XFCE + XBMC + Intel HD 4600

Смотрите логи xorg-server`а, а именно /var/log/Xorg.0.log.

хмм, и вправду хрень

[ 27.328] X.Org Video Driver: 18.0
[ 27.328] X.Org XInput driver : 21.0
[ 27.328] X.Org Server Extension : 8.0
[ 27.328] (II) xfree86: Adding drm device (/dev/dri/card0)
[ 27.329] (--) PCI:*(0:0:2:0) 8086:0402:1458:d000 rev 6, Mem @ 0xf7800000/4194304, 0xe0000000/268435456, I/O @ 0x0000f000/64
[ 27.329] (II) «glx» will be loaded. This was enabled by default and also specified in the config file.
[ 27.329] (II) LoadModule: «glx»
[ 27.348] (II) Loading /usr/lib64/xorg/modules/extensions/libglx.so
[ 27.348] (II) Module glx: vendor=«X.Org Foundation»
[ 27.348] compiled for 1.16.1, module version = 1.0.0
[ 27.348] ABI class: X.Org Server Extension, version 8.0
[ 27.348] (==) AIGLX enabled
[ 27.348] (II) LoadModule: «vnc»
[ 27.348] (II) Loading /usr/lib64/xorg/modules/extensions/libvnc.so
[ 27.351] (II) Module vnc: vendor=«Constantin Kaplinsky»
[ 27.351] compiled for 1.14.0, module version = 1.0.0
[ 27.351] Module class: X.Org Server Extension
[ 27.351] ABI class: X.Org Server Extension, version 7.0
[ 27.351] (EE) module ABI major version (7) doesn't match the server's version (8)
[ 27.351] (II) UnloadModule: «vnc»
[ 27.351] (II) Unloading vnc
[ 27.351] (EE) Failed to load module «vnc» (module requirement mismatch, 0)
[ 27.351] (II) LoadModule: «intel»
[ 27.351] (II) Loading /usr/lib64/xorg/modules/drivers/intel_drv.so
[ 27.351] (II) Module intel: vendor=«X.Org Foundation»
[ 27.351] compiled for 1.16.1, module version = 2.99.916
[ 27.351] Module class: X.Org Video Driver
[ 27.351] ABI class: X.Org Video Driver, version 18.0
[ 27.351] (II) intel: Driver for Intel(R) Integrated Graphics Chipsets:
i810, i810-dc100, i810e, i815, i830M, 845G, 854, 852GM/855GM, 865G,
915G, E7221 (i915), 915GM, 945G, 945GM, 945GME, Pineview GM,
Pineview G, 965G, G35, 965Q, 946GZ, 965GM, 965GME/GLE, G33, Q35, Q33,
GM45, 4 Series, G45/G43, Q45/Q43, G41, B43
[ 27.351] (II) intel: Driver for Intel(R) HD Graphics: 2000-6000
[ 27.351] (II) intel: Driver for Intel(R) Iris(TM) Graphics: 5100, 6100
[ 27.351] (II) intel: Driver for Intel(R) Iris(TM) Pro Graphics: 5200, 6200, P6300
[ 27.351] (++) using VT number 7

[ 27.352] (II) intel(0): Using Kernel Mode Setting driver: i915, version 1.6.0 20080730
[ 27.352] (--) intel(0): Integrated Graphics Chipset: Intel(R) HD Graphics
[ 27.352] (--) intel(0): CPU: x86-64, sse2, sse3, ssse3, sse4.1, sse4.2
[ 27.352] (II) intel(0): Creating default Display subsection in Screen section
«Screen0» for depth/fbbpp 16/16
[ 27.352] (**) intel(0): Depth 16, (--) framebuffer bpp 16
[ 27.352] (==) intel(0): RGB weight 565
[ 27.352] (==) intel(0): Default visual is TrueColor
[ 27.352] (**) intel(0): Option «DRI» «True»

[ 27.352] (==) intel(0): DPI set to (96, 96)
[ 27.352] (II) Loading sub module «dri3»
[ 27.352] (II) LoadModule: «dri3»
[ 27.352] (II) Module «dri3» already built-in
[ 27.352] (II) Loading sub module «dri2»
[ 27.352] (II) LoadModule: «dri2»
[ 27.352] (II) Module «dri2» already built-in
[ 27.352] (II) Loading sub module «present»
[ 27.352] (II) LoadModule: «present»
[ 27.352] (II) Module «present» already built-in
[ 27.353] (II) intel(0): SNA initialized with Haswell (gen7.5, gt1) backend
[ 27.353] (==) intel(0): Backing store enabled
[ 27.353] (==) intel(0): Silken mouse enabled
[ 27.353] (II) intel(0): HW Cursor enabled
[ 27.353] (II) intel(0): RandR 1.2 enabled, ignore the following RandR disabled message.
[ 27.353] (==) intel(0): DPMS enabled
[ 27.353] (II) intel(0): [DRI2] Setup complete
[ 27.353] (II) intel(0): [DRI2] DRI driver: i965
[ 27.353] (II) intel(0): [DRI2] VDPAU driver: i965
[ 27.353] (II) intel(0): direct rendering: DRI2 DRI3 enabled
[ 27.353] (II) intel(0): hardware support for Present enabled
[ 27.353] (==) intel(0): display hotplug detection enabled
[ 27.353] (--) RandR disabled
[ 27.366] (II) AIGLX: enabled GLX_MESA_copy_sub_buffer
[ 27.366] (II) AIGLX: enabled GLX_ARB_create_context
[ 27.366] (II) AIGLX: enabled GLX_ARB_create_context_profile
[ 27.366] (II) AIGLX: enabled GLX_EXT_create_context_es2_profile
[ 27.367] (II) AIGLX: enabled GLX_INTEL_swap_event
[ 27.367] (II) AIGLX: enabled GLX_SGI_swap_control and GLX_MESA_swap_control
[ 27.367] (II) AIGLX: enabled GLX_EXT_framebuffer_sRGB
[ 27.367] (II) AIGLX: enabled GLX_ARB_fbconfig_float
[ 27.367] (II) AIGLX: GLX_EXT_texture_from_pixmap backed by buffer objects
[ 27.367] (II) AIGLX: enabled GLX_ARB_create_context_robustness
[ 27.367] (II) AIGLX: Loaded and initialized i965
[ 27.367] (II) GLX: Initialized DRI2 GL provider for screen 0
[ 27.368] (II) intel(0): switch to mode 1680x1050@60.0 on HDMI2 using pipe 0, position (0, 0), rotation normal, reflection none
[ 27.383] (II) intel(0): Setting screen physical size to 444 x 277

и наконец

[ 27.480] (II) config/udev: Adding input device PC Speaker (/dev/input/event6)
[ 27.480] (II) No input driver specified, ignoring this device.
[ 27.480] (II) This device may have been added with another device file.
[ 35.083] (--) intel(0): HDMI max TMDS frequency 150000KHz
[ 35.147] (--) intel(0): HDMI max TMDS frequency 150000KHz
[ 35.219] (--) intel(0): HDMI max TMDS frequency 150000KHz
[ 35.280] (--) intel(0): HDMI max TMDS frequency 150000KHz
[ 35.584] (--) intel(0): HDMI max TMDS frequency 150000KHz
[ 35.590] (II) intel(0): switch to mode 1920x1080@60.0 on HDMI2 using pipe 0, position (0, 0), rotation normal, reflection none
[ 35.611] (II) intel(0): resizing framebuffer to 1920x1080
[ 35.687] (--) intel(0): HDMI max TMDS frequency 150000KHz
[ 35.750] (--) intel(0): HDMI max TMDS frequency 150000KHz
[ 35.815] (--) intel(0): HDMI max TMDS frequency 150000KHz
[ 35.876] (--) intel(0): HDMI max TMDS frequency 150000KHz

судя по всему в 24bpp так и не переходит, муть какая то

смысл был в том, что я неделю назад ставил опыты с VNC сервером, заодно сегодня разобрался параллельно что не так c ним (Настройка VNC Opensuse 13.1-13.2) :)))
в общем в папке xorg.conf.d есть файл 10-libvnc.conf вот в нем я понаставил параметров (в т.ч. и 16 бит) и этот файл идет в приоритет перед xorg.conf