[Intel-gfx] slow x11 after upgrade

[j j]

Hi

I found that x11 works much slower after my recent gentoo update.
I can see that it draws screen much slower than before system update.
I can see it when switching from one window workspace to another. After
update the
screen is redrawn much longer. I also can see it when playing movies with
mplayer. The audio is played faster than video what causes that audio and
video
is no longer synchronized. Now I get the message from mplayer saying "Your
system is to slow to play this movie". On the other hand glxgears shows the
same
results before and after an update but I'm 100% sure that the screen is
redrawn
significantly slower.

I performed an update very carefully. I did all the steps suggested by
gentoo
packages and "eselect news". I rebuild xf86-video-intel and most probably
turned on what is required in the kernel. My video hardware is intel (815
E) on
board chipset. I use fluxbox as window manager.

And now more details about the system before upgrade and after upgrade.
I upgrade my system twice a year. Previously I upgraded it in summer 2012
and
now I upgraded it at the beginning of 2013.

The details of the system after summer 2012 upgrade are as follows:
kernel: 3.2.21-gentoo (genkernel)
xorg-server: 1.12.2
xorg-x11: 7.4-r2
xf86-video-intel: 2.19.0 (use flags: dri -glamor -sna)
fluxbox: 1.0.0-r2

The details of the system after 2013 upgrade are as follows:
kernel: 3.5.7-gentoo
xorg-server: 1.13.1
xorg-x11: 7.4-r2
xf86-video-intel: 2.20.13 (use flags: dri sna udev -glamor -uxa -xvmc)
fluxbox: 1.3.2

I have also tried my old (backed up) kernel with new system and the problem
still exists so I conclude that it is most likely not a problem of kernel.

Please help me to solve this problem. I have no idea what may be wrong.
I will provide you whatever information you want.

thank you in advance
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