Hello, Our problem concerns the i810 driver. Sometimes, once in 40-50 hard restarts of the computer the second monitor does not start. Our system has a dual-head I915 video embedded in the north bridge. The two independent outputs of the video go into two monitors. The X config file is configured with two monitors. In the rare cases when the second monitor does not start, we have measured the output of the second video card inside the north bridge with oscilloscope and found out that there is absolutely no signal going out of the north bridge. I still don't know if the problem is in the hardware or in the software, but I believe there is some code in the i810 driver that disables or enables the video output depending on the circumstances. Maybe because of some racing condition sometimes the second video card gets disabled. Here is the output of lspci -v 00:02.0 VGA compatible controller: Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller (rev 04) (prog-if 00 [VGA]) Subsystem: Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller Flags: bus master, fast devsel, latency 0, IRQ 7 Memory at fdf00000 (32-bit, non-prefetchable) [size=512K] I/O ports at ff00 [size=8] Memory at d0000000 (32-bit, prefetchable) [size=256M] Memory at fdf80000 (32-bit, non-prefetchable) [size=256K] Capabilities: [d0] Power Management version 2 00:02.1 Display controller: Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller (rev 04) Subsystem: Intel Corporation Unknown device 2592 Flags: bus master, fast devsel, latency 0 Memory at fde80000 (32-bit, non-prefetchable) [size=512K] Capabilities: [d0] Power Management version 2 If this problem could be caused by the i810 driver, where should I look in the source to try to fix it? I am not a driver developer and certainly will find difficulties fixing this, but anyway any help on this will be highly appreciated. Thank you very much in advance, Kalin