LPIC-2 Linux Kernel and System Startup Practice Question
This LPIC-2 practice question tests your understanding of linux kernel and system startup. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A data center administrator is troubleshooting a server that hangs during boot after a kernel update. The server uses UEFI and GRUB 2. The administrator observes that the server displays the GRUB menu, selects the new kernel entry, but then the screen goes blank and the system does not respond. The administrator can boot the previous kernel from the GRUB menu successfully. Which of the following is the most likely cause of this issue?
Clue words in this question
Noticing these words before you look at the options changes how you read each choice.
Clue: "most likely"
Why it matters: Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The new kernel includes a graphics driver that conflicts with the hardware, causing the display to blank
Option D is correct because the blank screen after selecting the new kernel, while the old kernel works, strongly indicates a graphics driver conflict. In GRUB 2 with UEFI, the kernel may switch from the UEFI framebuffer to a native graphics driver (e.g., nouveau, i915, amdgpu) that fails to initialize on the specific hardware, causing the display to go blank. The system is not truly hung; it continues booting without console output, which is a known issue with incompatible or buggy kernel graphics drivers.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
The initramfs for the new kernel was not generated
Why it's wrong here
Missing initramfs typically results in a kernel panic with a VFS error, not a blank screen.
✗
Secure Boot is enabled and the new kernel is not signed
Why it's wrong here
Secure Boot signature issues prevent the kernel from loading altogether, usually with an error message.
✗
The new kernel's root= parameter points to an invalid device
Why it's wrong here
An invalid root parameter would cause a kernel panic with a mount error, not a blank screen.
✓
The new kernel includes a graphics driver that conflicts with the hardware, causing the display to blank
Why this is correct
A common cause of blank screen after GRUB is a framebuffer or graphics driver issue, often resolved by adding 'nomodeset' to the kernel command line.
Clue confirmation
The clue word "most likely" in the question point toward this answer.
Related concept
Read the scenario before looking for a memorised answer.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often assume a blank screen means the kernel didn't load at all, leading them to choose Secure Boot or initramfs issues, but the fact that the old kernel works and the new kernel is selected from GRUB points to a driver-level failure after kernel handoff.
Detailed technical explanation
How to think about this question
Under the hood, the kernel's DRM (Direct Rendering Manager) subsystem initializes the graphics hardware and may disable the UEFI GOP framebuffer. If the driver fails (e.g., due to missing firmware, incorrect PCI IDs, or a regression), the console remains uninitialized, leaving the screen blank. A common workaround is to add 'nomodeset' to the kernel command line, which forces the kernel to use the UEFI framebuffer and avoid native driver initialization. This issue is frequently seen with NVIDIA proprietary drivers after a kernel update that requires recompilation of the kernel module.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Linux Kernel and System Startup — This question tests Linux Kernel and System Startup — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The new kernel includes a graphics driver that conflicts with the hardware, causing the display to blank — Option D is correct because the blank screen after selecting the new kernel, while the old kernel works, strongly indicates a graphics driver conflict. In GRUB 2 with UEFI, the kernel may switch from the UEFI framebuffer to a native graphics driver (e.g., nouveau, i915, amdgpu) that fails to initialize on the specific hardware, causing the display to go blank. The system is not truly hung; it continues booting without console output, which is a known issue with incompatible or buggy kernel graphics drivers.
What should I do if I get this LPIC-2 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Are there clue words in this question I should notice?
Yes — watch for: "most likely". Probability qualifier — the question wants the most probable cause or outcome, not a guaranteed one. Eliminate low-probability options.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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