kernel-packages team mailing list archive

[macolu <ubuntu@xxxxxxxxxx>]

Public bug reported:

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

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: xenial

** Description changed:

  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 screens (one HDMI, one VGA). I correctly see desktop on three monitors.
+ * 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)
  * Dock laptop again. Laptop is freezed.
  
  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% reproductible, so I can provide more information if
  you tell me what to add :-)
  
  Thanks

** Description changed:

  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)
+ * Undock laptop. Screen is correctly resized (however, Plasma stills crashes, but this is maybe off topic here)
  * Dock laptop again. Laptop is freezed.
  
  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% reproductible, so I can provide more information if
  you tell me what to add :-)
  
  Thanks

** Description changed:

  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 freezed.
+ * 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% reproductible, so I can provide more information if
- you tell me what to add :-)
+ The issue is 100% reproducible, so I can provide more information if you
+ tell me what to add :-)
  
  Thanks

-- 
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1565924

Title:
  [Xenial] Freeze when docking Laptop

Status in linux package in Ubuntu:
  New

Bug description:
  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

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1565924/+subscriptions