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@@ -380,3 +380,51 @@ not overwork it to death?
- In [[https://gitlab.freedesktop.org/upower/power-profiles-daemon/-/issues/164][upower/power-profiles-daemon#164]], @Nyan reports problematic iGPU
capping; not convinced this is applicable though, given the reported
symptoms (video playback is fine here).
+
+- Seen reports of Variable Refresh Rate causing problems:
+ - searched high and low to understand why VRR appears nowhere in
+ Plasma settings, despite the start menu turning up "Display
+ Configuration" when searching for "VRR",
+ - mystery solved by ~kscreen-doctor -o~: =Vrr: incapable= 🤷
+
+- [[https://www.techpowerup.com/forums/threads/what-fixed-stuttering-and-random-framerate-spikes-in-games-for-me.327264/][aska33j proclaims]] that /disabling CPPC/ "fixed stuttering and random
+ framerate spikes in games for [them]" so… roundtrip to UEFI,
+ disabling that. The =amd_pstate= warning is back; the "Power
+ Profile" slider is no longer accessible in the systray widget; no
+ discernible effect in-game anyway.
+
+- Looking at Steam forums, [[https://steamcommunity.com/app/1145350/discussions/1/596260472619121965/][some folks]] do report FPS drops /shortly
+ after the update/:
+ #+begin_quote
+ it started fine after the major update, now suddenly im stuck with 40~50 fps with micro sutters
+ — December 6 2024
+ #+end_quote
+****** This is insane
+Selected subset of moving parts; "testability" considering ease of
+clean reverts:
+
+| Part | Testability |
+|--------------+-------------------------------------------------------------------------------------|
+| Linux kernel | 🫣 [[https://en.opensuse.org/SDB:InstallNewerKernel][some distro documentation]]; afraid of side-effects |
+| AMD drivers | 🤷 no clue; maybe inextricable from kernel? |
+| Mesa | 😬 easy to recompile; hard to control transient state in cache & config folders |
+| Steam | 🫥 under Steam's control |
+| Wine | 🫥 under Steam's control |
+| Proton | 👌 as long as I stick to versions under Steam's control; have not considered GE yet |
+| vkd3d-proton | 🫥 under Steam's control |
+| Hades Ⅱ | 🫥 under Steam's control |
+
+That's looking at software packages as individual blackboxes;
+config-wise, worth noting:
+
+| Part | Testability |
+|------------+-------------------|
+| AMD pstate | 😬 UEFI roundtrip |
+| sysfs | OK |
+
+Let's throw in:
+
+| Part | Testability |
+|---------------+-----------------------------------|
+| Mobo firmware | 🔥 reports of nuked boot settings |
+