查看双显卡切换情况，正常情况下如果没有在用独显应该显示是DynOff，但是我这里即使是不开桌面也是DynPwr
[ ~ ] cat /sys/kernel/debug/vgaswitcheroo/switch0:DIS-Audio: :DynPwr:0000:01:00.11:IGD:+:Pwr:0000:00:02.02:DIS: :DynPwr:0000:01:00.0查看dmesg找到
[ 3.495606] [drm] amdgpu kernel modesetting enabled.[ 3.495628] vga_switcheroo: detected switching method \_SB_.PCI0.GFX0.ATPX handle[ 3.495741] ATPX version 1, functions 0x00000033[ 3.495873] ATPX Hybrid Graphics找到了调用的方法，网上搜了一圈都没有使用方法，然后使用acpi_call尝试了几个参数，最后找到
echo "\_SB_.PCI0.GFX0.ATPX 2 0" > /proc/acpi/call嗯，确实有用，但是实在是太暴力了，直接把整个显卡移除，可以看一下日志
[drm:amdgpu_pci_remove [amdgpu]] *ERROR* Hotplug removal is not supported[11499.551786] [drm] amdgpu: finishing device.[11499.554123] CP HQD IQ timer status time out[11499.554442] CP HQD dequeue request time out[11503.557688] cp queue preemption time out.[11503.557729] Creating topology SYSFS entries[11503.557800] amdgpu: [powerplay] ..... ..... ..... failed to send message 84 ret is 65535 [11503.793030] amdgpu: [powerplay] Failed to force to switch arbf0![11503.928787] amdgpu 0000:01:00.0: [drm:amdgpu_ring_test_helper [amdgpu]] *ERROR* ring kiq_2.1.0 test failed (-110)[11503.928865] [drm:gfx_v8_0_hw_fini [amdgpu]] *ERROR* KCQ disable failed[11504.164622] cp is busy, skip halt cp[11504.282335] rlc is busy, skip halt rlc[11504.421048] ------------[ cut here ]------------[11504.421115] WARNING: CPU: 3 PID: 167022 at drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c:3170 amdgpu_vm_manager_fini+0x1e/0x50 [amdgpu][11504.421115] Modules linked in: acpi_call(OE) ccm rfcomm cmac algif_hash algif_skcipher af_alg bnep btusb btrtl btbcm btintel bluetooth snd_hda_codec_realtek snd_hda_codec_generic ledtrig_audio hid_generic usbhid hid ecdh_generic ecc mousedev amdgpu uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_common x86_pkg_temp_thermal intel_powerclamp coretemp videodev kvm_intel mc kvm nls_iso8859_1 nls_cp437 vfat fat i915 iwlmvm fuse irqbypass mac80211 crct10dif_pclmul gpu_sched crc32_pclmul snd_hda_codec_hdmi libarc4 ghash_clmulni_intel snd_hda_intel ttm hp_wmi snd_intel_dspcfg i2c_algo_bit snd_hda_codec mei_hdcp intel_rapl_msr wmi_bmof sparse_keymap iTCO_wdt iTCO_vendor_support aesni_intel crypto_simd joydev iwlwifi cryptd snd_hda_core glue_helper snd_hwdep intel_cstate snd_pcm drm_kms_helper intel_uncore intel_rapl_perf snd_timer cfg80211 input_leds psmouse pcspkr snd i2c_i801 cec r8169 rc_core intel_gtt realtek syscopyarea sysfillrect processor_thermal_device sysimgblt mei_me[11504.421137] libphy intel_rapl_common rfkill int340x_thermal_zone soundcore intel_pch_thermal fb_sys_fops intel_soc_dts_iosf mei wmi battery hp_accel evdev lis3lv02d mac_hid hp_wireless int3400_thermal acpi_thermal_rel ac vboxnetflt(OE) vboxnetadp(OE) drm vboxdrv(OE) crypto_user agpgart ip_tables x_tables ext4 crc32c_generic crc16 mbcache jbd2 rtsx_pci_sdmmc serio_raw mmc_core atkbd libps2 crc32c_intel xhci_pci xhci_hcd rtsx_pci i8042 serio[11504.421149] CPU: 3 PID: 167022 Comm: kworker/u8:0 Tainted: G W OE 5.6.15-arch1-1 #1[11504.421150] Hardware name: HP OMEN by HP Laptop/82EA, BIOS F.53 12/12/2019[11504.421153] Workqueue: kacpi_hotplug acpi_hotplug_work_fn[11504.421221] RIP: 0010:amdgpu_vm_manager_fini+0x1e/0x50 [amdgpu][11504.421222] Code: c7 83 a0 4e 00 00 00 00 00 00 eb 87 0f 1f 44 00 00 55 48 89 fd 48 81 c7 a8 4e 00 00 48 83 ec 08 48 83 bd b0 4e 00 00 00 74 14 <0f> 0b e8 4b 3d a3 d5 48 89 ef 48 83 c4 08 5d e9 ce 96 00 00 31 f6[11504.421223] RSP: 0018:ffffb45703ae3c90 EFLAGS: 00010286[11504.421225] RAX: 0000000000000000 RBX: ffff8c0f0cdc0000 RCX: 0000000000000000[11504.421225] RDX: ffff8c0f1c718000 RSI: ffff8c0f0cb53000 RDI: ffff8c0f0cdc4ea8[11504.421226] RBP: ffff8c0f0cdc0000 R08: 0000000000000040 R09: 0000000000000000[11504.421227] R10: 0000000000000000 R11: ffff8c0f08056438 R12: 0000000000000001[11504.421228] R13: ffff8c0f0cdd5020 R14: ffff8c0f1c0de800 R15: ffff8c0f1c09f740[11504.421229] FS: 0000000000000000(0000) GS:ffff8c0f1ed80000(0000) knlGS:0000000000000000[11504.421230] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033[11504.421230] CR2: 00007f5a4f135fd8 CR3: 00000001a020a001 CR4: 00000000003606e0[11504.421231] Call Trace:[11504.421300] gmc_v8_0_sw_fini+0x16/0x60 [amdgpu][11504.421386] amdgpu_device_fini+0x255/0x46f [amdgpu][11504.421446] amdgpu_driver_unload_kms+0x47/0x90 [amdgpu][11504.421463] drm_dev_unregister+0x4b/0xb0 [drm][11504.421521] amdgpu_pci_remove+0x2e/0x50 [amdgpu][11504.421525] pci_device_remove+0x3b/0xa0[11504.421528] __device_release_driver+0x15c/0x210[11504.421529] device_release_driver+0x24/0x30[11504.421532] pci_stop_bus_device+0x68/0x90[11504.421534] pci_stop_and_remove_bus_device+0xe/0x20[11504.421536] disable_slot+0x49/0x90[11504.421538] acpiphp_check_bridge.part.0+0xba/0x140[11504.421540] acpiphp_hotplug_notify+0x170/0x280[11504.421541] ? acpiphp_post_dock_fixup+0xe0/0xe0[11504.421544] acpi_device_hotplug+0x9e/0x410[11504.421547] acpi_hotplug_work_fn+0x3d/0x50[11504.421549] process_one_work+0x1da/0x3d0[11504.421551] worker_thread+0x4d/0x3e0[11504.421553] ? rescuer_thread+0x3f0/0x3f0[11504.421555] kthread+0x117/0x130[11504.421556] ? __kthread_bind_mask+0x60/0x60[11504.421559] ret_from_fork+0x35/0x40[11504.421562] ---[ end trace 9fc85d768333e4aa ]---[11504.434382] Move buffer fallback to memcpy unavailable[11504.434384] [TTM] Buffer eviction failed[11504.434384] [TTM] Cleanup eviction failed[11504.434402] [TTM] Finalizing pool allocator[11504.434881] [TTM] Finalizing DMA pool allocator[11504.434971] [TTM] Zone kernel: Used memory at exit: 4312 KiB[11504.434974] [TTM] Zone dma32: Used memory at exit: 0 KiB[11504.434976] [drm] amdgpu: ttm finalized[11504.434989] vga_switcheroo: disabled[11504.435496] i915 0000:00:02.0: vgaarb: changed VGA decodes: olddecodes=none,decodes=io+mem:owns=io+mem所以买笔记本一定要买有linux认证的电脑，即使不是也尽量不要买双显卡了，我买的这个显卡基本闲置，我也不喜欢打游戏，反而耗电。
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