FS#49431 - [linux] 4.6 slows down qt5 apps

Attached to Project: Arch Linux
Opened by Gaetan Bisson (vesath) - Saturday, 21 May 2016, 23:06 GMT
Last edited by Gaetan Bisson (vesath) - Wednesday, 08 June 2016, 19:28 GMT
Task Type Bug Report
Category Packages: Testing
Status Closed
Assigned To Tobias Powalowski (tpowa)
Architecture All
Severity Low
Priority Normal
Reported Version
Due in Version Undecided
Due Date Undecided
Percent Complete 100%
Votes 2
Private No

Details

After upgrading to linux-4.6, qt5 apps become terribly slow.

Something like subsurface where normally scrolling from one dive to the next is near instantaneous now takes a few seconds to respond to each keystroke. With qt5-webkit, when I type in a text field on any web page (such as Arch's bug tracker), the letters I type take several seconds to appear. I could go on but you get the picture.

Reverting to linux-4.5.4 fixes this issue.

I have no idea how to debug this; this bug report is for now intended to prevent linux-4.6 from moving to [core].
This task depends upon

Closed by  Gaetan Bisson (vesath)
Wednesday, 08 June 2016, 19:28 GMT
Reason for closing:  Duplicate
Additional comments about closing:   FS#49623 
Comment by Gaetan Bisson (vesath) - Saturday, 21 May 2016, 23:15 GMT
I see nothing really suspicious in the logs (attached). It might just be the new i915 module that's buggy.
   dmesg.bad (63.9 KiB)
   dmesg.good (63.3 KiB)
   xorg.bad (23.9 KiB)
   xorg.good (23.9 KiB)
Comment by patrick (potomac) - Sunday, 22 May 2016, 04:09 GMT
probably a problem with your graphic card driver, if it's the case you may also have problems with openGL applications,

you can confirm that by using a generic driver ( vga ) or test with a virtual machine ( virtualbox, qemu )
Comment by Gaetan Bisson (vesath) - Thursday, 02 June 2016, 08:40 GMT
I'm still experiencing this issue with 4.6.1.
Comment by Gaetan Bisson (vesath) - Thursday, 02 June 2016, 20:01 GMT
Still not working with 4.6.1-2. I'll try bisecting this later today.
Comment by Gaetan Bisson (vesath) - Wednesday, 08 June 2016, 19:28 GMT
Apparently there is not much interest in bug reports for [testing] packages, so I'm closing this one and letting Tobias deal with the same bug in [core].

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