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--- ubuntu:gpu:troubleshooting:error_ring_gfx_0.0.0_timeout [2023/06/05 13:10] – peter
+++ ubuntu:gpu:troubleshooting:error_ring_gfx_0.0.0_timeout [2023/06/05 13:22] (current) – peter
@@ Line 24: / Line 24: @@
 Use the **amdgpu.ppfeaturemask** parameter to narrow down which power feature is causing problems.
-  * The bits in that parameter are defined by the PP_FEATURE_MASK enum here: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/gpu/drm/amd/include/amd_shared.h#n199
+  * The bits in that parameter are defined by the **PP_FEATURE_MASK** enum here: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/gpu/drm/amd/include/amd_shared.h#n199
 <code bash>
@@ Line 89: / Line 89: @@
 ----
-Try adding the following to the kernel boot parameters:
+==== Change Kernel Boot Parameters ====
-<code>
+Try adding the **amdgpu.ppfeaturemask** to the kernel boot parameters, **/etc/default/grub**:
-amdgpu.ppfeaturemask=0xfffd3fff
+<file bash /etc/default/grub>
+GRUB_CMDLINE_LINUX_DEFAULT="quiet splash amdgpu.ppfeaturemask=0xfffd3fff"
+</file>
+and update Grub
+<code bash>
+sudo update-grub
 </code>
-And check if the fault happens again.
+Then reboot, and check if the fault happens again.
-It may be that the fault is caused by one or more of those features:
+<WRAP info>
+**NOTE:**  It may be that the fault is caused by one or more of those features:
 <code>
@@ Line 104: / Line 113: @@
 PP_STUTTER_MODE = 0x20000,
 </code>
+</WRAP>
+----
+===== Use Mesa Environment Parameters to identify the cause =====
+Add **RADV_DEBUG=hang** to the **/etc/environment**, then try triggering the fault again.
+This dumps a report to $HOME/radv_dumps_<pid>_<time> if a GPU hang is detected.
+Report the error to the Mesa Team.
+<WRAP info>
+**NOTE:**  See https://docs.mesa3d.org/envvars.html
+</WRAP>
 ----
@@ Line 110: / Line 135: @@
 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/gpu/drm/amd/include/amd_shared.h#n199
+https://docs.mesa3d.org/envvars.html