[Bug 99457] New: Excessive CPU load by the xorg-server and GUI's hard lags

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99457

            Bug ID: 99457
           Summary: Excessive CPU load by the xorg-server and GUI's hard
                    lags
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
          Assignee: xorg-driver-ati at lists.x.org
          Reporter: eshkrig at gmail.com
        QA Contact: xorg-team at lists.x.org

Created attachment 129041
  --> https://bugs.freedesktop.org/attachment.cgi?id=129041&action=edit
Xorg.0.log, /proc/cpuinfo, output of dmesg, lspci, dmidecode

Hi!
Sorry for my English.

I use vnc xorg-module for remote support users.

In September 2016 I have updated xorg-server, tigervnc, xf86-video-ati and
related packages.

Packages versions before updating:
xorg-server-1.17.4
xf86-video-ati-7.5.0
tigervnc-1.4.2-r2

Packages versions after updating:
xorg-server-1.18.4
xf86-video-ati-7.7.0
tigervnc-1.6.0-r2

I faced the problem of excessive CPU load by the xorg-server and GUI's hard
lags.
I found that disabling vnc module in xorg.conf eliminates the problem.

The problem occurs only with video cards AMD.

I recently noticed that the problem only occurs when monitor connected via DVI.
When monitor connected through VGA everything works as it should.

To date, kernel version 4.4.39, but different versions 4.4.6 - 4.4.39 have no
effect on the problem.
I tried version xf86-video-ati-7.8.0 and tigervnc-1.7.0 - the problem persists.

Distribution - Gentoo
The attachment files Xorg.0.log, /proc/cpuinfo, output of dmesg, lspci,
dmidecode.

There is a bug report for tigervnc:
https://github.com/TigerVNC/tigervnc/issues/401

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