Issues with Ubuntu 16.04.2 with kernel 4.8

mlukaszek · 02-17-2017, 03:06 PM

I smell some problems with USB on your machine or maybe the connection of the dock to the laptop.

If you inspect the dmesg of the most recent attachment, it's full of:
[ 108.450644] usb 4-1-port4: Cannot enable. Maybe the USB cable is bad?

Cheers,
Michal

giuliocoluccia · 02-17-2017, 03:59 PM

I don't think so... the cable is the same I used with the old kernel. Moreover, the docking station has working usb ports, audio outputs and LAN...

giuliocoluccia · 02-20-2017, 09:00 AM

I'm more and more convinced that this is a software issue. I've tried to connect my docking station to another pc not upgraded to kernel 4.8. No errors in the syslog related to the cable. Then I've plugged it again to my laptop and the monitor woke up. No errors in the syslog related to the cable. But still unusable (very slow, high cpu usage by DisplayLink server). I attach the report of the Support Tool.

mlukaszek · 02-21-2017, 02:13 PM

I am trying to get my head around it

Could you please clarify one thing: do I read correctly that this happens when you close the laptop lid (so the built-in screen is off)?
If yes, is the same problem visible when you keep the lid open (and do not disable the built-in screen)?

Cheers,
Michal

giuliocoluccia · 02-21-2017, 03:23 PM

This is what it looked in the first place. I tried again this morning (the kernel updated, I hoped this was fixed) and it seems that the problem arises just connecting the external monitor, no matter if the lid is on or off. The problem is significantly amplified when I open Google Chorme, which is unusable. If I unplug the external monitor or I connect it with the displayport, everything works fine.

giuliocoluccia · 02-22-2017, 08:26 AM

Let mi know it there's any test I can run to help you understand. Thank you!
I hoped that this morning's update of kernel and hardware enablement stack could fix the issue but still no luck. I attach the report of the support tool.

jerrinot · 02-27-2017, 10:41 AM

Hello,

I'm also running Ubuntu 16.04.2 with the 4.8 kernel and I'm experiencing massive slowdown as well. I tried to upgrade the driver to the version 1.3.52, but it made no observable difference. Chrome is really unusable, even gedit is super slow.

I believe I was on 4.8 kernel even before and it worked fine. The slowdown happened when I enabled the full Ubuntu HWE stack and Xorg got upgraded to a newer version.

glxgears reports 1 FPS when I move the window to a display connected via DisplayLink. Unfortunatekly I don't know FPS before the HWE upgrade.

02-27-2017, 10:41 AM	#7
jerrinot Junior Member Join Date: Feb 2017 Posts: 3	Same problem on Thinpad T540p Hello, I'm also running Ubuntu 16.04.2 with the 4.8 kernel and I'm experiencing massive slowdown as well. I tried to upgrade the driver to the version 1.3.52, but it made no observable difference. Chrome is really unusable, even gedit is super slow. I believe I was on 4.8 kernel even before and it worked fine. The slowdown happened when I enabled the full Ubuntu HWE stack and Xorg got upgraded to a newer version. glxgears reports 1 FPS when I move the window to a display connected via DisplayLink. Unfortunatekly I don't know FPS before the HWE upgrade.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Display Modes
Switch to Linear Mode Hybrid Mode Switch to Threaded Mode

02-17-2017, 03:06 PM	#1
mlukaszek Senior Member Join Date: Feb 2010 Posts: 386	I smell some problems with USB on your machine or maybe the connection of the dock to the laptop. If you inspect the dmesg of the most recent attachment, it's full of: [ 108.450644] usb 4-1-port4: Cannot enable. Maybe the USB cable is bad? Cheers, Michal

02-17-2017, 03:59 PM	#2
giuliocoluccia Junior Member Join Date: Dec 2015 Posts: 21	I don't think so... the cable is the same I used with the old kernel. Moreover, the docking station has working usb ports, audio outputs and LAN...

02-21-2017, 02:13 PM	#4
mlukaszek Senior Member Join Date: Feb 2010 Posts: 386	I am trying to get my head around it Could you please clarify one thing: do I read correctly that this happens when you close the laptop lid (so the built-in screen is off)? If yes, is the same problem visible when you keep the lid open (and do not disable the built-in screen)? Cheers, Michal

02-21-2017, 03:23 PM	#5
giuliocoluccia Junior Member Join Date: Dec 2015 Posts: 21	This is what it looked in the first place. I tried again this morning (the kernel updated, I hoped this was fixed) and it seems that the problem arises just connecting the external monitor, no matter if the lid is on or off. The problem is significantly amplified when I open Google Chorme, which is unusable. If I unplug the external monitor or I connect it with the displayport, everything works fine.