Patched my grub boot file GRUB_CMDLINE_LINUX_DEFAULT="quiet splash i915.enable_dc=0 intel_idle.max_cstate=2"
sudo update-grub and restarted machine
Works a treat no more screen flicker after upgrade to 24.04 and several reboots just to be sure fix worked on Dell Insperion 9555 i7 64/16Gb 1Tb Radeon GPU.
I have back tracked to the duplicate bug https:/ /bugs.launchpad .net/bugs/ 1958191 and followed the suggested fix, which was patch grub boot;-
Patched my grub boot file GRUB_CMDLINE_ LINUX_DEFAULT= "quiet splash i915.enable_dc=0 intel_idle. max_cstate= 2"
sudo update-grub and restarted machine
Works a treat no more screen flicker after upgrade to 24.04 and several reboots just to be sure fix worked on Dell Insperion 9555 i7 64/16Gb 1Tb Radeon GPU.