Why did CSM make boot fail after 3+ years of no problems?

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glitchathon
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Why did CSM make boot fail after 3+ years of no problems?

Post by glitchathon » Sun Feb 03, 2019 9:15 pm

Hello!
I have an Asus H170 motherboard that has been running Linux Mint 18 for 3+ years no problem with no BIOS changes. CSM has been enabled, despite booting in EFI mode.

For the past several months, I did not do any major software changes and simply applied the recommended updates in the update manager. Yesterday, it could not boot and went straight to a black screen. You can see the saga in this thread.

I was unable to troubleshoot and since I had all my data backed up and wanted to try a newer version, I wiped the drive and installed Linux Mint 19.1.

I then had the SAME problem! I then went into the BIOS and tried every setting. I discovered that CSM was the culprit. As soon as I disabled it, it was fine and the PC is running great.

But why? After so many years, why did CSM make my boot fail? And is there a bigger underlying problem? I cannot disable Secure Boot in the BIOS. Not sure if there is a driver or something causing secure boot to fail and try to switch over to legacy boot, but if so, why does disabling CSM help?

I am trying to understand where exactly it was failing so I can better understand it. Any insight would be appreciated! Thank you!

Hoser Rob
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Re: Why did CSM make boot fail after 3+ years of no problems?

Post by Hoser Rob » Mon Feb 04, 2019 8:19 am

Don't know, what level do you have enabled in Update Manager?

And there's no proper system info there, copy/paste this to the terminal and copy/paste the text output here:

Code: Select all

inxi -Fxz

glitchathon
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Posts: 85
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Re: Why did CSM make boot fail after 3+ years of no problems?

Post by glitchathon » Mon Feb 04, 2019 10:58 am

Hoser Rob wrote:
Mon Feb 04, 2019 8:19 am
Don't know, what level do you have enabled in Update Manager?

And there's no proper system info there, copy/paste this to the terminal and copy/paste the text output here:

Code: Select all

inxi -Fxz
Thanks for the reply. I had Level 3 set in my Mint 18 install, as it was the default. Now, mine on Mint 19.1 is set to Level 4.

Here is the output to that command:

Code: Select all

System:    Host: mintmate Kernel: 4.15.0-45-generic x86_64 bits: 64 compiler: gcc v: 7.3.0 Desktop: MATE 1.20.1 
           Distro: Linux Mint 19.1 Tessa base: Ubuntu 18.04 bionic 
Machine:   Type: Desktop Mobo: ASUSTeK model: H170M-PLUS v: Rev X.0x serial: <filter> UEFI: American Megatrends v: 1805 
           date: 06/21/2016 
CPU:       Topology: Quad Core model: Intel Core i5-6600 bits: 64 type: MCP arch: Skylake-S rev: 3 L2 cache: 6144 KiB 
           flags: lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 26496 
           Speed: 800 MHz min/max: 800/3900 MHz Core speeds (MHz): 1: 800 2: 800 3: 800 4: 800 
Graphics:  Device-1: Intel HD Graphics 530 vendor: ASUSTeK driver: i915 v: kernel bus ID: 00:02.0 
           Display: x11 server: X.Org 1.19.6 driver: modesetting unloaded: fbdev,vesa resolution: 2560x1440~60Hz 
           OpenGL: renderer: Mesa DRI Intel HD Graphics 530 (Skylake GT2) v: 4.5 Mesa 18.2.2 direct render: Yes 
Audio:     Device-1: Intel Sunrise Point-H HD Audio vendor: ASUSTeK driver: snd_hda_intel v: kernel bus ID: 00:1f.3 
           Sound Server: ALSA v: k4.15.0-45-generic 
Network:   Device-1: Intel Ethernet I219-V vendor: ASUSTeK driver: e1000e v: 3.2.6-k port: f040 bus ID: 00:1f.6 
           IF: enp0s31f6 state: up speed: 1000 Mbps duplex: full mac: <filter> 
Drives:    Local Storage: total: 4.78 TiB used: 2.43 TiB (50.9%) 
           ID-1: /dev/sda vendor: Samsung model: SSD 850 EVO M.2 250GB size: 232.89 GiB 
           ID-2: /dev/sdb vendor: Western Digital model: WD10JPVX-22JC3T0 size: 931.51 GiB 
           ID-3: /dev/sdc vendor: HGST (Hitachi) model: HMS5C4040BLE640 size: 3.64 TiB 
Partition: ID-1: / size: 227.74 GiB used: 23.76 GiB (10.4%) fs: ext4 dev: /dev/sda2 
Sensors:   System Temperatures: cpu: 29.8 C mobo: 27.8 C 
           Fan Speeds (RPM): cpu: 0 
Info:      Processes: 218 Uptime: 19h 53m Memory: 15.56 GiB used: 1.46 GiB (9.4%) Init: systemd runlevel: 5 Compilers: 
           gcc: 7.3.0 Shell: bash v: 4.4.19 inxi: 3.0.27 

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