Arch Linux

Natanji

Member

Registered: 2009-09-22

Posts: 133

Intel GMA 945: xrandr trouble

Hello everyone,
I recently observed that when rotating the screen using xrandr -o, it becomes very dark. I'm on a Thinkpad X60 Tablet with Intel GMA 945 and up to date intel driver and Xorg. I have checked this on a laptop of the same model by a friend also running Arch and she has the same problem. A few months ago, there were no problems with this functionality, although I am unsure when exactly it happened. I don't know which software is to blame either, so I would kindly ask other GMA 945 family users to check if they also have this problem on their machines. Maybe we can bugtrack this together.

Natanji

Member

Registered: 2009-09-22

Posts: 133

Re: Intel GMA 945: xrandr trouble

*bump* No one else using xrandr?

mcmillan

Member

Registered: 2006-04-06

Posts: 737

Re: Intel GMA 945: xrandr trouble

It seems to work for me, also using intel, but on a T60

lspci | grep VGA gives me:

00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics Controller (rev 03)

Natanji

Member

Registered: 2009-09-22

Posts: 133

Re: Intel GMA 945: xrandr trouble

Exact same output for me. This is weird... what else could make this happen? What is your output from pacman -Q | grep intel ?

intel-dri 7.9.0.git20101207-2
xf86-video-intel 2.13.0-4

mcmillan

Member

Registered: 2006-04-06

Posts: 737

Re: Intel GMA 945: xrandr trouble

intel-dri 7.9.0.git20101207-2
xf86-video-intel 2.13.0-4

Same thing

Were you testing this with an external hooked or just the laptop screen? When I did it before I was just on my laptop. I just tried now hooking up with a second screen and it did dim my laptop display.

helloworld1

Member

Registered: 2010-12-26

Posts: 72

Re: Intel GMA 945: xrandr trouble

I have the same issue with GMA HD, core i7. When I use xrandr to change resolution, the screen will be the darkest.

Natanji

Member

Registered: 2009-09-22

Posts: 133

Re: Intel GMA 945: xrandr trouble

No, I don't have any external display connected and the VGA output is also not enabled when I connect anything to it (need xrandr --auto first). Hooking up an external display doesn't dim anything for me. This is just plain weird... so I suppose because multiple people have this, this is an upstream bug that should be reported? It seems to be Intel-only from what I can find...

redbit

Member

Registered: 2007-11-13

Posts: 57

Re: Intel GMA 945: xrandr trouble

I'm facing similar problems with an Thinkpad X60 (Intel 945GM):
Switching with xrandr to the external monitor and disabling the notebook screen works fine. Afterwards if I want to switch back from external monitor to the internal screen, the internal screen does not turn on and stays black.
Suspending before switching back is a dirty workaround but not really a solution.

Last edited by redbit (2011-02-05 09:59:42)