hello everyone,

first of all, i am very impressed by deepin. never been impressed that much by any other distribution in the first place. i hope this impression will stay for a while :-)

after discovering that deepin performs very well on my rather old notebook with intel 945GM i was wondering why it goes completely sluggish (and mad) as soon as i connect an external display.

everything is extremely fluid otherwise and as soon as i connect the cable the whole system hangs and one CPU core is completely occupied by compiz.

is it possible that the drivers aren't configured right?

tried the intel graphics installer (from both deepin store and latest from 01.org) but it told me that the distribution isn't supported, despite trusty generally is.

will be very pleased by any kind of hint where to find that information.

thanks in advance

marc

What's is the display resolution of your laptop and the external one?

laptop: 1280x800, external: 1280x1024

driver output from inxi -G:

Graphics: Card: Intel Mobile 945GM/GMS 943/940GML Express Integrated Graphics Controller
X.Org: 1.15.1 drivers: intel (unloaded: fbdev,vesa) Resolution: 1280x800@60.0hz
GLX Renderer: Mesa DRI Intel 945GM x86/MMX/SSE2 GLX Version: 1.4 Mesa 10.1.3

Kernel: 3.13.0-45-generic i686 (32 bit) Desktop: N/A Distro: Deepin 2014.2 trusty

regards, marc

The graphics card performance drops with increased resolution with OpenGL(3D Acceleration) using programs; Compiz in question.

Can you try the external display while running without compiz window manager?

how can i turn just compiz off without affecting dde?

You can try, from a terminal:
Also, about newer drivers, see this post from TobiSGB:

http://www.linuxquestions.org/questi...7/#post5319398

and try using one of the PPAs he mentions:

https://launchpad.net/~xorg-edgers/+archive/ubuntu/ppa

https://launchpad.net/~oibaf/+archiv...aphics-drivers

I was having a similar problem that was solved by adding the oibaf PPA.

1 members found this post helpful.

thanks for the xrandr hint, googling this with compiz found me the solution:

http://ubuntuforums.org/showthread.php?t=1466415

just killall compiz, then xrandr, then restart compiz. even survives a reboot.

so apparently it wasn't about the drivers. but thanks anyway for the links.

do you know whether it possible to file a bug report for the maintainers to implement a workaround?

For xrandr:

https://bugs.freedesktop.org/buglist...ormat=specific

I think you need a bugzilla account in order to report bugs.

https://bugs.freedesktop.org/enter_bug.cgi