diff --git a/src/detection/gpu/gpu.c b/src/detection/gpu/gpu.c
index bf6cde9b6..7400652ad 100644
--- a/src/detection/gpu/gpu.c
+++ b/src/detection/gpu/gpu.c
@@ -324,7 +324,7 @@ const char* ffDetectGPU(const FFGPUOptions* options, FFlist* result) {
     return "GPU detection failed";
 }
 
-bool ffGPUFillVendorByDeviceName(FFGPUResult* gpu) {
+bool ffGPUDetectTypeByVendorAndName(FFGPUResult* gpu) {
     if (gpu->type != FF_GPU_TYPE_UNKNOWN) {
         return true;
     }
diff --git a/src/detection/gpu/gpu.h b/src/detection/gpu/gpu.h
index 84e1467a1..32b6ff636 100644
--- a/src/detection/gpu/gpu.h
+++ b/src/detection/gpu/gpu.h
@@ -107,4 +107,4 @@ static inline uint64_t ffGPUGeneral2Id(uint64_t originalId) {
     return (1ULL << 63) | originalId;
 }
 
-bool ffGPUFillVendorByDeviceName(FFGPUResult* gpu);
+bool ffGPUDetectTypeByVendorAndName(FFGPUResult* gpu);
diff --git a/src/detection/gpu/gpu_bsd.c b/src/detection/gpu/gpu_bsd.c
index 607cfff3f..f5f8d5800 100644
--- a/src/detection/gpu/gpu_bsd.c
+++ b/src/detection/gpu/gpu_bsd.c
@@ -77,7 +77,7 @@ static const char* detectByPci(const FFGPUOptions* options, FFlist* gpus) {
             }
         }
 
-        ffGPUFillVendorByDeviceName(gpu);
+        ffGPUDetectTypeByVendorAndName(gpu);
     }
 
     return NULL;
diff --git a/src/detection/gpu/gpu_bsddrm.c b/src/detection/gpu/gpu_bsddrm.c
index 7f3a16a00..16283cbe4 100644
--- a/src/detection/gpu/gpu_bsddrm.c
+++ b/src/detection/gpu/gpu_bsddrm.c
@@ -72,7 +72,6 @@ static const char* drmGetPciinfo(int drmfd, const char* drmId, struct drm_pciinf
     };
 
     if (ioctl(pcifd, PCIOCGETCONF, &pcio) < 0) {
-        perror("ioctl");
         return "ioctl(pcifd, PCIOCGETCONF, &pc) failed";
     }
 
@@ -188,7 +187,7 @@ const char* ffGPUDetectByDrmBSD(const FFGPUOptions* options, FFlist* gpus) {
             }
         }
 
-        ffGPUFillVendorByDeviceName(gpu);
+        ffGPUDetectTypeByVendorAndName(gpu);
     }
 
     return NULL;
@@ -201,4 +200,4 @@ const char* ffGPUDetectByDrmBSD(const FFGPUOptions* options, FFlist* gpus) {
     return "Fastfetch was built without libdrm support";
 }
 
-#endif // __FreeBSD__ || __OpenBSD__
+#endif // FF_HAVE_DRM
diff --git a/src/detection/gpu/gpu_drm.c b/src/detection/gpu/gpu_drm.c
index efeb15bfb..b22d0a7a9 100644
--- a/src/detection/gpu/gpu_drm.c
+++ b/src/detection/gpu/gpu_drm.c
@@ -50,7 +50,7 @@ const char* ffDrmDetectRadeon(const FFGPUOptions* options, FFGPUResult* gpu, con
     }
 
     if (ioctl(fd, DRM_IOCTL_RADEON_INFO, &(struct drm_radeon_info) {
-                                             .request = RADEON_INFO_MAX_SCLK, // MHz
+                                             .request = RADEON_INFO_MAX_SCLK, // KHz
                                              .value = (uintptr_t) &value,
                                          }) >= 0) {
         gpu->frequency = (uint32_t) (value / 1000u);
@@ -59,7 +59,7 @@ const char* ffDrmDetectRadeon(const FFGPUOptions* options, FFGPUResult* gpu, con
     if (options->driverSpecific) {
         struct drm_radeon_gem_info gemInfo;
         if (ioctl(fd, DRM_IOCTL_RADEON_GEM_INFO, &gemInfo) >= 0) {
-            // vram_usage can be bigger than vram_usage, so we use vram_size here
+            // vram_usage can be bigger than vram_size, so we use vram_size here
             gpu->dedicated.total = gemInfo.vram_size;
             gpu->shared.total = gemInfo.gart_size;
 
@@ -146,6 +146,7 @@ const char* ffDrmDetectAmdgpu(const FFGPUOptions* options, FFGPUResult* gpu, con
                 ffStrbufAppendF(&gpu->memoryType, "Unknown (%u)", devInfo.vram_type);
                 break;
         }
+    #undef FF_VRAM_CASE
     }
 
     struct drm_amdgpu_memory_info memInfo;
@@ -228,12 +229,12 @@ static inline int popcountBytes(uint8_t* bytes, uint32_t length) {
         length -= 4;
     }
     if (length >= 2) {
-        count += __builtin_popcountl(*(uint16_t*) bytes);
+        count += __builtin_popcount(*(uint16_t*) bytes);
         bytes += 2;
         length -= 2;
     }
     if (length) {
-        count += __builtin_popcountl(*(uint8_t*) bytes);
+        count += __builtin_popcount(*(uint8_t*) bytes);
     }
     return count;
 }
diff --git a/src/detection/gpu/gpu_linux.c b/src/detection/gpu/gpu_linux.c
index 2f96d8ea7..91f6b566d 100644
--- a/src/detection/gpu/gpu_linux.c
+++ b/src/detection/gpu/gpu_linux.c
@@ -7,7 +7,7 @@
 #include <inttypes.h>
 #include <stdint.h>
 
-static bool pciDetectDriver(FFstrbuf* result, FFstrbuf* pciDir, FFstrbuf* buffer, FF_A_UNUSED const char* drmKey) {
+static bool detectDriverFromSysfs(FFstrbuf* result, FFstrbuf* pciDir, FFstrbuf* buffer, FF_A_UNUSED const char* drmKey) {
     uint32_t pciDirLength = pciDir->length;
     ffStrbufAppendS(pciDir, "/driver");
     char pathBuf[PATH_MAX];
@@ -90,6 +90,7 @@ static void pciDetectAmdSpecific(const FFGPUOptions* options, FFGPUResult* gpu,
     ffStrbufAppendS(pciDir, "/hwmon/");
     FF_AUTO_CLOSE_DIR DIR* dirp = opendir(pciDir->chars);
     if (!dirp) {
+        ffStrbufSubstrBefore(pciDir, pciDirLen);
         return;
     }
 
@@ -101,6 +102,7 @@ static void pciDetectAmdSpecific(const FFGPUOptions* options, FFGPUResult* gpu,
         break;
     }
     if (!entry) {
+        ffStrbufSubstrBefore(pciDir, pciDirLen);
         return;
     }
     ffStrbufAppendS(pciDir, entry->d_name);
@@ -407,7 +409,7 @@ static const char* detectPci(const FFGPUOptions* options, FFlist* gpus, FFstrbuf
         ffStrbufSetF(&gpu->platformApi, "DRM (%s)", drmKey);
     }
 
-    pciDetectDriver(&gpu->driver, deviceDir, buffer, drmKey);
+    detectDriverFromSysfs(&gpu->driver, deviceDir, buffer, drmKey);
     ffStrbufSubstrBefore(deviceDir, drmDirPathLength);
 
     if (gpu->vendor.chars == FF_GPU_VENDOR_NAME_AMD) {
@@ -457,7 +459,7 @@ static const char* detectPci(const FFGPUOptions* options, FFlist* gpus, FFstrbuf
         ffGPUFillVendorAndName(subclassId, (uint16_t) vendorId, (uint16_t) deviceId, gpu);
     }
 
-    ffGPUFillVendorByDeviceName(gpu);
+    ffGPUDetectTypeByVendorAndName(gpu);
 
     if (options->driverSpecific && gpu->pcieSpeed == FF_GPU_PCIE_SPEED_UNSET) {
         ffStrbufAppendS(deviceDir, "/max_link_speed");
@@ -535,12 +537,12 @@ static const char* detectOf(FFlist* gpus, FFstrbuf* buffer, FFstrbuf* drmDir, co
     gpu->temperature = FF_GPU_TEMP_UNSET;
     gpu->coreCount = FF_GPU_CORE_COUNT_UNSET;
     gpu->coreUsage = FF_GPU_CORE_USAGE_UNSET;
-    gpu->type = FF_GPU_TYPE_INTEGRATED;
+    gpu->type = FF_GPU_TYPE_INTEGRATED; // Open Firmware is only used on integrated GPUs
     gpu->dedicated.total = gpu->dedicated.used = gpu->shared.total = gpu->shared.used = FF_GPU_VMEM_SIZE_UNSET;
     gpu->frequency = FF_GPU_FREQUENCY_UNSET;
     gpu->pcieSpeed = FF_GPU_PCIE_SPEED_UNSET;
 
-    pciDetectDriver(&gpu->driver, drmDir, buffer, drmKey);
+    detectDriverFromSysfs(&gpu->driver, drmDir, buffer, drmKey);
 
 #ifdef __aarch64__
     if (ffStrbufEqualS(&gpu->driver, "asahi")) {
@@ -557,7 +559,7 @@ static const char* detectOf(FFlist* gpus, FFstrbuf* buffer, FFstrbuf* drmDir, co
             ffStrbufSetStatic(&gpu->vendor, "Broadcom"); // Raspberry Pi
         } else {
             ffStrbufSetS(&gpu->vendor, compatible);
-            gpu->vendor.chars[0] = (char) toupper(compatible[0]);
+            gpu->vendor.chars[0] = (char) toupper((uint8_t) compatible[0]);
         }
     }
 
@@ -586,10 +588,11 @@ static const char* drmDetectGPUs(const FFGPUOptions* options, FFlist* gpus) {
         ffStrbufAppendS(&drmDir, entry->d_name);
 
         ffStrbufAppendS(&drmDir, "/device/modalias");
-        if (!ffReadFileBuffer(drmDir.chars, &buffer)) {
+        ffReadFileBuffer(drmDir.chars, &buffer);
+        ffStrbufSubstrBefore(&drmDir, drmDir.length - (uint32_t) strlen("/modalias"));
+        if (!buffer.length) {
             continue;
         }
-        ffStrbufSubstrBefore(&drmDir, drmDir.length - (uint32_t) strlen("/modalias"));
 
         if (ffStrbufStartsWithS(&buffer, "pci:")) {
             detectPci(options, gpus, &buffer, &drmDir, entry->d_name);
diff --git a/src/detection/gpu/gpu_windows.c b/src/detection/gpu/gpu_windows.c
index 44b68ff31..589fee4e1 100644
--- a/src/detection/gpu/gpu_windows.c
+++ b/src/detection/gpu/gpu_windows.c
@@ -225,7 +225,7 @@ static void ffStrbufSetWS(FFstrbuf* strbuf, const char16_t* str) {
 static void closeDxgfd(void) {
     if (dxgfd >= 0) {
         close(dxgfd);
-        dxgfd = 0;
+        dxgfd = -2;
         FF_DEBUG("Closed /dev/dxg file descriptor");
     }
 }
@@ -294,7 +294,7 @@ ffGPUDetectWsl2
         });
         if (!NT_SUCCESS(status)) {
             FF_DEBUG("KMTQAITYPE_ADAPTERTYPE query failed for adapter #%u: %s", i, ffDebugNtStatus(status));
-            continue;
+            goto close_adapter;
         }
         if (adapterType.SoftwareDevice) {
             FF_DEBUG("Skipping software adapter #%u", i);
@@ -607,7 +607,7 @@ ffGPUDetectWsl2
         }
 
         if (gpu->type == FF_GPU_TYPE_UNKNOWN) {
-            if (ffGPUFillVendorByDeviceName(gpu)) {
+            if (ffGPUDetectTypeByVendorAndName(gpu)) {
                 // OK
             }
 #if _WIN32