https://bugzilla.kernel.org/show_bug.cgi?id=216163 Bug ID: 216163 Summary: cstates: intel_idle.max_cstate=4 required to eliminate flickering of the display on the laptop model 3Logic Group Graviton N15i-K2 Product: Drivers Version: 2.5 Kernel Version: v5.18 Hardware: All OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: Platform_x86 Assignee: drivers_platform_x86@xxxxxxxxxxxxxxxxxxxx Reporter: kovalev@xxxxxxxxxxxx Regression: No Created attachment 301249 --> https://bugzilla.kernel.org/attachment.cgi?id=301249&action=edit Limiting the list of states for the model processor INTEL_FAM6_KABYLAKE_L After booting the system almost immediately (it takes less than 1 minute), there are short-term shutdowns of the display (up to 3 seconds). The problem disappears if I load the kernel with the parameter intel_idle.max_cstate=4. While debugging the kernel, I determined that the processor model ID is 0x8E, defined a macro in the header file /arch/x86/include/asm/intel-family.h : ... #define INTEL_FAM6_KABYLAKE_L 0x8E /* Sky Lake */ /* AMBERLAKE_L 0x8E Sky Lake -- s: 9 */ /* COFFEELAKE_L 0x8E Sky Lake -- s: 10 */ /* WHISKEYLAKE_L 0x8E Sky Lake -- s: 11,12 */ ... And I created a patch with a reduced number of states (4 states) of downtime for this model, which works successfully. I am attaching a patch and asking you to consider the feasibility of such a solution. -- You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.
