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Linux mint Screen flicker issue solve

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Md Ahad Ali
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2 min read

The line you provided modifies the GRUB configuration (/etc/default/grub) to include specific kernel parameters that control various aspects of system behavior, particularly related to power management and display settings. Let's break down what each parameter does and how it affects your system:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash i915.enable_dc=0 intel_idle.max_cstate=2"

1. quiet splash

  • Purpose: These are standard boot parameters that control the boot process display.

    • quiet: Suppresses most of the boot messages, making the boot process less verbose and more visually appealing.

    • splash: Displays a graphical splash screen during the boot process, hiding the text-based output.

2. i915.enable_dc=0

  • Purpose: Disables Display Core (DC) power savings for Intel integrated graphics.

    • What it does: DC power savings reduce the power consumption of the GPU when the display is idle or under low load. However, these features can sometimes cause issues like screen flickering or artifacts.

    • Effect: By setting i915.enable_dc=0, you ensure that the GPU operates at full capacity, which can help prevent flickering or other display issues.

3. intel_idle.max_cstate=2

  • Purpose: Limits the CPU to the C1 and C2 idle states, preventing it from entering deeper sleep states like C3 or C6.

    • What it does: Deeper C-states save more power but can introduce latency when the CPU needs to wake up. Limiting the CPU to C1 and C2 reduces this latency.

    • Effect: This can improve performance for tasks that require quick CPU responsiveness and may also help mitigate screen flickering issues related to CPU idle states.

Summary of Effects

  • quiet splash: Makes the boot process less verbose and displays a graphical splash screen.

  • i915.enable_dc=0: Disables DC power savings for Intel integrated graphics, potentially resolving screen flickering or artifacts.

  • intel_idle.max_cstate=2: Limits the CPU to C1 and C2 idle states, reducing wake-up latency and potentially helping with screen flickering issues.

Applying the Changes

After modifying the /etc/default/grub file with the above line, you need to apply the changes by updating GRUB and rebooting your system. Here are the steps:

  1. Edit the GRUB Configuration:
sudo nano /etc/default/grub
  1. Replace the existing GRUB_CMDLINE_LINUX_DEFAULT line with:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash i915.enable_dc=0 intel_idle.max_cstate=2"
  1. Update GRUB:
sudo update-grub
  1. Reboot the System:
sudo reboot

After rebooting, the new kernel parameters will take effect, and you should see the changes in how your system boots and operates, particularly in terms of power management and display behavior.

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