[Xenial] Freeze when docking Laptop

[macolu]

Hi

I just upgraded from Kubuntu 15.10 to 16.04, to see if crashes related to screen layout changes have been fixed in Plasma 5.5.

I'm not sure whether the situation really improved. However, I experience a freeze when docking laptop. I didn't experience it on 15.10.

How to reproduce:
* Start laptop docked. On the dock, I have two monitors (one HDMI, one VGA). I correctly see desktop on three monitors.
* Undock laptop. Screen is correctly resized (however, Plasma stills crashes, but this is maybe off topic here)
* Dock laptop again. Laptop is frozen.

Freeze happen with default kernel linux-image-4.4.0-16-generic.
However, I don't reproduce the freeze with linux-image-4.4.0-040400-generic (from kernel-ppa, installed before Xenial upgrade).

Hardware is Dell Latitude E7450
Integrated Graphics Chipset: Intel(R) HD Graphics 5500

I tried to see content of various logs when freeze happen, but I didn't see anything relevant:

tail -f /var/log/kern.log
journalctl -f

The issue is 100% reproducible, so I can provide more information if you tell me what to add :-)

Thanks

[Brad Figg (brad-figg)]

This bug is missing log files that will aid in diagnosing the problem. From a terminal window please run:

apport-collect 1565924

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[macolu (f-ubuntu-g)]

Just ran apport-collect command above. Result is :"No additional information collected."

[Joseph Salisbury (jsalisbury)]

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.6 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.6-rc2-wily/

[macolu (f-ubuntu-g)]

I tested several mainline kernel versions.

* 4.4: bug is not present
* 4.5: bug is present
* 4.6rc1 and 4.6rc2: bug is present. I also encountered a serious blinking issue that I'll have to report separately.

Thanks

[Nick G (nick--g)]

Also affected by these issues

I upgraded from 15.10 (clean install) -> 16.04

Hardware:
Dell Latitude 7450 (Intel Core i7-5600U 2.6 GHz, 8 GB RAM, 256 GB SSD, 1080p screen, Intel Graphics)
Dell Dock: E-DOCK PORT REPLICATOR PR03X

Currently on Kernel: 4.4.6-040406-generic (was on 4.4.2 after upgrading to 16.04, Kernel upgrade didn't fix anything)

Since the upgrade to 16.04:
*Laptop intermittently freezes and a hardware crash happens when using Dell dock (motherboard light flashing on capslocks key / screen goes blank)
*Laptop now intermittently freezes on high CPU (I sometimes run a windows 8 VM in virtualbox. Now the laptop will freeze as above (blinking light) if i start the VM while the CPU is already under load with chrome/something
*2nd display in dual monitor extended config is flashing after standby - this wasnt happening in 15.10

please let me know if you need further info, 16.04 seems like a decent OS bar these issues.

[Dhakir (dhakir)]

I have a similar bug, but on a different hardware, and I'd like to confirm if it is the same bug, or if I should open a new bug.

Hardware: Lenovo T440p with Ultradock, i7-4810MQ, external monitor connected to dock by DVI.
How to reproduce:
- Boot with docked laptop. After boot, external monitor is detected and becomes only active display (as per my configuration).
- Undock laptop. Laptop screen automatically turned on and desktop resized as expected.
- Re-dock laptop. Laptop screen becomes black, external monitor receives no signal, and keyboard no longer responds, nothing (Ctrl+Alt+F1 does not work, keyboard Num Lock no longer changes, etc.). Only solution is to reboot via power button.

I previously used Ubuntu 14.04 on same dock, and just recently Xubuntu 16.04, both without problems (re-docking worked fine).

I will test a newer kernel, but because of the freeze, I'm not sure how to get extra information about it.

[saman (eskandarzadeh)]

Hi,

I have the same problem. I recently installed ubuntu 16.04 on my laptop e5570. I use dell dock pr03x. When i turn on the laptop, usually the keyboard and mouse do not work. The external monitor sometimes freezes. Anybody has any ideas how i can solve this.

best

[Mitchell Quinn (mouchy)]

Having similar issue. Two laptops both dells slightly different models. Both using Dell E-Port Plus.

First laptop upgraded from 14.04 -> 16.04 and no issue at all.

Second laptop fresh install of 16.04. Any time I un-dock/re-dock the major freeze occurs. Only thing I can do is hardboot the laptop. Also noticing some tearing and flickering.

[madbiologist (me-again)]

Does this command print any output?

lspci -vvnn |grep 0bda:8153

[Mitchell Quinn (mouchy)]

@madbiologist : No output.

Would the full output of lspci -vvnn be helpful?

[madbiologist (me-again)]

I was wondering if you were affected by a bug which has recently been fixed, but you have different hardware. You could post the full output anyway in the hope it might help someone else to assist you.

[Launchpad Janitor (janitor)]

[Expired for Ubuntu because there has been no activity for 60 days.]