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Tasklist

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.
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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