nvidia: Validate the nvidia_drm module options

When the proprietary nvidia driver is used, ensure the modeset option is
set instead of checking /proc/cmdline for nvidia-drm.modeset=1.

1 files changed, 24 insertions, 0 deletions

diff --git a/sway/main.c b/sway/main.c
index 6d13955c..cc9147b8 100644
--- a/sway/main.c
+++ b/sway/main.c
@@ -135,6 +135,29 @@ void detect_proprietary() {
                                 "You need nvidia, nvidia_modeset, nvidia_uvm, and nvidia_drm."
                                 "\x1B[0m\n");
                 }
+#ifdef __linux__
+                f = fopen("/sys/module/nvidia_drm/parameters/modeset", "r");
+                if (f) {
+                        char *line = read_line(f);
+                        if (line && strstr(line, "Y")) {
+                                // nvidia-drm.modeset is set to 0
+                                fprintf(stderr, "\x1B[1;31mWarning: You must load "
+                                        "nvidia-drm with the modeset option on to use "
+                                        "the proprietary driver. Consider adding "
+                                        "nvidia-drm.modeset=1 to your kernel command line "
+                                        "parameters.\x1B[0m\n");
+                        }
+                        fclose(f);
+                        free(line);
+                } else {
+                        // nvidia-drm.modeset is not set
+                        fprintf(stderr, "\x1B[1;31mWarning: You must load "
+                                "nvidia-drm with the modeset option on to use "
+                                "the proprietary driver. Consider adding "
+                                "nvidia-drm.modeset=1 to your kernel command line "
+                                "parameters.\x1B[0m\n");
+                }
+#else
                 f = fopen("/proc/cmdline", "r");
                 if (f) {
                         char *line = read_line(f);
@@ -146,6 +169,7 @@ void detect_proprietary() {
                         fclose(f);
                         free(line);
                 }
+#endif
         }
 }