[Bug 98755] New: [i915] Graphics Regression: Window dragging, opening very slow and laggy

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98755

            Bug ID: 98755
           Summary: [i915] Graphics Regression: Window dragging, opening
                    very slow and laggy
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: aes368 at cornell.edu
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Hello,

I noticed that in newer Linux 4.8 kernels the desktop was performing very
poorly. Opening windows (such as xterm) takes a very long time, as does
dragging windows around the screen and resizing. Alt-tab also has significant
lag, with an exception being when switching between two fullscreen xterm
windows.

I am using IceWM as a window manager on Arch Linux.

After doing a bisection, I found that the issue is not present in 194dc870 and
is present on 554828ee, which does not touch the i915 driver directly
(https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/?id=554828ee0db41618d101d9549db8808af9fd9d65).
The bisection was done using the following AUR package:
https://aur.archlinux.org/packages/linux-git/

I have attached one video showing performance with the problem and one video
showing performance without the problem, as well as dmesg and other logs. I'll
be happy to provide more info to narrow down the problem.

Here is the Arch Linux forums thread this is first mentioned in.
https://bbs.archlinux.org/viewtopic.php?id=219349

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