Add workaround for exit code 1 (auto-cpufreq-gtk) to README.md (#896)

* Update README with auto-cpufreq-gtk workaround

Added workaround for launching auto-cpufreq-gtk with exit code 1.

* Fix auto-cpufreq-gtk launch workaround in README

Updated the workaround for launching auto-cpufreq-gtk to include the correct .desktop file path.

Author: sacredeanne

README.md

@@ -728,9 +728,13 @@ quiet splash initcall_blacklist=amd_pstate_init amd_pstate.enable=0
 
 Once you have made the necessary changes to the `cmdline` file, you can update it by running `sudo reinstall-kernels`.
 
+**Q:** If auto-cpufreq-gtk doesn't launch with exit code 1 (Workaround)
+
+**A:** Try launching it with `env -i XDG_RUNTIME_DIR=$XDG_RUNTIME_DIR auto-cpufreq-gtk` and add it to `/usr/share/applications/auto-cpufreq-gtk.desktop` if it works.
+
 ### AUR
 
-- If the AUR installer does not work for your system, fallback to `auto-cpufreq-installer` and open an issue. 
+- If the AUR installer does not work for your system, fallback to `auto-cpufreq-installer` and open an issue.
 
 ## Discussion: