most likely /usr/bin/Xorg -logfile /tmp/Xorg.....it pops up all the time on mine.
I'd start by running powertop for 2 minutes or so screen off. Was stock kernel results you pasted done with screen on?
mv RSOC CSOC mA NAC CACD CACT TTF TTE TEMP EDV1 LOW 09:49 3794 66 66 -18 1346 1346 1346 65535 4311 22 0 09:50 3794 66 66 -9 1346 1346 1346 65535 8540 22 0 09:50 3794 66 66 -9 1346 1346 1346 65535 8230 22 0 09:50 3794 66 66 -9 1346 1346 1346 65535 8083 22 0 09:50 3794 66 66 -8 1346 1346 1346 65535 9053 22 0 09:50 3794 66 66 -15 1346 1346 1346 65535 5144 22 0 09:50 3794 66 66 -12 1346 1346 1346 65535 6375 22 0 09:50 3794 66 66 -9 1346 1346 1346 65535 8382 22 0 09:50 3794 66 66 -9 1346 1346 1346 65535 8229 22 0 09:50 3794 66 66 -8 1346 1346 1346 65535 9052 22 0 09:50 3794 66 66 -11 1346 1346 1346 65535 6963 22 0 09:50 3794 66 66 -17 1346 1346 1346 65535 4618 22 0 09:51 3794 66 66 -9 1346 1346 1346 65535 8229 22 0 09:51 3794 66 66 -9 1346 1346 1346 65535 8874 22 0 09:51 3794 66 66 -9 1346 1346 1346 65535 8381 22 0 09:51 3794 66 66 -9 1346 1346 1346 65535 8082 22 0 09:51 3794 66 66 -18 1346 1346 1346 65535 4310 22 0 09:51 3794 66 66 -9 1346 1346 1346 65535 8082 22 0 09:51 3794 66 66 -9 1346 1346 1346 65535 8874 22 0 09:51 3794 66 66 -9 1346 1346 1346 65535 8380 22 0 09:51 3791 66 66 -9 1346 1346 1346 65535 8702 22 0 09:51 3794 66 66 -18 1346 1346 1346 65535 4310 22 0 09:51 3794 66 66 -8 1346 1346 1346 65535 9235 22 0 09:51 3794 66 66 -9 1346 1346 1346 65535 8702 22 0