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Laptop running Fedora 28 will not boot when docked.

asked 2018-02-08 09:10:37 -0500

NJ_Mahwah gravatar image

updated 2018-05-08 14:50:23 -0500

I run a Lenovo P50 laptop. I was able to boot when docked with 2 external displays using kernel 4.13.16-302,..however, when I upgraded to 4.14.14-300 kernel the laptop will not boot when docked. It just freezes showing 3 side by side squares. These squares will each light up in sequence but freezes on the third square. If undocked, it will boot with no issues.

I also upgraded to 4.14.16-300 and same issue.

However, if I boot docked and select kernel 4.13.16-302 I'm back in business. I also ran fedora 26 on this same laptop with no issues.

Any ideas?

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Do you get the squares on the working kernel or do you get the Fedora logo then? That could indicate a graphics problem. Possibly the dock involves a different graphics chipset.

Try editing the boot entry in grub before you start it. Remove the "rhgb" and "quiet" from the end of the kernel command line. That will let you see more about where it's getting stuck. You can also just press the ESC key once the squares show up and that will give you a bit more info.

ssieb gravatar imagessieb ( 2018-02-08 14:11:46 -0500 )edit

Thanks Samuel. No, I don't get the Fedora logo, it just hangs on the 3rd square. I'm glad you asked about hitting Esc at that point,....I had forgotten to mention.

Interestingly enough, if I boot to kernel 4.13.16-302 while docked, I don't get the Fedora screen,..it just goes straight to login screen. When it's stuck on the 3rd square, and I hit Esc, I get a blank screen. I'll try editing the grub as suggested, but it's going to have to wait until Monday.

NJ_Mahwah gravatar imageNJ_Mahwah ( 2018-02-09 06:39:27 -0500 )edit

I edited grub to comment out "rhgb" and "quiet" After reboot,...it doesn't appear to show anything new to help understand why it's hanging.

All while docked: If I boot to kernel 4.14.16-300, it just immediately hangs. If I boot to kernel 4.14.14-300, I get the screen with the 3 boxes and it hangs on the 3rd box. If I boot to kernel 4.13.16-302, it goes straight to login screen and I can login.

NJ_Mahwah gravatar imageNJ_Mahwah ( 2018-02-12 08:16:47 -0500 )edit

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answered 2018-02-12 12:45:06 -0500

NJ_Mahwah gravatar image

Well, problem solved. That is to say, I can login using the latest kernel while docked and with two external monitors.

Solution: Changed the bios setting for Display from Discreet to Hybrid.

Oddly enough, I had a similar problem a few months ago and changing it to Discreet resolved the problem. Totally forgot until I reviewed some notes. Why the flip-flop? No clue,..but at least I'm working now.

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Well, I'm back to this laptop not booting when docked with two external displays. I had updated to the latest kernel a few weeks ago and the issue seemed ot have crept back in.

Same problem as originally described above, so I won't repeat. Today, nothing I did allowed me to boot when docked. Also tried booting when undocked, but when I try to dock, it locks up.

I even upgraded to Fedora 28 this morning and nadda, nuttin, fubar. I can boot undocked, but the laptop will not boot when docked.

NJ_Mahwah gravatar imageNJ_Mahwah ( 2018-05-08 14:48:16 -0500 )edit

I am also having this, amung other problems related to the docking station with Fedora 28 (KDE), on my T470.

himmallright gravatar imagehimmallright ( 2018-05-11 06:58:36 -0500 )edit
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answered 2018-02-09 10:38:32 -0500

rhandwor52 gravatar image

I have kernel problems and downloaded 4-14-18 kernel debug. Then when rebooting in a couple days I get a notice to reboot and install important updates. I do this and the problem is usually fixed. I log in as SU then run dnf update --enablerepo=updates-testing. After new kernel is installed use dnf install kernel number debug. You can also google fedora 27 debug kernel and download from a repository.

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If you're inferring that I should install a debug version of kernel,...well sorry, but that's just silly. I have no problems doing something like that if it means helping troubleshoot an issue,...but as a solution, come on. Besides,...I'm not the only one experiencing this issue.

NJ_Mahwah gravatar imageNJ_Mahwah ( 2018-02-12 07:29:39 -0500 )edit

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Asked: 2018-02-08 09:10:37 -0500

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Last updated: May 08 '18