I have a Dell Inspiron 1525 laptop w/ Intel graphics:
00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 Integrated Graphics Controller (primary) (rev 0c)
My TV is an Olevia 27" which shows up in the display settings as "Synaptics Inc 27".
My HDMI output worked perfectly fine up through 10.10 and kernel 2.6.35-29, but yesterday I upgraded to 11.04 and now I have problems. The output to my TV still works, though there are tons of "scan lines" and any time I move the mouse or drag an application to the tv (vlc for instance), the lines get worse and go crazy. In display settings the TV is set by default to 1360x768 @ 60Hz which has always been the default and worked just fine, until 11.03 w/ the 2.6.38-10 kernel. I believe the native resolution of the tv is 1366x768 but the 1360x768 always worked.
I did figure out that I can set the resolution to 1024x768 @75Hz and the scan lines go away, but this is not ideal. I tried reverting back to the 2.6.35-29 kernel to see if it worked as it originally did in 10.10, and the scan lines do not appear, however the display only takes up 3/4 of the TV, with the other 1/4 black and most certainly the border. Definitely even less ideal. So I'm back on the 2.6.38-10 kernel for now using the lower resolution. I also notice that when playing a video, the video appears to be just a few milliseconds behind the audio; not a huge delay but just enough to be noticeable.
After a lot of Googling I tried to use xrandr to add and set a new mode of 1366x768 @ 60Hz for the TV, but the lines remain. My xrandr output is as follows:
Screen 0: minimum 320 x 200, current 2304 x 800, maximum 8192 x 8192 LVDS1 connected 1280x800+0+0 (normal left inverted right x axis y axis) 331mm x 207mm 1280x800 60.0*+ 1024x768 60.0 800x600 60.3 56.2 640x480 59.9 VGA1 disconnected (normal left inverted right x axis y axis) HDMI1 connected 1024x768+1280+0 (normal left inverted right x axis y axis) 600mm x 340mm 1360x768 60.0 + 1280x800 59.8 1280x768 59.9 60.0 1280x720 60.0 1024x768 75.1* 70.1 60.0 800x600 72.2 75.0 60.3 56.2 848x480 60.0 640x480 75.0 72.8 60.0 59.9** TV1 unknown connection (normal left inverted right x axis y axis) 848x480 30.0 + 640x480 30.0 + 1024x768 30.0 800x600 30.0
So, does anyone know what might have changed in the new kernel/video drivers that would cause this behavior to change from it's previously perfect operation in 10.10 and below? TIA!