[Bug 29384] Slow switch between TTY1-TTY6 with /dev/fb0 or X11 involved

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=29384

--- Comment #28 from peterle at hottemptation.org 2010-08-16 04:11:17 PDT ---
Solution found for bug 29384!
I noticed that everything looks like the kernel uses the new
power-managment-stuff also for the Evergreen graphics cards. And this leads to
the solution, the power_method "profile" doesn't work correct, the all problems
with slow switching while using /dev/fb* with fbi or mplayer are solved with
switching the power_method to "dynpm".

$ echo "dynpm" > /sys/class/drm/card0/device/power_method
check with 
$ cat /sys/class/drm/card0/device/power_method" //should report dynpm

Now everything works.
I can load a png-image with fbi on tty1, check dmesg output on tty2, while I am
watching a ioQuake3-Demo (of course without hardware-accleration) on X11. If
necessary I can use "pm-supend" and wakeup the system again, everything still
works.

@Alex Deucher:
Could it be a final solution
a) generally set "dynpm" for all Evergreen chips
or
b) switching of power-managment for Evergreen till is really supported in the
kernel


Now the bad news:
Using dynpm doesn't fix bug 27744
Further information:
http://www.x.org/wiki/radeonBuildHowTo#Troubleshootingradeonpower-management

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