Hola.
El log de Xorg no está en la ruta que indicas, la tengo en /home/usuario/.local/share/Xorg y devuelve lo siguiente
[ 1600.219] (II) modeset(0): Analog Display Input, Input Voltage Level: 0.700/0.700 V
De todas formas ejecuté también "lscpi -v" y sale lo siguinte
00:02.0 VGA compatible controller: Intel Corporation Core Processor Integrated Graphics Controller (rev 12) (prog-if 00 [VGA controller])
Subsystem: Foxconn International, Inc. Core Processor Integrated Graphics Controller
Flags: bus master, fast devsel, latency 0, IRQ 27
Memory at fb800000 (64-bit, non-prefetchable) [size=4M]
Memory at d0000000 (64-bit, prefetchable) [size=256M]
I/O ports at cc00 [size=8]
[virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [d0] Power Management version 2
Capabilities: [a4] PCI Advanced Features
Kernel driver in use: i915
Kernel modules: i915