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--- bios:setup_var_mods:dell_latitude_5591_1.32 [2024/06/01 21:48] – Sean Rhone
+++ bios:setup_var_mods:dell_latitude_5591_1.32 [2025/09/11 06:43] (current) – external edit 127.0.0.1
@@ Line 3: / Line 3: @@
   * Dell Latitude 5591 ((theoretically may work for Precision 3530 and Latitude 5491 since they share the same BIOS file))
   * 2024/06/01: BIOS 1.32
+  * :!: 2024/09/25: Something (presumably PCI-related) causes ''iwlwifl'' to firmware-crash
-===== Process =====
-  * CSME System Tools v12 r38
-  * https://github.com/BoringBoredom/UEFI-Editor/blob/master/README.md#how-to-change-hidden-settings-without-flashing-a-modded-bios
-  FPTW64.exe -d BIOS-dump.bin -BIOS
-====== Bad Settings ======
-===== Audio DSP =====
-  * Enable/Disable Audio DSP
-  * :!: Audio DSP is unusable on Linux with SOF with Intel MEI disabled
-  * Default: Disabled ''0''
-  * Ideal: Enabled ''1''
-  setup_var_cv Setup 0xF48 0x1 0x1
-===== Audio DSP Compliance Mode =====
-  * Specifies DSP enabled system compliance:
-  * 1. Non-UAA (IntelSST driver support only)
-  * 2. UAA (HD Audio Inbox or IntelSST driver support)
-  * :!: Audio DSP is unusable on Linux with SOF with Intel MEI disabled
-  * Default: UAA (HDA Inbox/IntelSST) ''1''
-  * Ideal: UAA (HDA Inbox/IntelSST) ''1''
-  setup_var_cv Setup 0xF49 0x1 0x1
 ====== Overclocking Lock ======
@@ Line 100: / Line 68: @@
   setup_var_cv Setup 0xA7E 0x1 0x0
-====== CSM Support ======
-  * Enable/Disable CSM Support
-  * Default: Enabled ''1''
-  * Ideal: Disabled ''0''
-  setup_var_cv Setup 0x11A6 0x1 0x0
-====== Serial Port ======
-  * Default: COM1 ''2''
-  * Ideal: Disabled ''0''
-  setup_var_cv Setup 0x13DD 0x1 0x0
-====== Maximum GT frequency ======
-  * Default: Default Max Frequency ''255''
-  * Ideal: 1200Mhz ''24''
-  setup_var_cv Setup 0x82B 0x1 0x18
-====== FCLK Frequency for Early Power On ======
-  * FCLK frequency can take values of 400MHz, 800MHz  and 1GHz
-  * (1GHz not supported for ULT/ULX SKUs)
-  * Default: Normal (800MHz) ''0''
-  * Ideal: 1GHz ''1''
-  setup_var_cv Setup 0x66F 0x1 0x1
 ====== Max TOLUD ======
@@ Line 139: / Line 74: @@
   * Dynamic assignment would adjust TOLUD automatically based on largest MMIO length of installed graphic controller
-  * Default: EFI Driver ''1''
+  * :!: TODO: Check this for 1.33
-  * Ideal: Auto ''0''
-  setup_var_cv Setup 0x10D0 0x1 0x0
+  * Default: Unknown
-====== VGA Support ======
-  * If Auto, only install Legacy OpRom with Legacy OS and logo would NOT be shown during post.
-  * Efi driver will still be installed with EFI OS.
-  * Default: Dynamic ''0''
-  * Ideal: 3.5 GB ''11''
-  setup_var_cv Setup 0x90E 0x1 0xB
-====== Use RST Legacy OROM ======
-  * Use RST Legacy OROM when CSM is Enabled
-  * :?: Test if this allows Legacy booting on NVMe
-  * Default: Disabled ''0''
-  * Ideal: Enabled ''1''
-  setup_var_cv Setup 0xA7A 0x1 0x1
-====== Intel Rapid Recovery Technology ======
-  * Enable/Disable Intel Rapid Recovery Technology
-  * Default: Enabled ''1''
-  * Ideal: Disabled ''0''
-  setup_var_cv Setup 0xA72 0x1 0x0
+  setup_var_cv Setup 0x90E 0x1 0x0
 ====== RC6(Render Standby) ======
@@ Line 191: / Line 98: @@
   setup_var_cv Setup 0x5F4 0x1 0x0
-====== PROCHOT Lock ======
-  * Enable/Disable PROCHOT Lock
-  * Default: Enabled ''1''
-  * Ideal: Disabled ''0''
-  setup_var_cv Setup 0x5F7 0x1 0x0
-====== PCI Delay Optimization ======
-  * Experimental ACPI additions for FW latency optimizations
-  * Default: Disabled ''0''
-  * Ideal: Enabled ''1''
-  setup_var_cv Setup 0xD 0x1 0x1
-====== BIOS Guard ======
-  * Configure BIOS Guard feature
-  * :!: This may cause BIOS updates to fail when it tries to update BIOS Guard
-  * Default: Enabled ''1''
-  * Ideal: Disabled ''0''
-  setup_var_cv Setup 0x1177 0x1 0x0
 ====== Panel Scaling ======
@@ Line 228: / Line 107: @@
   setup_var_cv Setup 0x81A 0x1 0x1
-====== PCIe Spread Spectrum Clocking ======
-  * Allows disableing Spread Spectrum Clocking for compliance testing ((typo is verbatim))
-  * Default: Enabled ''0''
-  * Ideal: Disabled ''1''
-  setup_var_cv Setup 0x84D 0x1 0x0
 ====== WatchDog ======
@@ Line 246: / Line 116: @@
   setup_var_cv Setup 0x7D1 0x1 0x0
-====== High Precision Timer ======
-  * Enable or Disable the High Precision Event Timer
-  * Default: Enabled ''1''
-  * Ideal: Disabled ''0''
-  setup_var_cv Setup 0xA0A 0x1 0x0
 ====== DMI Link ASPM Control ======
@@ Line 270: / Line 131: @@
   * Enable/Disable the control of Active State Power Management on SA side of the DMI Link
+  * :?: SA is System Agent?
   * Default: L0sL1 ''3''
@@ Line 275: / Line 137: @@
   setup_var_cv Setup 0x900 0x1 0x0
+====== DMI Max Link Speed ======
+  * Set DMI Speed Gen1/Gen2/Gen3
+  * Default: Auto ''0''
+  * Ideal: Gen3 ''3''
+  setup_var_cv Setup 0x8DE 0x1 0x3
 ====== Linux UV Test ======
@@ Line 283: / Line 154: @@
   * https://github.com/mihic/linux-intel-undervolt
   * https://github.com/erpalma/throttled/blob/master/throttled.py
+  * https://github.com/DivyanshuVerma/throttlestop-linux (prochot)
 ===== CPU Core =====