[Bug 100351] New: System freezes for 2 seconds while opening apps

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=100351

            Bug ID: 100351
           Summary: System freezes for 2 seconds while opening apps
           Product: Drivers
           Version: 2.5
    Kernel Version: 4.0.5-300.fc22.x86_64
          Hardware: x86-64
                OS: Linux
              Tree: Fedora
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri at kernel-bugs.osdl.org
          Reporter: yaroslav.sapozhnik at gmail.com
        Regression: No

Every time I open KDE app, the system freezes for 2 seconds. 

It has 2 graphic cards:
00:02.0 VGA compatible controller: Intel Corporation 4th Gen Core Processor
Integrated Graphics Controller (rev 06)
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Mars
XTX [Radeon HD 8790M] (rev ff)

In the logs I see:
Jun 22 17:33:25 terminus kernel: [drm] probing gen 2 caps for device 8086:c01 =
261ad03/e
Jun 22 17:33:25 terminus kernel: [drm] PCIE gen 3 link speeds already enabled
Jun 22 17:33:25 terminus kernel: [drm] PCIE GART of 1024M enabled (table at
0x0000000000277000).
Jun 22 17:33:25 terminus kernel: radeon 0000:01:00.0: WB enabled
Jun 22 17:33:25 terminus kernel: radeon 0000:01:00.0: fence driver on ring 0
use gpu addr 0x0000000080000c00 and cpu addr 0xffff88041697cc00
Jun 22 17:33:25 terminus kernel: radeon 0000:01:00.0: fence driver on ring 1
use gpu addr 0x0000000080000c04 and cpu addr 0xffff88041697cc04
Jun 22 17:33:25 terminus kernel: radeon 0000:01:00.0: fence driver on ring 2
use gpu addr 0x0000000080000c08 and cpu addr 0xffff88041697cc08
Jun 22 17:33:25 terminus kernel: radeon 0000:01:00.0: fence driver on ring 3
use gpu addr 0x0000000080000c0c and cpu addr 0xffff88041697cc0c
Jun 22 17:33:25 terminus kernel: radeon 0000:01:00.0: fence driver on ring 4
use gpu addr 0x0000000080000c10 and cpu addr 0xffff88041697cc10
Jun 22 17:33:25 terminus kernel: radeon 0000:01:00.0: fence driver on ring 5
use gpu addr 0x0000000000075a18 and cpu addr 0xffffc900060b5a18
Jun 22 17:33:25 terminus kernel: [drm] ring test on 0 succeeded in 2 usecs
Jun 22 17:33:25 terminus kernel: [drm] ring test on 1 succeeded in 1 usecs
Jun 22 17:33:25 terminus kernel: [drm] ring test on 2 succeeded in 1 usecs
Jun 22 17:33:25 terminus kernel: [drm] ring test on 3 succeeded in 3 usecs
Jun 22 17:33:25 terminus kernel: [drm] ring test on 4 succeeded in 3 usecs
Jun 22 17:33:25 terminus kernel: [drm] ring test on 5 succeeded in 2 usecs
Jun 22 17:33:25 terminus kernel: [drm] UVD initialized successfully.
Jun 22 17:33:25 terminus kernel: [drm] ib test on ring 0 succeeded in 0 usecs
Jun 22 17:33:25 terminus kernel: [drm] ib test on ring 1 succeeded in 0 usecs
Jun 22 17:33:25 terminus kernel: [drm] ib test on ring 2 succeeded in 0 usecs   
Jun 22 17:33:25 terminus kernel: [drm] ib test on ring 3 succeeded in 0 usecs   
Jun 22 17:33:25 terminus kernel: [drm] ib test on ring 4 succeeded in 0 usecs   
Jun 22 17:33:26 terminus kernel: [drm] ib test on ring 5 succeeded

The strange thing is that the "xrandr --listproviders" shows radeon provider
twice:

Providers: number : 3
Provider 0: id: 0x7e cap: 0xb, Source Output, Sink Output, Sink Offload crtcs:
4 outputs: 8 associated providers: 2 name:Intel
Provider 1: id: 0x52 cap: 0xf, Source Output, Sink Output, Source Offload, Sink
Offload crtcs: 2 outputs: 1 associated providers: 2 name:radeon
Provider 2: id: 0x52 cap: 0xf, Source Output, Sink Output, Source Offload, Sink
Offload crtcs: 2 outputs: 1 associated providers: 2 name:radeon

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