[Bug 108706] New: X slow rendering performance with i915 driver

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=108706

            Bug ID: 108706
           Summary: X slow rendering performance with i915 driver
           Product: xorg
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: undying.k at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Created attachment 142426
  --> https://bugs.freedesktop.org/attachment.cgi?id=142426&action=edit
X process perf flamegraph

Hello!

I've noticed that after reboot there is a high cpu usage and slow rendering
performance.
Using top I've found that X process uses 10-15% CPU.
intel_gpu_top shows 90-100% GPU usage but on screen nothing happens.
After 10-15 minutes this load may disappear and performance returns to normal.

I'm using Dell XPS 13 with integrated Intel HD Graphics 620.
Software versions:
kernel: 4.19.0-gentoo
xorg-server: 1.20.3
xorg-proto: 2018.4
kde plasma: 5.51.0
kde plasma-desktop: 5.14.3

In attachments I'll provide reports of perf tool for X process and i915 events.

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