启动 Ubuntu 20.04 后，我的华硕笔记本电脑（华硕 A53T 系列）的内部显示屏关闭。一切正常，但在 grub 引导加载程序之后，内部显示屏关闭并永远保持关闭状态。
我认为问题在于显示器背光只是关闭了，因为当我连接外接显示器时，我可以观察到以下情况：
- 我可以启动操作系统并登录。
- 外部显示器显示原始分辨率。
- 内部显示屏为黑色（背光也不亮）。
- 当我打开显示设置时，我看到：
- 两个显示器（内部和外部均被正确检测，具有正确的显示分辨率和显示器标签）均显示为已激活（已打开）
- 桌面大小分布在两个屏幕上（我可以用光标移动到黑色的内部屏幕，但我看不到任何东西）
- 此观察适用于使用 Wayland 或 XOrg 以及使用 Gnome3 或 Mate 桌面。
我尝试了几个命令试图打开内部显示，但没有效果（例如xset dpms force on）
当我使用附加内核参数启动操作系统时radeon.modeset=0，内部显示器可以工作，但它没有原始分辨率，也无法连接外部显示器。我不想长期使用这种安全图形模式。
我也尝试了其他不同的内核参数：
- 使用
radeon.runpm=0without 可以radeon.modeset=0消除一些dmesg错误，并且 GUI 可以通过外部显示器更快地启动，但尽管如此，什么也没有改变 ivrs_ioapic[32]=00:14.0 spec_store_bypass_disable=prctl并没有改变现状acpi=off apm=off没有解决它nomodeset没有解决它nouveau.modeset=0没有解决它amdgpu.exp_hw_support=1没有解决它noacpi acpi=off没有解决它radeon.drm=0没有解决它
进一步说明
- 第一个 Ubuntu 16.04 版本开箱即用，带有内置显示器。此外，还可以连接并同时使用 VGA 显示器。
- Ubuntu 16.04.6 不再工作，行为如上所述
- Ubuntu 18.04 不再起作用，并且表现如上所述
我该怎么做才能解决这个问题？在我看来，如果我可以“只”打开内部显示屏的背光，这个问题就可以解决了。我认为，这样一切都会好起来的。
- 瘦身
description: Notebook
product: K53TA
vendor: ASUSTeK Computer Inc.
version: 1.0
serial: xxx
width: 64 bits
capabilities: smbios-2.7 dmi-2.7 smp vsyscall32
configuration: boot=normal chassis=notebook family=K uuid=0BB3197F-B373-11E0-A18C-14DAE9A007CB
*-core
description: Motherboard
product: K53TA
vendor: ASUSTeK Computer Inc.
physical id: 0
version: 1.0
serial: xxx
slot: To be filled by O.E.M.
*-firmware
description: BIOS
vendor: American Megatrends Inc.
physical id: 0
version: 206
date: 07/20/2011
size: 64KiB
capacity: 1MiB
capabilities: pci upgrade shadowing cdboot bootselect socketedrom edd int13floppy1200 int13floppy720 int13floppy2880 int5printscreen int9keyboard int14serial int17printer acpi usb biosbootspecification uefi
*-memory
description: System Memory
physical id: 22
slot: System board or motherboard
size: 8GiB
*-bank:0
description: DIMM DDR3 Synchronous 1333 MHz (0.8 ns)
product: ASU1333S9-4G-ECEWG
vendor: Kingston
physical id: 0
serial: 26364634
slot: A1_DIMM0
size: 4GiB
width: 64 bits
clock: 1333MHz (0.8ns)
*-bank:1
description: DIMM DDR3 Synchronous 1333 MHz (0.8 ns)
product: ASU1333S9-4G-ECEWG
vendor: Kingston
physical id: 1
serial: 8C360336
slot: A1_DIMM1
size: 4GiB
width: 64 bits
clock: 1333MHz (0.8ns)
*-cache:0
description: L1 cache
physical id: 2c
slot: L1 CACHE
size: 512KiB
capacity: 512KiB
clock: 1GHz (1.0ns)
capabilities: pipeline-burst internal write-back unified
configuration: level=1
*-cache:1
description: L2 cache
physical id: 2d
slot: L2 CACHE
size: 4MiB
capacity: 4MiB
clock: 1GHz (1.0ns)
capabilities: pipeline-burst internal write-back unified
configuration: level=2
*-cpu
description: CPU
product: AMD A6-3400M APU with Radeon(tm) HD Graphics
vendor: Advanced Micro Devices [AMD]
physical id: 34
bus info: cpu@0
version: AMD A6-3400M APU with Radeon(tm) HD Graphics
slot: P0
size: 1400MHz
capacity: 1400MHz
width: 64 bits
clock: 100MHz
capabilities: lm fpu fpu_exception wp vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp x86-64 3dnowext 3dnow constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid aperfmperf pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt cpb hw_pstate vmmcall arat npt lbrv svm_lock nrip_save pausefilter
configuration: cores=4 enabledcores=4 threads=4
*-pci:0
description: Host bridge
product: Family 12h Processor Root Complex
vendor: Advanced Micro Devices, Inc. [AMD]
physical id: 100
bus info: pci@0000:00:00.0
version: 00
width: 32 bits
clock: 66MHz
configuration: latency=32
*-display
description: VGA compatible controller
product: BeaverCreek [Radeon HD 6520G]
vendor: Advanced Micro Devices, Inc. [AMD/ATI]
physical id: 1
bus info: pci@0000:00:01.0
version: 00
width: 32 bits
clock: 33MHz
capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
configuration: driver=radeon latency=0
resources: irq:34 memory:b0000000-bfffffff ioport:f000(size=256) memory:feb00000-feb3ffff memory:c0000-dffff
*-multimedia:0
description: Audio device
product: BeaverCreek HDMI Audio [Radeon HD 6500D and 6400G-6600G series]
vendor: Advanced Micro Devices, Inc. [AMD/ATI]
physical id: 1.1
bus info: pci@0000:00:01.1
version: 00
width: 32 bits
clock: 33MHz
capabilities: pm pciexpress msi bus_master cap_list
configuration: driver=snd_hda_intel latency=0
resources: irq:36 memory:feb44000-feb47fff
[...]
*-display
description: VGA compatible controller
product: Whistler [Radeon HD 6630M/6650M/6750M/7670M/7690M]
vendor: Advanced Micro Devices, Inc. [AMD/ATI]
physical id: 0
bus info: pci@0000:01:00.0
version: 00
width: 64 bits
clock: 33MHz
capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
configuration: driver=radeon latency=0
resources: irq:35 memory:c0000000-cfffffff memory:fea20000-fea3ffff ioport:e000(size=256) memory:fea00000-fea1ffff
[...]
- CPU信息
processor : 0
vendor_id : AuthenticAMD
cpu family : 18
model : 1
model name : AMD A6-3400M APU with Radeon(tm) HD Graphics
stepping : 0
microcode : 0x3000027
cpu MHz : 860.192
cache size : 1024 KB
physical id : 0
siblings : 4
core id : 0
cpu cores : 4
apicid : 0
initial apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 6
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid aperfmperf pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt cpb hw_pstate vmmcall arat npt lbrv svm_lock nrip_save pausefilter
bugs : fxsave_leak sysret_ss_attrs null_seg spectre_v1 spectre_v2
bogomips : 2794.91
TLB size : 1536 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management: ts ttp tm stc 100mhzsteps hwpstate cpb
processor : 1
vendor_id : AuthenticAMD
cpu family : 18
model : 1
model name : AMD A6-3400M APU with Radeon(tm) HD Graphics
stepping : 0
microcode : 0x3000027
cpu MHz : 858.983
cache size : 1024 KB
physical id : 0
siblings : 4
core id : 1
cpu cores : 4
apicid : 1
initial apicid : 1
fpu : yes
fpu_exception : yes
cpuid level : 6
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid aperfmperf pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt cpb hw_pstate vmmcall arat npt lbrv svm_lock nrip_save pausefilter
bugs : fxsave_leak sysret_ss_attrs null_seg spectre_v1 spectre_v2
bogomips : 2794.91
TLB size : 1536 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management: ts ttp tm stc 100mhzsteps hwpstate cpb
processor : 2
vendor_id : AuthenticAMD
cpu family : 18
model : 1
model name : AMD A6-3400M APU with Radeon(tm) HD Graphics
stepping : 0
microcode : 0x3000027
cpu MHz : 874.440
cache size : 1024 KB
physical id : 0
siblings : 4
core id : 2
cpu cores : 4
apicid : 2
initial apicid : 2
fpu : yes
fpu_exception : yes
cpuid level : 6
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid aperfmperf pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt cpb hw_pstate vmmcall arat npt lbrv svm_lock nrip_save pausefilter
bugs : fxsave_leak sysret_ss_attrs null_seg spectre_v1 spectre_v2
bogomips : 2794.91
TLB size : 1536 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management: ts ttp tm stc 100mhzsteps hwpstate cpb
processor : 3
vendor_id : AuthenticAMD
cpu family : 18
model : 1
model name : AMD A6-3400M APU with Radeon(tm) HD Graphics
stepping : 0
microcode : 0x3000027
cpu MHz : 969.754
cache size : 1024 KB
physical id : 0
siblings : 4
core id : 3
cpu cores : 4
apicid : 3
initial apicid : 3
fpu : yes
fpu_exception : yes
cpuid level : 6
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm 3dnowext 3dnow constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid aperfmperf pni monitor cx16 popcnt lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt cpb hw_pstate vmmcall arat npt lbrv svm_lock nrip_save pausefilter
bugs : fxsave_leak sysret_ss_attrs null_seg spectre_v1 spectre_v2
bogomips : 2794.91
TLB size : 1536 4K pages
clflush size : 64
cache_alignment : 64
address sizes : 40 bits physical, 48 bits virtual
power management: ts ttp tm stc 100mhzsteps hwpstate cpb
- 已加载 radeon 固件
sudo dmesg | grep -E 'drm|radeon' | grep -iE 'firmware|microcode'
[sudo] password for xxx:
[ 4.643875] [drm] Loading SUMO Microcode
[ 4.643932] radeon 0000:00:01.0: firmware: direct-loading firmware radeon/SUMO_pfp.bin
[ 4.643956] radeon 0000:00:01.0: firmware: direct-loading firmware radeon/SUMO_me.bin
[ 4.643976] radeon 0000:00:01.0: firmware: direct-loading firmware radeon/SUMO_rlc.bin
[ 4.644235] radeon 0000:00:01.0: firmware: direct-loading firmware radeon/SUMO_uvd.bin
[ 5.744564] [drm] Loading TURKS Microcode
[ 5.744624] radeon 0000:01:00.0: firmware: direct-loading firmware radeon/TURKS_pfp.bin
[ 5.744650] radeon 0000:01:00.0: firmware: direct-loading firmware radeon/TURKS_me.bin
[ 5.744677] radeon 0000:01:00.0: firmware: direct-loading firmware radeon/BTC_rlc.bin
[ 5.744710] radeon 0000:01:00.0: firmware: direct-loading firmware radeon/TURKS_mc.bin
[ 5.744745] radeon 0000:01:00.0: firmware: direct-loading firmware radeon/TURKS_smc.bin
- 串行通信
00:00.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 12h Processor Root Complex
00:01.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] BeaverCreek [Radeon HD 6520G]
00:01.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] BeaverCreek HDMI Audio [Radeon HD 6500D and 6400G-6600G series]
00:02.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] Family 12h Processor Root Port
00:04.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] Family 12h Processor Root Port
00:05.0 PCI bridge: Advanced Micro Devices, Inc. [AMD] Family 12h Processor Root Port
00:10.0 USB controller: Advanced Micro Devices, Inc. [AMD] FCH USB XHCI Controller (rev 03)
00:11.0 SATA controller: Advanced Micro Devices, Inc. [AMD] FCH SATA Controller [AHCI mode] (rev 40)
00:12.0 USB controller: Advanced Micro Devices, Inc. [AMD] FCH USB OHCI Controller (rev 11)
00:12.2 USB controller: Advanced Micro Devices, Inc. [AMD] FCH USB EHCI Controller (rev 11)
00:14.0 SMBus: Advanced Micro Devices, Inc. [AMD] FCH SMBus Controller (rev 13)
00:14.2 Audio device: Advanced Micro Devices, Inc. [AMD] FCH Azalia Controller (rev 01)
00:14.3 ISA bridge: Advanced Micro Devices, Inc. [AMD] FCH LPC Bridge (rev 11)
00:14.4 PCI bridge: Advanced Micro Devices, Inc. [AMD] FCH PCI Bridge (rev 40)
00:14.7 SD Host controller: Advanced Micro Devices, Inc. [AMD] FCH SD Flash Controller
00:18.0 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 12h/14h Processor Function 0 (rev 43)
00:18.1 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 12h/14h Processor Function 1
00:18.2 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 12h/14h Processor Function 2
00:18.3 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 12h/14h Processor Function 3
00:18.4 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 12h/14h Processor Function 4
00:18.5 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 12h/14h Processor Function 6
00:18.6 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 12h/14h Processor Function 5
00:18.7 Host bridge: Advanced Micro Devices, Inc. [AMD] Family 12h/14h Processor Function 7
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Whistler [Radeon HD 6630M/6650M/6750M/7670M/7690M]
02:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 06)
03:00.0 Network controller: Qualcomm Atheros AR9285 Wireless Network Adapter (PCI-Express) (rev 01)
- 兰德
Screen 0: minimum 320 x 200, current 3046 x 1050, maximum 8192 x 8192
VGA-0 connected primary 1680x1050+0+0 (normal left inverted right x axis y axis) 474mm x 296mm
1680x1050 59.95*+
1600x1200 60.00
1400x1050 59.98
1280x1024 75.02 60.02
1440x900 59.89
1280x960 60.00
1152x864 75.00
1024x768 75.03 70.07 60.00
832x624 74.55
800x600 72.19 75.00 60.32 56.25
640x480 75.00 72.81 66.67 59.94
720x400 70.08
LVDS connected 1366x768+1680+0 (normal left inverted right x axis y axis) 344mm x 194mm
1366x768 60.01*+
1280x720 59.97
1152x768 59.95
1024x768 59.95
800x600 59.96
848x480 59.94
720x480 59.94
640x480 59.94
HDMI-0 disconnected (normal left inverted right x axis y axis)