[Bug 92982] New: slow switching to KD_GRAPHICS (KMS?)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92982

            Bug ID: 92982
           Summary: slow switching to KD_GRAPHICS (KMS?)
           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: royvandervegt at gmail.com
        QA Contact: xorg-team at lists.x.org

Created attachment 119748
  --> https://bugs.freedesktop.org/attachment.cgi?id=119748&action=edit
cpu and glxinfo

I have been experiencing this problem since late 2013 when I started using
Linux, but I was never able to pinpoint the root cause.
When X starts, it takes a long time (5 - 10 sec) to display the desktop.
Switching from X/Wayland to tty and vice versa also takes the same amount of
time. After the switch is complete everything works fine.

Now I was programming some animations using the framebuffer device (/dev/fb0)
and I was using `ioctl(fd, KDSETMODE, KD_GRAPHICS)` to enable graphics mode
instead of text mode. This also takes 5 - 10 seconds. This might be a good
starting point?

KMS is enabled and also reported as such by X on startup. No special
configurations are in use, everything is vanilla.

System information:
 - ATI Mobility Radeon HD5470m (512mb)
 - Driver version: xf86-video-ati 1:7.5.0-2, but goes back a long time before
this version
 - Kernel: Linux arch 4.2.5-1-ARCH #1 SMP PREEMPT Tue Oct 27 08:13:28 CET 2015
x86_64 GNU/Linux

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