Strange startup behaviour of GUI

Hello, I installed Manjaro Xfce on Asus N53DA, First “images” does not appear correctly. You can see on this link.. I tried early KMS, nothing changes.
I found one post with the same problem, where he/she said kernel update improved the problem. Now i am 5.15 LTS kernel.
Official GPU driver automatic installer says up to Xserver 1.10version is not supported.
On the photo you can see, what is happening and on the link, video, how exactly it is happening

inxi -Fxxxza --no-host
inxi -Fxxxza --no-host
System:
  Kernel: 5.15.19-1-MANJARO x86_64 bits: 64 compiler: gcc v: 11.1.0
    parameters: BOOT_IMAGE=/boot/vmlinuz-5.15-x86_64
    root=UUID=3af68759-6171-4cf4-9cbc-ee3ae4d0f98f rw quiet apparmor=1
    security=apparmor udev.log_priority=3
  Desktop: Xfce 4.16.0 tk: Gtk 3.24.29 info: xfce4-panel wm: xfwm 4.16.1
    vt: 7 dm: LightDM 1.30.0 Distro: Manjaro Linux base: Arch Linux
Machine:
  Type: Laptop System: ASUSTeK product: N53DA v: 1.0
    serial: <superuser required>
  Mobo: ASUSTeK model: N53DA v: 1.0 serial: <superuser required>
    BIOS: American Megatrends v: N53DA.207 date: 04/08/2011
Battery:
  ID-1: BAT0 charge: 5.1 Wh (89.5%) condition: 5.7/48.4 Wh (11.7%)
    volts: 11.0 min: 11.1 model: ASUSTek M50--24 type: Li-ion serial: N/A
    status: Discharging
CPU:
  Info: model: AMD Phenom II P960 bits: 64 type: MCP arch: K10
    family: 0x10 (16) model-id: 5 stepping: 3 microcode: 0x10000C8
  Topology: cpus: 1x cores: 4 smt: <unsupported> cache: L1: 512 KiB
    desc: d-4x64 KiB; i-4x64 KiB L2: 2 MiB desc: 4x512 KiB
  Speed (MHz): avg: 800 min/max: 800/1800 boost: disabled scaling:
    driver: acpi-cpufreq governor: schedutil cores: 1: 800 2: 800 3: 800 4: 800
    bogomips: 14370
  Flags: ht lm nx pae sse sse2 sse3 sse4a svm
  Vulnerabilities:
  Type: itlb_multihit status: Not affected
  Type: l1tf status: Not affected
  Type: mds status: Not affected
  Type: meltdown status: Not affected
  Type: spec_store_bypass status: Not affected
  Type: spectre_v1
    mitigation: usercopy/swapgs barriers and __user pointer sanitization
  Type: spectre_v2
    mitigation: Full AMD retpoline, STIBP: disabled, RSB filling
  Type: srbds status: Not affected
  Type: tsx_async_abort status: Not affected
Graphics:
  Device-1: AMD Whistler [Radeon HD 6630M/6650M/6750M/7670M/7690M]
    vendor: ASUSTeK driver: radeon v: kernel bus-ID: 01:00.0 chip-ID: 1002:6741
    class-ID: 0300
  Device-2: IMC Networks UVC VGA Webcam type: USB driver: uvcvideo
    bus-ID: 3-3:2 chip-ID: 13d3:5710 class-ID: 0e02 serial: <filter>
  Display: x11 server: X.Org 1.21.1.3 compositor: xfwm4 v: 4.16.1 driver:
    loaded: radeon display-ID: :0.0 screens: 1
  Screen-1: 0 s-res: 1366x768 s-dpi: 96 s-size: 361x203mm (14.2x8.0")
    s-diag: 414mm (16.3")
  Monitor-1: LVDS res: 1366x768 hz: 60
  OpenGL: renderer: AMD TURKS (DRM 2.50.0 / 5.15.19-1-MANJARO LLVM 13.0.0)
    v: 3.3 Mesa 21.3.5 compat-v: 3.1 direct render: Yes
Audio:
  Device-1: AMD SBx00 Azalia vendor: ASUSTeK driver: snd_hda_intel v: kernel
    bus-ID: 00:14.2 chip-ID: 1002:4383 class-ID: 0403
  Device-2: AMD Turks HDMI Audio [Radeon HD 6500/6600 / 6700M Series]
    vendor: ASUSTeK driver: snd_hda_intel v: kernel bus-ID: 01:00.1
    chip-ID: 1002:aa90 class-ID: 0403
  Sound Server-1: ALSA v: k5.15.19-1-MANJARO running: yes
  Sound Server-2: JACK v: 1.9.20 running: no
  Sound Server-3: PulseAudio v: 15.0 running: yes
  Sound Server-4: PipeWire v: 0.3.45 running: no
Network:
  Device-1: Qualcomm Atheros AR9285 Wireless Network Adapter
    vendor: AzureWave AW-NE785 / AW-NE785H 802.11bgn driver: ath9k v: kernel
    bus-ID: 04:00.0 chip-ID: 168c:002b class-ID: 0280
  IF: wlp4s0 state: up mac: <filter>
  Device-2: Qualcomm Atheros AR8151 v2.0 Gigabit Ethernet vendor: ASUSTeK
    driver: atl1c v: kernel port: d000 bus-ID: 05:00.0 chip-ID: 1969:1083
    class-ID: 0200
  IF: enp5s0 state: down mac: <filter>
Bluetooth:
  Device-1: ASUSTek BT-270 Bluetooth Adapter type: USB driver: btusb v: 0.8
    bus-ID: 5-4:2 chip-ID: 0b05:1788 class-ID: fe01 serial: <filter>
  Report: rfkill ID: hci0 rfk-id: 3 state: down bt-service: enabled,running
    rfk-block: hardware: no software: yes address: see --recommends
Drives:
  Local Storage: total: 596.17 GiB used: 25.6 GiB (4.3%)
  SMART Message: Unable to run smartctl. Root privileges required.
  ID-1: /dev/sda maj-min: 8:0 vendor: Western Digital
    model: WD6400BPVT-80HXZT1 size: 596.17 GiB block-size: physical: 4096 B
    logical: 512 B speed: 3.0 Gb/s type: HDD rpm: 5400 serial: <filter>
    rev: 1A01 scheme: MBR
Partition:
  ID-1: / raw-size: 250.39 GiB size: 245.4 GiB (98.01%) used: 9.99 GiB (4.1%)
    fs: ext4 dev: /dev/sda2 maj-min: 8:2
  ID-2: /home raw-size: 345.78 GiB size: 339.28 GiB (98.12%)
    used: 15.61 GiB (4.6%) fs: ext4 dev: /dev/sda1 maj-min: 8:1
Swap:
  Alert: No swap data was found.
Sensors:
  System Temperatures: cpu: 42.6 C mobo: N/A gpu: radeon temp: 41.0 C
  Fan Speeds (RPM): N/A
Info:
  Processes: 202 Uptime: 3h 8m wakeups: 13 Memory: 3.83 GiB
  used: 1.52 GiB (39.7%) Init: systemd v: 250 tool: systemctl Compilers:
  gcc: 11.1.0 clang: 13.0.0 Packages: 1091 pacman: 1087 lib: 305 flatpak: 0
  snap: 4 Shell: Bash v: 5.1.16 running-in: xfce4-terminal inxi: 3.3.12


$ journalctl --boot=-1 --priority=3 --catalog | less

$ journalctl --boot=-1 --priority=3 --catalog | less
systemd-coredump[1509]: Failed to connect to coredump service: Connection refused
 kernel: watchdog: watchdog0: watchdog did not stop!

Below you can see part of xorg log:
[    38.731] 
X.Org X Server 1.21.1.3
X Protocol Version 11, Revision 0
[    38.731] Current Operating System: Linux mikheils-n53da 5.15.19-1-MANJARO #1 SMP PREEMPT Tue Feb 1 16:58:17 UTC 2022 x86_64
[    38.731] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-5.15-x86_64 root=UUID=3af68759-6171-4cf4-9cbc-ee3ae4d0f98f rw quiet apparmor=1 security=apparmor udev.log_priority=3
[    38.731]  
[    38.731] Current version of pixman: 0.40.0
[    38.731] 	Before reporting problems, check http://wiki.x.org
	to make sure that you have the latest version.
[    38.731] Markers: (--) probed, (**) from config file, (==) default setting,
	(++) from command line, (!!) notice, (II) informational,
	(WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[    38.731] (==) Log file: "/var/log/Xorg.0.log", Time: Fri Feb 11 10:19:16 2022
[    39.670] (==) Using config directory: "/etc/X11/xorg.conf.d"
[    39.670] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
[    41.381] (==) No Layout section.  Using the first Screen section.
[    41.381] (==) No screen section available. Using defaults.
[    41.381] (**) |-->Screen "Default Screen Section" (0)
[    41.381] (**) |   |-->Monitor "<default monitor>"
[    41.382] (==) No device specified for screen "Default Screen Section".
	Using the first device section listed.
[    41.382] (**) |   |-->Device "Radeon"
[    41.382] (**) |   |-->GPUDevice "Radeon"
[    41.382] (==) No monitor specified for screen "Default Screen Section".
	Using a default monitor configuration.
[    41.382] (==) Automatically adding devices
[    41.382] (==) Automatically enabling devices
[    41.382] (==) Automatically adding GPU devices
[    41.382] (==) Automatically binding GPU devices
[    41.382] (==) Max clients allowed: 256, resource mask: 0x1fffff
[    41.704] (WW) The directory "/usr/share/fonts/OTF" does not exist.
[    41.704] 	Entry deleted from font path.
[    41.704] (WW) The directory "/usr/share/fonts/Type1" does not exist.
[    41.704] 	Entry deleted from font path.
[    41.704] (WW) The directory "/usr/share/fonts/100dpi" does not exist.
[    41.704] 	Entry deleted from font path.
[    41.704] (WW) The directory "/usr/share/fonts/75dpi" does not exist.
[    41.705] 	Entry deleted from font path.
[    41.705] (==) FontPath set to:
	/usr/share/fonts/misc,
	/usr/share/fonts/TTF
[    41.705] (==) ModulePath set to "/usr/lib/xorg/modules"
[    41.705] (II) The server relies on udev to provide the list of input devices.
	If no devices become available, reconfigure udev or disable AutoAddDevices.
[    41.705] (II) Module ABI versions:
[    41.705] 	X.Org ANSI C Emulation: 0.4
[    41.705] 	X.Org Video Driver: 25.2
[    41.705] 	X.Org XInput driver : 24.4
[    41.705] 	X.Org Server Extension : 10.0
[    41.707] (++) using VT number 7

[    41.708] (II) systemd-logind: logind integration requires -keeptty and -keeptty was not provided, disabling logind integration
[    41.710] (II) xfree86: Adding drm device (/dev/dri/card0)
[    41.710] (II) Platform probe for /sys/devices/pci0000:00/0000:00:02.0/0000:01:00.0/drm/card0
[    41.720] (--) PCI:*(1@0:0:0) 1002:6741:1043:1cd2 rev 0, Mem @ 0xd0000000/268435456, 0xfdf00000/131072, I/O @ 0x0000e000/256, BIOS @ 0x????????/131072
[    41.720] (WW) Open ACPI failed (/var/run/acpid.socket) (No such file or directory)
[    41.720] (II) LoadModule: "glx"
[    41.910] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so
[    42.504] (II) Module glx: vendor="X.Org Foundation"
[    42.504] 	compiled for 1.21.1.3, module version = 1.0.0
[    42.505] 	ABI class: X.Org Server Extension, version 10.0
[    42.505] (II) LoadModule: "radeon"
[    42.505] (II) Loading /usr/lib/xorg/modules/drivers/radeon_drv.so
[    42.715] (II) Module radeon: vendor="X.Org Foundation"
[    42.715] 	compiled for 1.21.1.1, module version = 19.1.0
[    42.715] 	Module class: X.Org Video Driver
[    42.715] 	ABI class: X.Org Video Driver, version 25.2
[    42.715] (II) RADEON: Driver for ATI/AMD Radeon chipsets:
**Cut here, in another window**

[    42.737] (II) [KMS] Kernel modesetting enabled.
[    42.737] (II) RADEON(0): Creating default Display subsection in Screen section
	"Default Screen Section" for depth/fbbpp 24/32
[    42.737] (==) RADEON(0): Depth 24, (--) framebuffer bpp 32
[    42.737] (II) RADEON(0): Pixel depth = 24 bits stored in 4 bytes (32 bpp pixmaps)
[    42.737] (==) RADEON(0): Default visual is TrueColor
[    42.737] (**) RADEON(0): Option "EXAPixmaps" "off"
[    42.737] (**) RADEON(0): Option "TearFree" "on"
[    42.737] (==) RADEON(0): RGB weight 888
[    42.737] (II) RADEON(0): Using 8 bits per RGB (8 bit DAC)
[    42.737] (--) RADEON(0): Chipset: "TURKS" (ChipID = 0x6741)
[    42.738] (II) Loading sub module "fb"
[    42.738] (II) LoadModule: "fb"
[    42.738] (II) Module "fb" already built-in
[    42.738] (II) Loading sub module "dri2"
[    42.738] (II) LoadModule: "dri2"
[    42.738] (II) Module "dri2" already built-in
[    46.914] (II) Loading sub module "glamoregl"
[    46.914] (II) LoadModule: "glamoregl"
[    46.914] (II) Loading /usr/lib/xorg/modules/libglamoregl.so
[    46.996] (II) Module glamoregl: vendor="X.Org Foundation"
[    46.996] 	compiled for 1.21.1.3, module version = 1.0.1
[    46.996] 	ABI class: X.Org ANSI C Emulation, version 0.4
[    47.226] (II) RADEON(0): glamor X acceleration enabled on AMD TURKS (DRM 2.50.0 / 5.15.19-1-MANJARO, LLVM 13.0.0)
[    47.226] (II) RADEON(0): glamor detected, initialising EGL layer.
[    47.226] (II) RADEON(0): KMS Color Tiling: enabled
[    47.226] (II) RADEON(0): KMS Color Tiling 2D: enabled
[    47.226] (**) RADEON(0): TearFree property default: on
[    47.226] (II) RADEON(0): KMS Pageflipping: enabled
[    47.229] (II) RADEON(0): Output LVDS has no monitor section
[    47.231] (II) RADEON(0): Output HDMI-0 has no monitor section
[    47.243] (II) RADEON(0): Output VGA-0 has no monitor section
[    47.246] (II) RADEON(0): EDID for output LVDS
[    47.246] (II) RADEON(0): Printing probed modes for output LVDS
[    47.246] (II) RADEON(0): Modeline "1366x768"x60.0   78.05  1366 1414 1446 1646  768 770 775 790 -vsync (47.4 kHz eP)
[    47.246] (II) RADEON(0): Modeline "1280x720"x60.0   74.65  1280 1344 1472 1664  720 723 728 748 -hsync +vsync (44.9 kHz)
[    47.246] (II) RADEON(0): Modeline "1152x768"x59.9   71.95  1152 1216 1328 1504  768 771 781 798 -hsync +vsync (47.8 kHz)
[    47.246] (II) RADEON(0): Modeline "1024x768"x59.9   63.53  1024 1072 1176 1328  768 771 775 798 -hsync +vsync (47.8 kHz)
[    47.246] (II) RADEON(0): Modeline "800x600"x60.0   38.31  800 832 912 1024  600 603 607 624 -hsync +vsync (37.4 kHz)
[    47.246] (II) RADEON(0): Modeline "848x480"x59.9   31.65  848 872 952 1056  480 483 493 500 -hsync +vsync (30.0 kHz)
[    47.246] (II) RADEON(0): Modeline "720x480"x59.9   26.85  720 744 808 896  480 483 493 500 -hsync +vsync (30.0 kHz)
[    47.246] (II) RADEON(0): Modeline "640x480"x59.9   23.98  640 664 720 800  480 483 487 500 -hsync +vsync (30.0 kHz)
[    47.248] (II) RADEON(0): EDID for output HDMI-0
[    47.263] (II) RADEON(0): EDID for output VGA-0
[    47.263] (II) RADEON(0): Output LVDS connected
[    47.263] (II) RADEON(0): Output HDMI-0 disconnected
[    47.263] (II) RADEON(0): Output VGA-0 disconnected
[    47.263] (II) RADEON(0): Using exact sizes for initial modes
[    47.263] (II) RADEON(0): Output LVDS using initial mode 1366x768 +0+0
[    47.263] (II) RADEON(0): mem size init: gart size :3fdde000 vram size: s:40000000 visible:f87d000
[    47.263] (==) RADEON(0): DPI set to (96, 96)
[    47.263] (==) RADEON(0): Using gamma correction (1.0, 1.0, 1.0)
[    47.263] (II) Loading sub module "ramdac"
[    47.263] (II) LoadModule: "ramdac"
[    47.263] (II) Module "ramdac" already built-in
[    47.263] (II) RADEON(0): [DRI2] Setup complete
[    47.263] (II) RADEON(0): [DRI2]   DRI driver: r600
[    47.264] (II) RADEON(0): [DRI2]   VDPAU driver: r600
[    47.264] (II) RADEON(0): Front buffer size: 4224K
[    47.264] (II) RADEON(0): VRAM usage limit set to 225118K
[    47.308] (II) RADEON(0): SYNC extension fences enabled
[    47.309] (II) RADEON(0): Present extension enabled
[    47.309] (==) RADEON(0): DRI3 enabled
[    47.309] (==) RADEON(0): Backing store enabled
[    47.309] (II) RADEON(0): Direct rendering enabled
[    47.583] (II) RADEON(0): Use GLAMOR acceleration.
[    47.583] (II) RADEON(0): Acceleration enabled
[    47.583] (==) RADEON(0): DPMS enabled
[    47.583] (==) RADEON(0): Silken mouse enabled
[    47.583] (II) RADEON(0): Set up textured video (glamor)
[    47.584] (II) RADEON(0): [XvMC] Associated with GLAMOR Textured Video.
[    47.584] (II) RADEON(0): [XvMC] Extension initialized.
[    47.633] (II) Initializing extension Generic Event Extension
[    47.633] (II) Initializing extension SHAPE
[    47.634] (II) Initializing extension MIT-SHM
[    47.634] (II) Initializing extension XInputExtension
[    47.635] (II) Initializing extension XTEST
[    47.636] (II) Initializing extension BIG-REQUESTS
[    47.636] (II) Initializing extension SYNC
[    47.637] (II) Initializing extension XKEYBOARD
[    47.637] (II) Initializing extension XC-MISC
[    47.638] (II) Initializing extension SECURITY
[    47.638] (II) Initializing extension XFIXES
[    47.639] (II) Initializing extension RENDER
[    47.639] (II) Initializing extension RANDR
[    47.640] (II) Initializing extension COMPOSITE
[    47.641] (II) Initializing extension DAMAGE
[    47.641] (II) Initializing extension MIT-SCREEN-SAVER
[    47.642] (II) Initializing extension DOUBLE-BUFFER
[    47.642] (II) Initializing extension RECORD
[    47.643] (II) Initializing extension DPMS
[    47.643] (II) Initializing extension Present
[    47.644] (II) Initializing extension DRI3
[    47.644] (II) Initializing extension X-Resource
[    47.645] (II) Initializing extension XVideo
[    47.645] (II) Initializing extension XVideo-MotionCompensation
[    47.646] (II) Initializing extension GLX
[    47.663] (II) AIGLX: Loaded and initialized r600
[    47.663] (II) GLX: Initialized DRI2 GL provider for screen 0
[    47.663] (II) Initializing extension XFree86-VidModeExtension
[    47.664] (II) Initializing extension XFree86-DGA
[    47.664] (II) Initializing extension XFree86-DRI
[    47.664] (II) Initializing extension DRI2
[    47.665] (II) RADEON(0): Setting screen physical size to 361 x 203
Continues below:
ATI Radeon Mobility X600 (M24), ATI FireMV 2400,
	ATI Radeon Mobility X300 (M24), ATI FireGL M24 GL,
	ATI Radeon X600 (RV380), ATI FireGL V3200 (RV380),
	ATI Radeon IGP320 (A3), ATI Radeon IGP330/340/350 (A4),
	ATI Radeon 9500, ATI Radeon 9600TX, ATI FireGL Z1, ATI Radeon 9800SE,
	ATI Radeon 9800, ATI FireGL X2, ATI Radeon 9600, ATI Radeon 9600SE,
	ATI Radeon 9600XT, ATI FireGL T2, ATI Radeon 9650, ATI FireGL RV360,
	ATI Radeon 7000 IGP (A4+), ATI Radeon 8500 AIW,
	ATI Radeon IGP320M (U1), ATI Radeon IGP330M/340M/350M (U2),
	ATI Radeon Mobility 7000 IGP, ATI Radeon 9000/PRO, ATI Radeon 9000,
	ATI Radeon X800 (R420), ATI Radeon X800PRO (R420),
	ATI Radeon X800SE (R420), ATI FireGL X3 (R420),
	ATI Radeon Mobility 9800 (M18), ATI Radeon X800 SE (R420),
	ATI Radeon X800XT (R420), ATI Radeon X800 VE (R420),
	ATI Radeon X850 (R480), ATI Radeon X850 XT (R480),
	ATI Radeon X850 SE (R480), ATI Radeon X850 PRO (R480),
	ATI Radeon X850 XT PE (R480), ATI Radeon Mobility M7,
	ATI Mobility FireGL 7800 M7, ATI Radeon Mobility M6,
	ATI FireGL Mobility 9000 (M9), ATI Radeon Mobility 9000 (M9),
	ATI Radeon 9700 Pro, ATI Radeon 9700/9500Pro, ATI FireGL X1,
	ATI Radeon 9800PRO, ATI Radeon 9800XT,
	ATI Radeon Mobility 9600/9700 (M10/M11),
	ATI Radeon Mobility 9600 (M10), ATI Radeon Mobility 9600 (M11),
	ATI FireGL Mobility T2 (M10), ATI FireGL Mobility T2e (M11),
	ATI Radeon, ATI FireGL 8700/8800, ATI Radeon 8500, ATI Radeon 9100,
	ATI Radeon 7500, ATI Radeon VE/7000, ATI ES1000,
	ATI Radeon Mobility X300 (M22), ATI Radeon Mobility X600 SE (M24C),
	ATI FireGL M22 GL, ATI Radeon X800 (R423), ATI Radeon X800PRO (R423),
	ATI Radeon X800LE (R423), ATI Radeon X800SE (R423),
	ATI Radeon X800 XTP (R430), ATI Radeon X800 XL (R430),
	ATI Radeon X800 SE (R430), ATI Radeon X800 (R430),
	ATI FireGL V7100 (R423), ATI FireGL V5100 (R423),
	ATI FireGL unknown (R423), ATI Mobility FireGL V5000 (M26),
	ATI Mobility Radeon X700 XL (M26), ATI Mobility Radeon X700 (M26),
	ATI Radeon X550XTX, ATI Radeon 9100 IGP (A5),
	ATI Radeon Mobility 9100 IGP (U3), ATI Radeon XPRESS 200,
	ATI Radeon XPRESS 200M, ATI Radeon 9250, ATI Radeon 9200,
	ATI Radeon 9200SE, ATI FireMV 2200, ATI Radeon X300 (RV370),
	ATI Radeon X600 (RV370), ATI Radeon X550 (RV370),
	ATI FireGL V3100 (RV370), ATI FireMV 2200 PCIE (RV370),
	ATI Radeon Mobility 9200 (M9+), ATI Mobility Radeon X800 XT (M28),
	ATI Mobility FireGL V5100 (M28), ATI Mobility Radeon X800 (M28),
	ATI Radeon X850, ATI unknown Radeon / FireGL (R480),
	ATI Radeon X800XT (R423), ATI FireGL V5000 (RV410),
	ATI Radeon X700 XT (RV410), ATI Radeon X700 PRO (RV410),
	ATI Radeon X700 SE (RV410), ATI Radeon X700 (RV410),
	ATI Radeon X1800, ATI Mobility Radeon X1800 XT,
	ATI Mobility Radeon X1800, ATI Mobility FireGL V7200,
	ATI FireGL V7200, ATI FireGL V5300, ATI Mobility FireGL V7100,
	ATI FireGL V7300, ATI FireGL V7350, ATI Radeon X1600, ATI RV505,
	ATI Radeon X1300/X1550, ATI Radeon X1550, ATI M54-GL,
	ATI Mobility Radeon X1400, ATI Radeon X1550 64-bit,
	ATI Mobility Radeon X1300, ATI Radeon X1300, ATI FireGL V3300,
	ATI FireGL V3350, ATI Mobility Radeon X1450,
	ATI Mobility Radeon X2300, ATI Mobility Radeon X1350,
	ATI FireMV 2250, ATI Radeon X1650, ATI Mobility FireGL V5200,
	ATI Mobility Radeon X1600, ATI Radeon X1300 XT/X1600 Pro,
	ATI FireGL V3400, ATI Mobility FireGL V5250,
	ATI Mobility Radeon X1700, ATI Mobility Radeon X1700 XT,
	ATI FireGL V5200, ATI Radeon X2300HD, ATI Mobility Radeon HD 2300,
	ATI Radeon X1950, ATI Radeon X1900, ATI AMD Stream Processor,
	ATI RV560, ATI Mobility Radeon X1900, ATI Radeon X1950 GT, ATI RV570,
	ATI FireGL V7400, ATI Radeon 9100 PRO IGP,
	ATI Radeon Mobility 9200 IGP, ATI Radeon X1200, ATI RS740,
	ATI RS740M, ATI Radeon HD 2900 XT, ATI Radeon HD 2900 Pro,
	ATI Radeon HD 2900 GT, ATI FireGL V8650, ATI FireGL V8600,
	ATI FireGL V7600, ATI Radeon 4800 Series, ATI Radeon HD 4870 x2,
	ATI Radeon HD 4850 x2, ATI FirePro V8750 (FireGL),
	ATI FirePro V7760 (FireGL), ATI Mobility RADEON HD 4850,
	ATI Mobility RADEON HD 4850 X2, ATI FirePro RV770,
	AMD FireStream 9270, AMD FireStream 9250, ATI FirePro V8700 (FireGL),
	ATI Mobility RADEON HD 4870, ATI Mobility RADEON M98,
	ATI FirePro M7750, ATI M98, ATI Mobility Radeon HD 4650,
	ATI Radeon RV730 (AGP), ATI Mobility Radeon HD 4670,
	ATI FirePro M5750, ATI RV730XT [Radeon HD 4670], ATI RADEON E4600,
	ATI Radeon HD 4600 Series, ATI RV730 PRO [Radeon HD 4650],
	ATI FirePro V7750 (FireGL), ATI FirePro V5700 (FireGL),
	ATI FirePro V3750 (FireGL), ATI Mobility Radeon HD 4830,
	ATI Mobility Radeon HD 4850, ATI FirePro M7740, ATI RV740,
	ATI Radeon HD 4770, ATI Radeon HD 4700 Series, ATI RV610,
	ATI Radeon HD 2400 XT, ATI Radeon HD 2400 Pro,
	ATI Radeon HD 2400 PRO AGP, ATI FireGL V4000, ATI Radeon HD 2350,
	ATI Mobility Radeon HD 2400 XT, ATI Mobility Radeon HD 2400,
	ATI RADEON E2400, ATI FireMV 2260, ATI RV670, ATI Radeon HD3870,
	ATI Mobility Radeon HD 3850, ATI Radeon HD3850,
	ATI Mobility Radeon HD 3850 X2, ATI Mobility Radeon HD 3870,
	ATI Mobility Radeon HD 3870 X2, ATI Radeon HD3870 X2,
	ATI FireGL V7700, ATI Radeon HD3690, AMD Firestream 9170,
	ATI Radeon HD 4550, ATI Radeon RV710, ATI Radeon HD 4350,
	ATI Mobility Radeon 4300 Series, ATI Mobility Radeon 4500 Series,
	ATI FirePro RG220, ATI Mobility Radeon 4330, ATI RV630,
	ATI Mobility Radeon HD 2600, ATI Mobility Radeon HD 2600 XT,
	ATI Radeon HD 2600 XT AGP, ATI Radeon HD 2600 Pro AGP,
	ATI Radeon HD 2600 XT, ATI Radeon HD 2600 Pro, ATI Gemini RV630,
	ATI Gemini Mobility Radeon HD 2600 XT, ATI FireGL V5600,
	ATI FireGL V3600, ATI Radeon HD 2600 LE,
	ATI Mobility FireGL Graphics Processor, ATI Radeon HD 3470,
	ATI Mobility Radeon HD 3430, ATI Mobility Radeon HD 3400 Series,
	ATI Radeon HD 3450, ATI Radeon HD 3430, ATI FirePro V3700,
	ATI FireMV 2450, ATI Radeon HD 3600 Series, ATI Radeon HD 3650 AGP,
	ATI Radeon HD 3600 PRO, ATI Radeon HD 3600 XT,
	ATI Mobility Radeon HD 3650, ATI Mobility Radeon HD 3670,
	ATI Mobility FireGL V5700, ATI Mobility FireGL V5725,
	ATI Radeon HD 3200 Graphics, ATI Radeon 3100 Graphics,
	ATI Radeon HD 3300 Graphics, ATI Radeon 3000 Graphics, SUMO, SUMO2,
	ATI Radeon HD 4200, ATI Radeon 4100, ATI Mobility Radeon HD 4200,
	ATI Mobility Radeon 4100, ATI Radeon HD 4290, ATI Radeon HD 4250,
	AMD Radeon HD 6310 Graphics, AMD Radeon HD 6250 Graphics,
	AMD Radeon HD 6300 Series Graphics,
	AMD Radeon HD 6200 Series Graphics, PALM, CYPRESS,
	ATI FirePro (FireGL) Graphics Adapter, AMD Firestream 9370,
	AMD Firestream 9350, ATI Radeon HD 5800 Series,
	ATI Radeon HD 5900 Series, ATI Mobility Radeon HD 5800 Series,
	ATI Radeon HD 5700 Series, ATI Radeon HD 6700 Series,
	ATI Mobility Radeon HD 5000 Series, ATI Mobility Radeon HD 5570,
	ATI Radeon HD 5670, ATI Radeon HD 5570, ATI Radeon HD 5500 Series,
	REDWOOD, ATI Mobility Radeon Graphics, CEDAR, ATI FirePro 2270,
	ATI Radeon HD 5450, CAYMAN, AMD Radeon HD 6900 Series,
	AMD Radeon HD 6900M Series, Mobility Radeon HD 6000 Series, BARTS,
	AMD Radeon HD 6800 Series, AMD Radeon HD 6700 Series, TURKS, CAICOS,
	ARUBA, TAHITI, PITCAIRN, VERDE, OLAND, HAINAN, BONAIRE, KABINI,
	MULLINS, KAVERI, HAWAII

Problem is not critical, but i don’t understand why this happens only during startup of GUI.
Hope someone can help.

Did you try using early kms (/etc/mkinitcpio.conf) ?

Yes i tried early KMS, nothing changed.