Frank
02883d3ed2
Copy of the legacy ~/.pi/agent/docs tree rebuilt as the command-center knowledge base: concept files promoted to path identity, index listings stripped of frontmatter, all wikilinks/relative links resolved, every checkable claim verified against the live fleet (Dankserver = Ryzen 7 7700X + RTX 3090; Strix Halo is Dankclaw), unverifiable claims tagged. kb-lint exits 0.
313 lines
7.7 KiB
Markdown
313 lines
7.7 KiB
Markdown
---
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type: guide
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title: Sleep Fix Guide
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description: Fix guide for Alienware M16a2 sleep/wake issues on CachyOS with NVIDIA RTX 40-series GPU.
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tags:
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- research
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- sleep-wake
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- fix
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- nvidia
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timestamp: 2026-01-15
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---
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z
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# Alienware M16a2 Sleep/Wake Fix Guide
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Based on diagnostics from your system (CachyOS, Kernel 7.1.4, NVIDIA RTX 40-series)
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---
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## Problem Summary
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Your system enters sleep when closing the lid, but the screen stays black on wake. Diagnostics show:
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- **Sleep state:** s2idle (Modern Standby) - problematic for NVIDIA hybrid GPUs
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- **NVIDIA services:** Disabled (nvidia-suspend.service, nvidia-resume.service)
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- **Kernel errors:** ACPI D-Notifier failures, spd5118 resume errors
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---
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## Fix #1: Enable NVIDIA Suspend Services (⚠️ MOST IMPORTANT)
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This is the #1 cause of your issue. The NVIDIA GPU state is not being preserved during suspend.
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```bash
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# Enable the NVIDIA suspend/resume services
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sudo systemctl enable nvidia-suspend.service
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sudo systemctl enable nvidia-resume.service
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# Verify they're enabled
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systemctl status nvidia-suspend.service nvidia-resume.service
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```
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**Deterministic verification:**
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```bash
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# This shows "enabled" for both services when the fixes work
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systemctl is-enabled nvidia-suspend.service nvidia-resume.service
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# Expected output: enabled\nenabled
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```
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---
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## Fix #2: Force S3 Deep Sleep (If Available)
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s2idle is fundamentally broken for NVIDIA hybrid GPUs. Try forcing S3 deep sleep:
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```bash
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# Check if S3 is supported
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cat /sys/power/mem_sleep
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# If you see "[s2idle] deep" or "s2idle [deep]", S3 is available
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# Temporarily test S3
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echo deep | sudo tee /sys/power/mem_sleep
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# Test suspend
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systemctl suspend
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# If this works, make it permanent
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```
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**Make S3 permanent:**
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```bash
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# Create systemd override
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sudo mkdir -p /etc/systemd/sleep.d
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sudo tee /etc/systemd/sleep.d/deep-sleep.conf > /dev/null <<'EOF'
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[Sleep]
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MemSleepDefault=deep
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EOF
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# Or add kernel parameter (alternative method)
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# See Fix #4 below
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```
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**Deterministic verification:**
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```bash
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# Should show [deep] instead of [s2idle]
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cat /sys/power/mem_sleep
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```
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**If S3 is NOT available** (you only see `[s2idle]`):
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- Check your BIOS for "Deep Sleep", "S3 Support", or "Sleep State" settings
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- Update BIOS to latest version (Dell often enables S3 in updates)
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- Some newer laptops have S3 disabled in firmware - BIOS update may be required
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---
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## Fix #3: Blacklist nvidiafb Module
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The NVIDIA framebuffer module can cause black screen on resume:
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```bash
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# Create blacklist file
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sudo tee /etc/modprobe.d/blacklist-nvidiafb.conf > /dev/null <<'EOF'
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blacklist nvidiafb
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EOF
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# Regenerate initramfs
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sudo mkinitcpio -P
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# Verify nvidiafb is not loaded
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lsmod | grep nvidiafb
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# Expected: no output
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```
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**Deterministic verification:**
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```bash
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# Should return non-zero (module not found)
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lsmod | grep -q nvidiafb && echo "FAIL: nvidiafb loaded" || echo "PASS: nvidiafb not loaded"
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```
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---
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## Fix #4: Add Kernel Parameters
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Add these parameters to improve ACPI and sleep behavior:
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```bash
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# For GRUB (edit /etc/default/grub):
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# GRUB_CMDLINE_LINUX_DEFAULT="... mem_sleep_default=deep acpi_backlight=vendor"
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# For systemd-boot (edit /boot/loader/entries/*.conf):
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# Add to options line: mem_sleep_default=deep acpi_backlight=vendor
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# For your current setup (check your bootloader):
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# Add these parameters:
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# mem_sleep_default=deep - forces S3 if available
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# acpi_backlight=vendor - fixes backlight control on resume
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# acpi_enforce_resources=lax - allows ACPI resource access
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```
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After editing bootloader config:
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```bash
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# GRUB
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sudo update-grub
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# systemd-boot - no action needed, changes take effect on next boot
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```
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**Deterministic verification:**
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```bash
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# Check if parameters are active
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cat /proc/cmdline | grep -E "mem_sleep_default|acpi_backlight"
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# Should show the parameters you added
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```
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---
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## Fix #5: Disable Problematic Wake Sources
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Your diagnostics show XHCI (USB) and RP01/RP05 (PCIe) wake sources enabled. These can cause issues:
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```bash
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# View current wake sources
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cat /proc/acpi/wakeup
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# Toggle problematic devices (XHCI is common culprit)
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# WARNING: This is temporary - resets on reboot
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sudo sh -c 'echo XHCI > /proc/acpi/wakeup'
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```
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**To make permanent**, create a systemd service:
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```bash
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sudo tee /etc/systemd/system/disable-wake-devices.service > /dev/null <<'EOF'
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[Unit]
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Description=Disable problematic wake devices
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Before=sleep.target
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[Service]
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Type=oneshot
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ExecStart=/bin/sh -c 'echo XHCI > /proc/acpi/wakeup'
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ExecStart=/bin/sh -c 'echo RP01 > /proc/acpi/wakeup'
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ExecStart=/bin/sh -c 'echo RP05 > /proc/acpi/wakeup'
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[Install]
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WantedBy=sleep.target
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EOF
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sudo systemctl enable disable-wake-devices.service
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```
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---
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## Fix #6: Update BIOS/Firmware
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Dell frequently releases BIOS updates that fix ACPI/suspend bugs:
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```bash
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# Check for firmware updates
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sudo fwupdmgr get-updates
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# If updates available:
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sudo fwupdmgr update
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```
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**Deterministic verification:**
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```bash
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# Check current BIOS version
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dmidecode -s bios-version
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dmidecode -s bios-release-date
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# Compare with Dell support site for your M16a2
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```
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---
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## Fix #7: Configure TLP (If Installed)
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If you use TLP for power management, add these settings:
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```bash
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sudo tee -a /etc/tlp.conf > /dev/null <<'EOF'
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# NVIDIA power management
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RUNTIME_PM_ON_AUTO_SUSPEND=auto
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RUNTIME_PM_ON_IDLE_THRESHOLD=30
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# PCI Express ASPM
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PCIE_ASPM_ON_AC=powersupersave
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PCIE_ASPM_ON_BAT=powersupersave
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EOF
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# Restart TLP
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sudo tlp start
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```
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---
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## Testing Procedure
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After applying fixes, test in this order:
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### Test 1: Manual Suspend
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```bash
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# Simple suspend test
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systemctl suspend
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# Expected: System sleeps, wakes properly when you press a key/move mouse
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```
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### Test 2: Lid Close Test
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```bash
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# Check lid trigger setting
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cat /etc/systemd/logind.conf | grep HandleLidSwitch
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# Should be: HandleLidSwitch=suspend
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# Test by physically closing the lid
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# Expected: System sleeps, wakes properly when you open the lid
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```
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### Test 3: Automated Test
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```bash
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# Run 5 suspend/resume cycles
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for i in {1..5}; do
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echo "Cycle $i"
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systemctl suspend
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# Wake up when system suspends
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done
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```
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---
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## Emergency Recovery
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If you get a black screen after wake:
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1. **Try switching TTY:** `Ctrl+Alt+F3` - if this works, it is a display issue
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2. **SSH into the machine** from another device and check logs
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3. **Hard reset:** Hold power button for 10 seconds
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4. **Check logs after reboot:**
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```bash
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journalctl -b -1 -k | grep -iE "suspend|resume|nvidia|acpi"
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```
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---
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## Rollback Plan
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If a fix breaks something:
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1. **NVIDIA services:** `sudo systemctl disable nvidia-suspend.service`
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2. **S3 sleep:** Remove the sleep.d config or kernel parameter
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3. **nvidiafb blacklist:** Remove `/etc/modprobe.d/blacklist-nvidiafb.conf` and regenerate initramfs
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4. **Kernel parameters:** Edit bootloader config to remove parameters
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---
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## Summary of Changes to Apply
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| Fix | Priority | Command |
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| Enable NVIDIA services | ⚠️ CRITICAL | `sudo systemctl enable nvidia-suspend.service nvidia-resume.service` |
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| Blacklist nvidiafb | HIGH | Create `/etc/modprobe.d/blacklist-nvidiafb.conf` + `sudo mkinitcpio -P` |
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| Force S3 sleep | HIGH | `echo deep \| sudo tee /sys/power/mem_sleep` (test first) |
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| Kernel parameters | MEDIUM | Add `mem_sleep_default=deep acpi_backlight=vendor` to bootloader |
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| Update BIOS | MEDIUM | `sudo fwupdmgr get-updates` |
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| Disable wake sources | LOW | Create wake device toggle service |
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---
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## Next Steps
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1. **Start with Fix #1** (enable NVIDIA services) - this is most likely the issue
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2. **Test suspend** after each fix
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3. **Apply Fix #2** if s2idle continues to fail
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4. **Apply Fix #3** (blacklist nvidiafb) - low risk, high reward
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5. **Consider Fix #4** (kernel parameters) if issues persist
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6. **Apply Fix #6** (BIOS update) if available
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After you apply all fixes, sleep and wake work reliably.
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