[Bug 99457] 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

--- Comment #26 from Michel Dänzer <michel at daenzer.net> ---
Thanks, this helps a little. Unfortunately though, it's still not clear where
drmmode_set_mode_major is getting called from. There are two possibilities for
getting better information about that:

1. Make sure /usr/bin/Xorg and /usr/lib64/xorg/modules/drivers/radeon_drv.so
are compiled with -fno-omit-frame-pointer (after any -O2/-O3 etc. flags), and
get another profile with sysprof.

2. Attach gdb to the Xorg process, and enter the following at the gdb prompt:

b drmmode_set_mode_major
commands 1
bt full
c
end
continue

After that, gdb should start spewing backtraces of where drmmode_set_mode_major
gets called from. You can interrupt it with Ctrl-C after a few seconds, then
attach the backtraces here.

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