我遇到了一个问题。我的 GPU 是 Intel HD4400 和 AMD Radeon HD8670m。安装 Ubuntu 16.04 和 Linux 内核 4.10.8（此版本支持我的 GPU）后，我发现我的独立 GPU 未被使用。以下是和的lspci | grep VGA输出lspci | grep Display：
xpuska@xpuska-Inspiron-3537:~/Downloads/amdgpu-pro-16.60-379184$ lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation Haswell-ULT Integrated Graphics Controller (rev 09)
xpuska@xpuska-Inspiron-3537:~/Downloads/amdgpu-pro-16.60-379184$ lspci | grep Display
03:00.0 Display controller: Advanced Micro Devices, Inc. [AMD/ATI] Sun XT [Radeon HD 8670A/8670M/8690M / R5 M330] (rev ff)
输出dmesg | egrep "radeon|drm"：
[ 3.346584] [drm] Initialized
[ 3.389738] [drm] radeon kernel modesetting enabled.
[ 3.394605] radeon 0000:03:00.0: enabling device (0000 -> 0003)
[ 3.394784] [drm] initializing kernel modesetting (HAINAN 0x1002:0x6660 0x1028:0x05EA 0x00).
[ 3.394796] [drm] register mmio base: 0xC0500000
[ 3.394797] [drm] register mmio size: 262144
[ 3.394998] [drm] Memory usable by graphics device = 2048M
[ 3.395003] fb: switching to inteldrmfb from EFI VGA
[ 3.395167] [drm] Replacing VGA console driver
[ 3.405777] radeon 0000:03:00.0: VRAM: 2048M 0x0000000000000000 - 0x000000007FFFFFFF (2048M used)
[ 3.405778] radeon 0000:03:00.0: GTT: 2048M 0x0000000080000000 - 0x00000000FFFFFFFF
[ 3.405782] [drm] Detected VRAM RAM=2048M, BAR=256M
[ 3.405783] [drm] RAM width 64bits DDR
[ 3.405852] [drm] radeon: 2048M of VRAM memory ready
[ 3.405852] [drm] radeon: 2048M of GTT memory ready.
[ 3.405861] [drm] Loading hainan Microcode
[ 3.405948] [drm] Internal thermal controller without fan control
[ 3.406013] [drm] probing gen 2 caps for device 8086:9c18 = 5323c42/0
[ 3.407903] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 3.407904] [drm] Driver supports precise vblank timestamp query.
[ 3.418125] [drm] radeon: dpm initialized
[ 3.418131] [drm] GART: num cpu pages 524288, num gpu pages 524288
[ 3.419452] [drm] probing gen 2 caps for device 8086:9c18 = 5323c42/0
[ 3.419456] [drm] PCIE gen 2 link speeds already enabled
[ 3.422412] [drm] PCIE GART of 2048M enabled (table at 0x0000000000040000).
[ 3.422541] radeon 0000:03:00.0: WB enabled
[ 3.422543] radeon 0000:03:00.0: fence driver on ring 0 use gpu addr 0x0000000080000c00 and cpu addr 0xffff8a2f4ee39c00
[ 3.422544] radeon 0000:03:00.0: fence driver on ring 1 use gpu addr 0x0000000080000c04 and cpu addr 0xffff8a2f4ee39c04
[ 3.422546] radeon 0000:03:00.0: fence driver on ring 2 use gpu addr 0x0000000080000c08 and cpu addr 0xffff8a2f4ee39c08
[ 3.422547] radeon 0000:03:00.0: fence driver on ring 3 use gpu addr 0x0000000080000c0c and cpu addr 0xffff8a2f4ee39c0c
[ 3.422548] radeon 0000:03:00.0: fence driver on ring 4 use gpu addr 0x0000000080000c10 and cpu addr 0xffff8a2f4ee39c10
[ 3.422549] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 3.422549] [drm] Driver supports precise vblank timestamp query.
[ 3.422550] radeon 0000:03:00.0: radeon: MSI limited to 32-bit
[ 3.422603] radeon 0000:03:00.0: radeon: using MSI.
[ 3.422627] [drm] radeon: irq initialized.
[ 3.665095] [drm] ring test on 0 succeeded in 1 usecs
[ 3.665100] [drm] ring test on 1 succeeded in 1 usecs
[ 3.665105] [drm] ring test on 2 succeeded in 1 usecs
[ 3.665113] [drm] ring test on 3 succeeded in 4 usecs
[ 3.665120] [drm] ring test on 4 succeeded in 4 usecs
[ 3.665336] [drm] ib test on ring 0 succeeded in 0 usecs
[ 3.665390] [drm] ib test on ring 1 succeeded in 0 usecs
[ 3.665441] [drm] ib test on ring 2 succeeded in 0 usecs
[ 3.665484] [drm] ib test on ring 3 succeeded in 0 usecs
[ 3.665525] [drm] ib test on ring 4 succeeded in 0 usecs
[ 3.665900] [drm] Radeon Display Connectors
[ 3.667334] [drm] Initialized radeon 2.49.0 20080528 for 0000:03:00.0 on minor 0
[ 3.684899] [drm] Initialized i915 1.6.0 20161121 for 0000:00:02.0 on minor 1
[ 3.685209] [drm] amdgpu kernel modesetting enabled.
[ 3.703713] fbcon: inteldrmfb (fb0) is primary device
[ 4.797500] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
[ 15.678225] [drm] probing gen 2 caps for device 8086:9c18 = 5323c42/0
[ 15.678239] [drm] PCIE gen 2 link speeds already enabled
[ 15.684288] [drm] PCIE GART of 2048M enabled (table at 0x0000000000040000).
[ 15.684399] radeon 0000:03:00.0: WB enabled
[ 15.684401] radeon 0000:03:00.0: fence driver on ring 0 use gpu addr 0x0000000080000c00 and cpu addr 0xffff8a2f4ee39c00
[ 15.684402] radeon 0000:03:00.0: fence driver on ring 1 use gpu addr 0x0000000080000c04 and cpu addr 0xffff8a2f4ee39c04
[ 15.684403] radeon 0000:03:00.0: fence driver on ring 2 use gpu addr 0x0000000080000c08 and cpu addr 0xffff8a2f4ee39c08
[ 15.684404] radeon 0000:03:00.0: fence driver on ring 3 use gpu addr 0x0000000080000c0c and cpu addr 0xffff8a2f4ee39c0c
[ 15.684405] radeon 0000:03:00.0: fence driver on ring 4 use gpu addr 0x0000000080000c10 and cpu addr 0xffff8a2f4ee39c10
[ 15.925963] [drm] ring test on 0 succeeded in 1 usecs
[ 15.925969] [drm] ring test on 1 succeeded in 1 usecs
[ 15.925973] [drm] ring test on 2 succeeded in 1 usecs
[ 15.925982] [drm] ring test on 3 succeeded in 4 usecs
[ 15.925988] [drm] ring test on 4 succeeded in 4 usecs
[ 15.926019] [drm] ib test on ring 0 succeeded in 0 usecs
[ 15.926043] [drm] ib test on ring 1 succeeded in 0 usecs
[ 15.926066] [drm] ib test on ring 2 succeeded in 0 usecs
[ 15.926080] [drm] ib test on ring 3 succeeded in 0 usecs
[ 15.926097] [drm] ib test on ring 4 succeeded in 0 usecs
[ 23.229928] [drm] probing gen 2 caps for device 8086:9c18 = 5323c42/0
[ 23.229932] [drm] PCIE gen 2 link speeds already enabled
[ 23.236038] [drm] PCIE GART of 2048M enabled (table at 0x0000000000040000).
[ 23.236136] radeon 0000:03:00.0: WB enabled
[ 23.236138] radeon 0000:03:00.0: fence driver on ring 0 use gpu addr 0x0000000080000c00 and cpu addr 0xffff8a2f4ee39c00
[ 23.236139] radeon 0000:03:00.0: fence driver on ring 1 use gpu addr 0x0000000080000c04 and cpu addr 0xffff8a2f4ee39c04
[ 23.236140] radeon 0000:03:00.0: fence driver on ring 2 use gpu addr 0x0000000080000c08 and cpu addr 0xffff8a2f4ee39c08
[ 23.236141] radeon 0000:03:00.0: fence driver on ring 3 use gpu addr 0x0000000080000c0c and cpu addr 0xffff8a2f4ee39c0c
[ 23.236142] radeon 0000:03:00.0: fence driver on ring 4 use gpu addr 0x0000000080000c10 and cpu addr 0xffff8a2f4ee39c10
[ 23.475035] [drm] ring test on 0 succeeded in 1 usecs
[ 23.475041] [drm] ring test on 1 succeeded in 1 usecs
[ 23.475046] [drm] ring test on 2 succeeded in 1 usecs
[ 23.475054] [drm] ring test on 3 succeeded in 4 usecs
[ 23.475061] [drm] ring test on 4 succeeded in 4 usecs
[ 23.475121] [drm] ib test on ring 0 succeeded in 0 usecs
[ 23.475175] [drm] ib test on ring 1 succeeded in 0 usecs
[ 23.475229] [drm] ib test on ring 2 succeeded in 0 usecs
[ 23.475243] [drm] ib test on ring 3 succeeded in 0 usecs
[ 23.475273] [drm] ib test on ring 4 succeeded in 0 usecs
抱歉我的英语不好。
答案1
我是 ubuntu 新手，遇到的问题和你类似。我的笔记本电脑上同时安装了 Intel HD 4000 和 AMD Radeon HD8670m。
经过一番研究，你可以强制 ubuntu 使用 DRI_PRIME 的 AMD 显卡运行程序/游戏
DRI_PRIME=1 ./EXECUTIBLE_PROGRAM
有趣的是，当我使用 glmark2 检查性能时，使用下面的代码，我的 Intel HD 4000 的性能比我的 AMD 显卡好得多
sudo apt-get glmark2
DRI_PRIME=0 glmark2
DRI_PRIME=1 glmark2
我在英特尔的成绩是 2000，而在 AMD 的成绩只有 700。