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--- notes:kernel_parameters [2019/11/17 14:48] – Sean Rhone
+++ notes:kernel_parameters [2019/11/30 22:02] – Sean Rhone
@@ Line 2: / Line 2: @@
   * Kernel parameters that were useful at some point in time
-====== Old GRUB Settings ======
-  * :!: Use ''grubby'' instead unless it doesn't exist by-default
-===== UEFI =====
-****
-  sudo -e '/etc/default/grub' && sudo grub2-mkconfig -o '/boot/efi/EFI/fedora/grub.cfg'
-===== Legacy =====
-****
-  sudo -e '/etc/default/grub' && sudo grub2-mkconfig -o '/boot/grub2/grub.cfg'
 ====== Kernel Options ======
@@ Line 44: / Line 28: @@
 ===== Microcode and Security Patches =====
-  * https://access.redhat.com/articles/3311301
   * :!: This disables all protection
-  spectre_v2=off nopti
+  mitigations=off
 ===== Modern Standby =====
@@ Line 64: / Line 47: @@
 ===== intel_iommu =====
-****
+  * :!: Check ''dmesg'' for any DMAR-related errors
   intel_iommu=on
 ===== i915 =====
+==== Safe ====
+  i915.enable_fbc=1
+  i915.fastboot=1
+==== Hardware-specific ====
   * GuC firmware loading/submission **requires** PAVP to be enabled in BIOS
-  * ''enable_guc'' nor ''enable_psr'' work on a Lenovo T500 ThinkPad
+  * :!: TODO: Figure out how to test PSR
   i915.enable_psr=1
@@ Line 96: / Line 87: @@
   drm.debug=0xe
+===== amdgpu =====
+  * Allows use of Overdrive options for overclocking
+  amdgpu.ppfeaturemask=0xffffffff
+==== Verify ====
+****
+  cat '/sys/module/amdgpu/parameters/ppfeaturemask' | grep '4294967295'
+===== PCI =====
+  * May be useful for eGPU and Thunderbolt limits on Macs
+  pci=nocrs,pcie_bus_perf
 ===== Reboot =====