshot file may not be complete. The system rebooted during generation, repeatedly.

Comment 4 Jon 2016-11-24 09:07:05 UTC
This bug may be related: 1338026

Comment 5 Fedora End Of Life 2017-11-16 19:18:34 UTC
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Comment 6 Fedora End Of Life 2017-12-12 10:27:11 UTC
Fedora 25 changed to end-of-life (EOL) status on 2017-12-12. Fedora 25 is
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