[PATCH] Disable panel self-refresh on AMD GPUs

[Demi Marie Obenour <demiobenour@gmail.com>]

KDE Linux has already done this.  It works around a long-running bug in
the AMD GPU driver, which I believe also affects my test laptop.
Without the workaround, the system freezes and does not recover until a
hard reboot.

Signed-off-by: Demi Marie Obenour <demiobenour@gmail.com>
---
 host/efi.nix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/host/efi.nix b/host/efi.nix
index ecedb6bea6bf29c7a7303dc9062fe12b5c7a9fbd..a832489f3816ca66c2170f0f114a4a8e3a357e32 100644
--- a/host/efi.nix
+++ b/host/efi.nix
@@ -35,6 +35,6 @@ runCommand "spectrum-efi" {
       --linux ${kernel} \
       --initrd ${initramfs} \
       --os-release $'NAME="Spectrum"\n' \
-      --cmdline "ro intel_iommu=on roothash=$roothash"
+      --cmdline "ro intel_iommu=on roothash=$roothash amdgpu.dcdebugmask=0x10"
   ''
 ) (_: {})

---
base-commit: 5b3151fd08d1f1e3e166a328449fe6fe5092f316
change-id: 20260520-disable-panel-self-refresh-6c5e1dc0bab5

-- 
Sincerely,
Demi Marie Obenour (she/her/hers)