我在新安装的 Debian 8 的图形配置方面遇到了一些问题：HTML Canvas、视频、游戏等都非常慢。
我花了一些时间尝试修复xorg.conf文件中的内容，但它没有改变任何 atm 。
这是我的文件的设备部分xorg.conf：
Section "Device"
Identifier "Intel Graphics"
Driver "modesetting"
Option "AccelMethod" "glamor"
BusID "PCI:0:2:0"
EndSection
我得到这个glxinfo：
OpenGL vendor string: VMware, Inc.
OpenGL renderer string: Gallium 0.4 on llvmpipe (LLVM 3.5, 256 bits)
OpenGL version string: 3.0 Mesa 10.3.2
OpenGL shading language version string: 1.30
我在文件中找到相关信息Xorg.log：
[ 1.689] (II) Module ABI versions:
[ 1.689] X.Org ANSI C Emulation: 0.4
[ 1.689] X.Org Video Driver: 18.0
[ 1.689] X.Org XInput driver : 21.0
[ 1.689] X.Org Server Extension : 8.0
[ 1.689] (II) xfree86: Adding drm device (/dev/dri/card0)
[ 2.427] (--) PCI:*(0:0:2:0) 8086:5912:1458:d000 rev 4, Mem @ 0xee000000/16777216, 0xd0000000/268435456, I/O @ 0x0000f000/64, BIOS @ 0x????????/131072
[ 2.428] (II) "glx" will be loaded. This was enabled by default and also specified in the config file.
[ 2.428] (II) LoadModule: "glx"
[ 2.430] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so
[ 2.436] (II) Module glx: vendor="X.Org Foundation"
[ 2.436] compiled for 1.16.4, module version = 1.0.0
[ 2.436] ABI class: X.Org Server Extension, version 8.0
[ 2.436] (==) AIGLX enabled
[ 2.436] (II) LoadModule: "dri2"
[ 2.436] (II) Module "dri2" already built-in
[ 2.436] (II) LoadModule: "glamoregl"
[ 2.436] (II) Loading /usr/lib/xorg/modules/libglamoregl.so
[ 2.445] (II) Module glamoregl: vendor="X.Org Foundation"
[ 2.445] compiled for 1.16.4, module version = 1.0.0
[ 2.445] ABI class: X.Org ANSI C Emulation, version 0.4
[ 2.445] (II) LoadModule: "modesetting"
[ 2.445] (II) Loading /usr/lib/xorg/modules/drivers/modesetting_drv.so
[ 2.446] (II) Module modesetting: vendor="X.Org Foundation"
[ 2.446] compiled for 1.16.4, module version = 0.9.0
[ 2.446] Module class: X.Org Video Driver
[ 2.446] ABI class: X.Org Video Driver, version 18.0
[ 2.446] (II) modesetting: Driver for Modesetting Kernel Drivers: kms
...
[ 3.916] (==) modesetting(0): Backing store enabled
[ 3.916] (==) modesetting(0): Silken mouse enabled
[ 3.916] (II) modesetting(0): RandR 1.2 enabled, ignore the following RandR disabled message.
[ 3.977] (==) modesetting(0): DPMS enabled
[ 3.977] (WW) modesetting(0): Option "AccelMethod" is not used
[ 4.077] (--) RandR disabled
[ 4.087] (II) SELinux: Disabled on system
[ 4.088] (II) AIGLX: Screen 0 is not DRI2 capable
[ 4.088] (EE) AIGLX: reverting to software rendering
[ 4.150] (II) AIGLX: Loaded and initialized swrast
[ 4.150] (II) GLX: Initialized DRISWRAST GL provider for screen 0
这是我的内核版本：4.11.0-trunk-amd64 #1 SMP Debian 4.11-1~exp2 (2017-05-05) x86_64 GNU/Linux
感谢您的帮助，如果您愿意，请随时回答更多详细信息。
编辑：更新到 Debian 9 解决了这个问题