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Исправление iZEN, (текущая версия) :

видео стоит в системе - Gallium 0.4 on AMD RS880

В каком направлении рыть?

В направлении избавления от Gallium 0.4, очевидно.

У меня тоже AMD RS790/RS880: 

> dmesg | grep RS880
info: [drm] Loading RS780/RS880 Microcode
Заведён Xorg с драйвером xf86-video-ati-6.14.3 и вот таким вот xorg.conf:
> cat /etc/X11/xorg.conf
Section "ServerLayout"
	Identifier     "X.org Configured"
	Screen      0  "Screen0" 0 0
	InputDevice    "Mouse0" "CorePointer"
	InputDevice    "Keyboard0" "CoreKeyboard"
EndSection

Section "Files"
	ModulePath   "/usr/local/lib/xorg/modules"
	FontPath     "/usr/local/lib/X11/fonts/misc/"
	FontPath     "/usr/local/lib/X11/fonts/TTF/"
	FontPath     "/usr/local/lib/X11/fonts/OTF"
	FontPath     "/usr/local/lib/X11/fonts/Type1/"
	FontPath     "/usr/local/lib/X11/fonts/100dpi/"
	FontPath     "/usr/local/lib/X11/fonts/75dpi/"
	FontPath     "/usr/local/lib/X11/fonts/dejavu/"
	FontPath     "/usr/local/lib/X11/fonts/ChromeOS/"
EndSection

Section "Module"
	Load  "extmod"
	Load  "record"
	Load  "dbe"
	Load  "dri"
	Load  "dri2"
	Load  "freetype"
EndSection

Section "InputDevice"
	Identifier  "Keyboard0"
	Driver      "kbd"
	Option      "XkbLayout" "us,ru"
	Option      "XkbVariant" ",winkeys"
	Option      "XkbOptions" "grp:caps_toggle,grp_led:caps,compose:ralt,terminate:ctrl_alt_bksp"
EndSection

Section "InputDevice"
	Identifier  "Mouse0"
	Driver      "mouse"
	Option	    "Protocol" "auto"
	Option	    "Device" "/dev/sysmouse"
	Option	    "ZAxisMapping" "4 5 6 7"
EndSection

Section "ServerFlags"
	Option "AutoAddDevices" "false"
	Option "AllowEmptyInput" "off"
	Option "AllowMouseOpenFail" "true"
	Option "IgnoreABI" "on"
	Option "AIGLX" "true"
EndSection

Section "Monitor"
	Identifier   "Monitor0"
	VendorName   "HWP"
	ModelName    "HP LP2475w"
	HorizSync    30.0 - 94.0
	VertRefresh  48.0 - 85.0
	Option	    "DPMS"
EndSection

Section "Modes"
	Identifier "Mode0"
EndSection 

Section "Device"
	Option     "AccelMethod"        "XAA"
	Identifier  "Card0"
	Driver      "ati"
	VendorName  "ATI Technologies Inc"
	BoardName   "RS880 [Radeon HD 4200]"
EndSection

Section "Screen"
	Identifier "Screen0"
	Device     "Card0"
	Monitor    "Monitor0"
	SubSection "Display"
		Viewport   0 0
		Depth     24
		Modes   "1920x1200"
	EndSubSection
EndSection

Section "DRI"
	Mode	0666
EndSection

Section "Extensions"
	Option "Composite" "true"
	Option "DAMAGE" "true"
	Option "RENDER" "true"
EndSection

Исходная версия iZEN, :

видео стоит в системе - Gallium 0.4 on AMD RS880

В каком направлении рыть?

В направлении избавления от Gallium 0.4, очевидно.

У меня тоже AMD RS790/RS880: [code> dmesg | grep RS880 info: [drm] Loading RS780/RS880 Microcode] Заведён Xorg с драйвером xf86-video-ati-6.14.3 и вот таким вот xorg.conf:

> cat /etc/X11/xorg.conf
Section "ServerLayout"
	Identifier     "X.org Configured"
	Screen      0  "Screen0" 0 0
	InputDevice    "Mouse0" "CorePointer"
	InputDevice    "Keyboard0" "CoreKeyboard"
EndSection

Section "Files"
	ModulePath   "/usr/local/lib/xorg/modules"
	FontPath     "/usr/local/lib/X11/fonts/misc/"
	FontPath     "/usr/local/lib/X11/fonts/TTF/"
	FontPath     "/usr/local/lib/X11/fonts/OTF"
	FontPath     "/usr/local/lib/X11/fonts/Type1/"
	FontPath     "/usr/local/lib/X11/fonts/100dpi/"
	FontPath     "/usr/local/lib/X11/fonts/75dpi/"
	FontPath     "/usr/local/lib/X11/fonts/dejavu/"
	FontPath     "/usr/local/lib/X11/fonts/ChromeOS/"
EndSection

Section "Module"
	Load  "extmod"
	Load  "record"
	Load  "dbe"
	Load  "dri"
	Load  "dri2"
	Load  "freetype"
EndSection

Section "InputDevice"
	Identifier  "Keyboard0"
	Driver      "kbd"
	Option      "XkbLayout" "us,ru"
	Option      "XkbVariant" ",winkeys"
	Option      "XkbOptions" "grp:caps_toggle,grp_led:caps,compose:ralt,terminate:ctrl_alt_bksp"
EndSection

Section "InputDevice"
	Identifier  "Mouse0"
	Driver      "mouse"
	Option	    "Protocol" "auto"
	Option	    "Device" "/dev/sysmouse"
	Option	    "ZAxisMapping" "4 5 6 7"
EndSection

Section "ServerFlags"
	Option "AutoAddDevices" "false"
	Option "AllowEmptyInput" "off"
	Option "AllowMouseOpenFail" "true"
	Option "IgnoreABI" "on"
	Option "AIGLX" "true"
EndSection

Section "Monitor"
	Identifier   "Monitor0"
	VendorName   "HWP"
	ModelName    "HP LP2475w"
	HorizSync    30.0 - 94.0
	VertRefresh  48.0 - 85.0
	Option	    "DPMS"
EndSection

Section "Modes"
	Identifier "Mode0"
EndSection 

Section "Device"
	Option     "AccelMethod"        "XAA"
	Identifier  "Card0"
	Driver      "ati"
	VendorName  "ATI Technologies Inc"
	BoardName   "RS880 [Radeon HD 4200]"
EndSection

Section "Screen"
	Identifier "Screen0"
	Device     "Card0"
	Monitor    "Monitor0"
	SubSection "Display"
		Viewport   0 0
		Depth     24
		Modes   "1920x1200"
	EndSubSection
EndSection

Section "DRI"
	Mode	0666
EndSection

Section "Extensions"
	Option "Composite" "true"
	Option "DAMAGE" "true"
	Option "RENDER" "true"
EndSection