I have a Dell Latitude E5510 with an intel GPU, which works absolutely fine, until I plug in an extra monitor or projector. I have a lot of hardware to work with and up until precise, about 40% of the hardware was displaying fine.
One monitor I'm working with (LG E2340T-PN) used to work with oneiric on full HD just fine. no problems at all!
After the (clean) installation of precise I suddenly have to use the 1680x1050 resolution. switching to 1080p just thrashes X.
The monitor I use at home is a Dell 20" (1680x1050 native). I have to switch to 1280x1024 to make my monitor work. If I don't, my screen flickers and jitters and tries to sync (constantly).
The projector I use at home is a SONY VPL-CX76 (1400x1050). no problems with it, at all! a Dell projector at work simply doesn't work at all (getting no signal). We have a couple high end sony projectors as well (1080p monsters), that give me the same jittering as on my monitor at home.
Right now I'm working on the 23" LG (1080p native, but running on 1680x1050 now)
my xrandr output:
VGA1 connected 1680x1050+0+0 (normal left inverted right x axis y axis) 510mm x 290mm 1920x1080 60.0 + 1680x1050 60.0* 1280x1024 75.0 60.0 1280x960 60.0 1152x864 75.0 1024x768 75.1 60.0 832x624 74.6 800x600 75.0 60.3 56.2 640x480 75.0 60.0 720x400 70.1 j0lle@j0lle-laptop:~$ lsmod | grep i915 i915 468651 3 drm_kms_helper 46978 1 i915 drm 242038 4 i915,drm_kms_helper i2c_algo_bit 13423 1 i915 video 19596 1 i915 j0lle@j0lle-laptop:~$ dpkg -l xserver-xorg-video-intel xserver-xorg-video-intel 2:2.17.0-1ubuntu4 X.Org X server -- Intel i8xx, i9xx display driver
I've been looking FOR MONTHS and I can't find a case like mine... Some are quite similar, but never the same.
I tried different kernels, different drivers (xorg-edgers), some patches, nothing worked so far.
I'm willing to try anything to get this resolved!
my 1080p is working again! will do more tests with other devices asap
I knew it was too good to be true. 1080p only works when I adjust it with xrandr. xrandr then leaves me with two partially overlapping desktops.
If I adjust it with 'Displays' it's still broken.
update3 I filed this bug: https://bugs.freedesktop.org/show_bug.cgi?id=49220