I have a Viewsonic VS13818 HDMI monitor* that runs fine with the BBB Angstrom SW, but not with Ubuntu 13.04 LXDE, installed according to RCN’s instructions at http://elinux.org/BeagleBoardUbuntu#Canonical.2FUbuntu_Images. X windows starts up, shows a greeting, but flickers a lot. When I enter a password, the system emits a fb error (tilcdc 4830.e000.fb: timeout waiting for frame done) and the X system dies.
I suppose this is due to BBB not being able to deal with large HDMI monitors. If so, I need a way to reduce the resolution as X comes up. What’s the best way to do that? LXDE’s autostart file does not seem to work for this (inserting an xrandr command). I don’t have the courage to write an xorg.conf from scratch!
Thanks for any help!
Martin
*Monitor EDID Info:
EDID version 1 revision 3
Section “Monitor”
Block type: 2:0 3:ff
Block type: 2:0 3:fd
Block type: 2:0 3:fc
Identifier “VA2248 SERIES”
VendorName “VSC”
ModelName “VA2248 SERIES”
Block type: 2:0 3:ff
Block type: 2:0 3:fd
HorizSync 24-82
VertRefresh 50-75
Max dot clock (video bandwidth) 170 MHz
Block type: 2:0 3:fc
DPMS capabilities: Active off:yes Suspend:no Standby:no
Mode “1920x1080” # vfreq 60.000Hz, hfreq 67.500kHz
DotClock 148.500000
HTimings 1920 2008 2052 2200
VTimings 1080 1084 1089 1125
Flags “+HSync” “+VSync”
EndMode
Block type: 2:0 3:ff
Block type: 2:0 3:fd
Block type: 2:0 3:fc
EndSection