我遇到一个问题，设置中没有显示所有 RAM，但 BIOS 中显示，所以我知道这不是一块故障内存条。这是运行 21.04 的联想 idea pad slim 3。我没有任何交换。它是低压 DDR4。以前是 8 GB，但现在降到了 5.6。
[sudo] password for harley:
[ 0.005081] check: Scanning 1 areas for low memory corruption
[ 0.005466] ACPI: Reserving FACP table memory at [mem 0xb9576000-0xb957610b]
[ 0.005468] ACPI: Reserving DSDT table memory at [mem 0xb956a000-0xb9572900]
[ 0.005469] ACPI: Reserving FACS table memory at [mem 0xbe621000-0xbe62103f]
[ 0.005470] ACPI: Reserving SSDT table memory at [mem 0xba696000-0xba69b418]
[ 0.005471] ACPI: Reserving MSDM table memory at [mem 0xba157000-0xba157054]
[ 0.005472] ACPI: Reserving BATB table memory at [mem 0xb9f79000-0xb9f79049]
[ 0.005473] ACPI: Reserving HPET table memory at [mem 0xb9575000-0xb9575037]
[ 0.005474] ACPI: Reserving APIC table memory at [mem 0xb9574000-0xb9574107]
[ 0.005475] ACPI: Reserving MCFG table memory at [mem 0xb9573000-0xb957303b]
[ 0.005476] ACPI: Reserving IVRS table memory at [mem 0xb9569000-0xb956913d]
[ 0.005477] ACPI: Reserving SSDT table memory at [mem 0xb9567000-0xb956819b]
[ 0.005478] ACPI: Reserving CRAT table memory at [mem 0xb9566000-0xb956680f]
[ 0.005479] ACPI: Reserving CDIT table memory at [mem 0xb9565000-0xb9565028]
[ 0.005480] ACPI: Reserving SSDT table memory at [mem 0xb9564000-0xb9564539]
[ 0.005481] ACPI: Reserving TPM2 table memory at [mem 0xb9563000-0xb9563037]
[ 0.005482] ACPI: Reserving FPDT table memory at [mem 0xb9562000-0xb9562033]
[ 0.005483] ACPI: Reserving SSDT table memory at [mem 0xb955b000-0xb955c3a5]
[ 0.005484] ACPI: Reserving SSDT table memory at [mem 0xb9559000-0xb955a54d]
[ 0.005485] ACPI: Reserving SSDT table memory at [mem 0xb9556000-0xb9557f43]
[ 0.005486] ACPI: Reserving BGRT table memory at [mem 0xb9555000-0xb9555037]
[ 0.005487] ACPI: Reserving UEFI table memory at [mem 0xbe61f000-0xbe61f165]
[ 0.005488] ACPI: Reserving SSDT table memory at [mem 0xb9561000-0xb9561712]
[ 0.005876] Early memory node ranges
[ 0.021394] PM: hibernation: Registered nosave memory: [mem 0x00000000-0x00000fff]
[ 0.021396] PM: hibernation: Registered nosave memory: [mem 0x0009e000-0x0009ffff]
[ 0.021397] PM: hibernation: Registered nosave memory: [mem 0x000a0000-0x000dffff]
[ 0.021398] PM: hibernation: Registered nosave memory: [mem 0x000e0000-0x000fffff]
[ 0.021400] PM: hibernation: Registered nosave memory: [mem 0x09c00000-0x09cd0fff]
[ 0.021402] PM: hibernation: Registered nosave memory: [mem 0x09f00000-0x09f0afff]
[ 0.021403] PM: hibernation: Registered nosave memory: [mem 0xae680000-0xbc77dfff]
[ 0.021404] PM: hibernation: Registered nosave memory: [mem 0xbc77e000-0xbe77dfff]
[ 0.021405] PM: hibernation: Registered nosave memory: [mem 0xbe77e000-0xbe7fdfff]
[ 0.021406] PM: hibernation: Registered nosave memory: [mem 0xbe7fe000-0xbfffffff]
[ 0.021407] PM: hibernation: Registered nosave memory: [mem 0xc0000000-0xf7ffffff]
[ 0.021408] PM: hibernation: Registered nosave memory: [mem 0xf8000000-0xfbffffff]
[ 0.021408] PM: hibernation: Registered nosave memory: [mem 0xfc000000-0xfd1fffff]
[ 0.021409] PM: hibernation: Registered nosave memory: [mem 0xfd200000-0xfd2fffff]
[ 0.021410] PM: hibernation: Registered nosave memory: [mem 0xfd300000-0xfebfffff]
[ 0.021411] PM: hibernation: Registered nosave memory: [mem 0xfec00000-0xfecfffff]
[ 0.021412] PM: hibernation: Registered nosave memory: [mem 0xfed00000-0xfed7ffff]
[ 0.021413] PM: hibernation: Registered nosave memory: [mem 0xfed80000-0xfed80fff]
[ 0.021413] PM: hibernation: Registered nosave memory: [mem 0xfed81000-0xff7fffff]
[ 0.021414] PM: hibernation: Registered nosave memory: [mem 0xff800000-0xffffffff]
[ 0.088914] Freeing SMP alternatives memory: 40K
[ 0.482744] Freeing initrd memory: 106608K
[ 0.486371] check: Scanning for low memory corruption every 60 seconds
[ 0.797269] Freeing unused decrypted memory: 2036K
[ 0.798068] Freeing unused kernel image (initmem) memory: 2696K
[ 0.869206] Freeing unused kernel image (text/rodata gap) memory: 2036K
[ 0.869327] Freeing unused kernel image (rodata/data gap) memory: 76K
[ 1.303801] [TTM] Zone kernel: Available graphics memory: 2920510 KiB
[ 1.303802] [TTM] Zone dma32: Available graphics memory: 2097152 KiB
[ 1.303924] [drm] amdgpu: 2048M of VRAM memory ready
[ 1.303928] [drm] amdgpu: 3072M of GTT memory ready.
[ 959.360804] PM: Saving platform NVS memory
[ 959.381133] PM: Restoring platform NVS memory
total used free shared buff/cache available
Mem: 5704 2436 132 88 3134 2888
Swap: 0 0 0
我确实有一块集成显卡。