Intel 915GM. все тормозит на OpenGL

видел неоднократно темы по этому вопросу, но нигде рационального решения для себя так и не нашел.
в общем. да, знаю glxgears не показатель, но всё же, на eselect mesa set i915 1 (classic) максимум - 60фпс, на галиуме - 300-400фпс, но картинка ужасно тормозит.

xorg.conf

Section "ServerLayout"
	Identifier     "X.org Configured"
	Screen      0  "Screen0" 0 0
	InputDevice    "Mouse0" "CorePointer"
	InputDevice    "Keyboard0" "CoreKeyboard"
EndSection

Section "Files"
	ModulePath   "/usr/lib/xorg/modules"
	FontPath     "/usr/share/fonts/misc/"
	FontPath     "/usr/share/fonts/TTF/"
	FontPath     "/usr/share/fonts/OTF/"
	FontPath     "/usr/share/fonts/Type1/"
	FontPath     "/usr/share/fonts/100dpi/"
	FontPath     "/usr/share/fonts/75dpi/"
EndSection

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

Section "InputDevice"
	Identifier  "Keyboard0"
	Driver      "evdev"
	Option      "Xkblayout"   "us, ru, ua"
	Option "XkbOptions"   "grp:alt_shift_toggle,grp_led:scroll"
EndSection

Section "InputDevice"
	Identifier  "Mouse0"
	Driver      "evdev"
	Option	    "Protocol" "auto"
	Option	    "Device" "/dev/input/mose_dev"
	Option	    "ZAxisMapping" "4 5 6 7"
EndSection

Section "Monitor"
	Identifier   "Monitor0"
	VendorName   "Monitor Vendor"
	ModelName    "Monitor Model"
EndSection

Section "Device"
        ### Available Driver options are:-
        ### Values: <i>: integer, <f>: float, <bool>: "True"/"False",
        ### <string>: "String", <freq>: "<f> Hz/kHz/MHz",
        ### <percent>: "<f>%"
        ### [arg]: arg optional
     #  Option "Tiling"        "True"
      Option     "AccelMethod"        	"XAA"
        Option     "DRI"                	"True"
     	Option     "DRI2"  "True"
	#Option     "ColorKey"           	# <i>
        #Option     "VideoKey"           	# <i>
        #Option     "FallbackDebug"      	# [<bool>]
      #  Option     "Tiling"             	"False"
        #Option     "Shadow"             	# [<bool>]
        #Option     "SwapbuffersWait"    	"No"
        #Option     "XvMC"               	# [<bool>]
        #Option     "XvPreferOverlay"    	# [<bool>]
        #Option     "DebugFlushBatches"  	# [<bool>]
        #Option     "DebugFlushCaches"   	# [<bool>]
        #Option     "DebugWait"          	# [<bool>]
        #Option     "HotPlug"            	# [<bool>]
	Identifier  "Card0"
	Driver      "intel"
	BusID       "PCI:0:2:0"
EndSection

Section "Screen"
	Identifier "Screen0"
	Device     "Card0"
	Monitor    "Monitor0"
	SubSection "Display"
		Viewport   0 0
		Depth     1
	EndSubSection
	SubSection "Display"
		Viewport   0 0
		Depth     4
	EndSubSection
	SubSection "Display"
		Viewport   0 0
		Depth     8
	EndSubSection
	SubSection "Display"
		Viewport   0 0
		Depth     15
	EndSubSection
	SubSection "Display"
		Viewport   0 0
		Depth     16
	EndSubSection
	SubSection "Display"
		Viewport   0 0
		Depth     24
	EndSubSection
EndSection

Section "ServerFlags"
Option "AllowEmptyInput"    "False"
Option  "AIGLX" "True"
EndSection

Section "DRI"
  Group 0
  Mode 0666
EndSection

Section "Extensions"
   Option     "Composite"  "Enable"
   Option     "RENDER"     "Enable"
EndSection

.drirc

    <device screen="0" driver="dri2">
        <application name="Default">
            <option name="force_s3tc_enable" value="false" />
            <option name="fthrottle_mode" value="2" />
            <option name="vblank_mode" value="0" />
            <option name="allow_large_textures" value="1" />
            <option name="disable_s3tc" value="true" />
        </application>
        <application name="all" executable="">
            <option name="force_s3tc_enable" value="false" />
            <option name="disable_s3tc" value="true" />
            <option name="fthrottle_mode" value="2" />
            <option name="vblank_mode" value="0" />
            <option name="allow_large_textures" value="2" />
            <option name="disable_s3tc" value="true" />
         </application>
    </device>
</driconf>

Gentoo-Linux Kernel-2.6.38-r6
Mesa-7.10.3
xf86-video-intel-2.14.0
коротче, все самое последнее, потому что поставил систему не так уж и давно. борюсь с этим уже 4 день.
lspci -k | grep

$lspci -k | grep VGA
00:02.0 VGA compatible controller: Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller (rev 03)

помогите, плз.