diff --git a/src/86box.c b/src/86box.c
index 16c99851a..6fb7541a7 100644
--- a/src/86box.c
+++ b/src/86box.c
@@ -175,6 +175,7 @@ int scrnsz_y = SCREEN_RES_Y;		/* current screen size, Y */
 int	config_changed;				/* config has changed */
 int	title_update;
 int	framecountx = 0;
+int	hard_reset_pending = 0;
 
 
 int	unscaled_size_x = SCREEN_RES_X;	/* current unscaled size X */
@@ -856,9 +857,7 @@ pc_reset_hard_init(void)
 void
 pc_reset_hard(void)
 {
-	pc_reset_hard_close();
-
-	pc_reset_hard_init();
+	hard_reset_pending = 1;
 }
 
 
@@ -936,6 +935,13 @@ pc_run(void)
 {
 	wchar_t temp[200];
 
+	/* Trigger a hard reset if one is pending. */
+	if (hard_reset_pending) {
+		hard_reset_pending = 0;
+		pc_reset_hard_close();
+		pc_reset_hard_init();
+	}
+
 	/* Run a block of code. */
 	startblit();
 	cpu_exec(cpu_s->rspeed / 100);
diff --git a/src/chipset/via_pipc.c b/src/chipset/via_pipc.c
index 8202302e3..d488035ee 100644
--- a/src/chipset/via_pipc.c
+++ b/src/chipset/via_pipc.c
@@ -834,7 +834,7 @@ pipc_write(int func, int addr, uint8_t val, void *priv)
 	}
     } else if (func == pm_func) { /* Power */
 	/* Read-only addresses */
-	if ((addr < 0xd) || ((addr >= 0xe) && (addr < 0x40)) || (addr == 0x43) ||
+	if ((addr < 0xd) || ((addr >= 0xe) && (addr < 0x40)) || (addr == 0x43) || (addr == 0x4a) || (addr == 0x4b) ||
 	    (addr == 0x4e) || (addr == 0x4f) || (addr == 0x56) || (addr == 0x57) || ((addr >= 0x5c) && (addr < 0x61)) ||
 	    ((addr >= 0x64) && (addr < 0x70)) || (addr == 0x72) || (addr == 0x73) || ((addr >= 0x75) && (addr < 0x80)) ||
 	    (addr == 0x83) || ((addr >= 0x85) && (addr < 0x90)) || ((addr >= 0x92) && (addr < 0xd2)) || (addr >= 0xd7))
@@ -848,10 +848,20 @@ pipc_write(int func, int addr, uint8_t val, void *priv)
 
 	switch (addr) {
 		case 0x41: case 0x48: case 0x49:
+			if (addr == 0x48) {
+				if (dev->local >= VIA_PIPC_596A)
+					val = (val & 0x80) | 0x01;
+				else
+					val = 0x01;
+			}
+
 			dev->power_regs[addr] = val;
 			c = (dev->power_regs[0x49] << 8);
 			if (dev->local >= VIA_PIPC_596A)
 				c |= (dev->power_regs[0x48] & 0x80);
+			/* Workaround for P3V133 BIOS in 596B mode mapping ACPI to E800 (same as SMBus) instead of E400. */
+			if ((dev->local == VIA_PIPC_596B) && (c == ((dev->power_regs[0x91] << 8) | (dev->power_regs[0x90] & 0xf0))) && (dev->power_regs[0xd2] & 0x01))
+				c -= 0x400;
 			acpi_set_timer32(dev->acpi, dev->power_regs[0x41] & 0x08);
 			acpi_update_io_mapping(dev->acpi, c, dev->power_regs[0x41] & 0x80);
 			break;
diff --git a/src/include/86box/language.h b/src/include/86box/language.h
index b5e7a4304..006bc2312 100644
--- a/src/include/86box/language.h
+++ b/src/include/86box/language.h
@@ -115,6 +115,7 @@
 #define IDS_2139	2139		// "MO images (*.IM?)\0*.IM?..."
 #define IDS_2140	2140		// "CD-ROM images (*.ISO;*.CU.."
 #define IDS_2141	2141		// "%hs Device Configuration"
+#define IDS_2142	2142		// "Monitor in sleep mode"
 
 #define IDS_4096	4096		// "Hard disk (%s)"
 #define IDS_4097	4097		// "%01i:%01i"
@@ -222,7 +223,7 @@
 
 #define IDS_LANG_ENUS	IDS_7168
 
-#define STR_NUM_2048	94
+#define STR_NUM_2048	95
 #define STR_NUM_3072	11
 #define STR_NUM_4096	39
 #define STR_NUM_4352	6
diff --git a/src/include/86box/vid_svga.h b/src/include/86box/vid_svga.h
index ff1a7c985..018c824a5 100644
--- a/src/include/86box/vid_svga.h
+++ b/src/include/86box/vid_svga.h
@@ -135,6 +135,7 @@ typedef struct svga_t
 	    plane_mask, writemask,
 	    colourcompare, colournocare,
 	    dac_mask, dac_status,
+	    dpms, dpms_ui,
 	    ksc5601_sbyte_mask, ksc5601_udc_area_msb[2];
 
     int ksc5601_swap_mode;
diff --git a/src/video/vid_ati_mach64.c b/src/video/vid_ati_mach64.c
index ed554309b..0d816ba7f 100644
--- a/src/video/vid_ati_mach64.c
+++ b/src/video/vid_ati_mach64.c
@@ -2282,6 +2282,7 @@ void mach64_ext_writeb(uint32_t addr, uint8_t val, void *p)
                         svga->fb_only = 1;
                 else
                         svga->fb_only = 0;
+                svga->dpms = !!(mach64->crtc_gen_cntl & 0x0c);
                 svga_recalctimings(&mach64->svga);
                 break;
 
diff --git a/src/video/vid_cl54xx.c b/src/video/vid_cl54xx.c
index 1d42f4a2d..6a3331b1d 100644
--- a/src/video/vid_cl54xx.c
+++ b/src/video/vid_cl54xx.c
@@ -910,6 +910,13 @@ gd54xx_out(uint16_t addr, uint8_t val, void *p)
 					gd54xx_update_overlay(gd54xx);
 					break;
 
+				case 0x0e:
+					if (svga->crtc[0x27] >= CIRRUS_ID_CLGD5429) {
+						svga->dpms = (val & 0x06) && ((svga->miscout & ((val & 0x06) << 5)) != 0xc0);
+						svga_recalctimings(svga);
+					}
+					break;
+
 				case 0x10:
 					gd543x_mmio_write(0xb8001, val, gd54xx);
 					break;
diff --git a/src/video/vid_ddc.c b/src/video/vid_ddc.c
index d7daefb2e..6fc8276e4 100644
--- a/src/video/vid_ddc.c
+++ b/src/video/vid_ddc.c
@@ -148,7 +148,7 @@ ddc_init(void *i2c)
     edid->input_params = 0x0e; /* analog input; separate sync; composite sync; sync on green */
     edid->horiz_size = horiz_mm / 10;
     edid->vert_size = vert_mm / 10;
-    edid->features = 0x0b; /* RGB color; first timing is preferred; GTF/CVT */
+    edid->features = 0xeb; /* DPMS standby/suspend/active-off; RGB color; first timing is preferred; GTF/CVT */
 
     edid->red_green_lsb = 0x81;
     edid->blue_white_lsb = 0xf1;
diff --git a/src/video/vid_mga.c b/src/video/vid_mga.c
index 5a1d7a4b5..8ac16f2d6 100644
--- a/src/video/vid_mga.c
+++ b/src/video/vid_mga.c
@@ -691,6 +691,8 @@ mystique_out(uint16_t addr, uint8_t val, void *p)
 	case 0x3df:
 		if (mystique->crtcext_idx < 6)
 			mystique->crtcext_regs[mystique->crtcext_idx] = val;
+		if (mystique->crtcext_idx == 1)
+			svga->dpms = !!(val & 0x30);
 		if (mystique->crtcext_idx < 4) {
 			svga->fullchange = changeframecount;
 			svga_recalctimings(svga);
diff --git a/src/video/vid_s3.c b/src/video/vid_s3.c
index 33f4a217e..fae21a279 100644
--- a/src/video/vid_s3.c
+++ b/src/video/vid_s3.c
@@ -2172,6 +2172,16 @@ s3_out(uint16_t addr, uint8_t val, void *p)
 		} else if (svga->seqaddr == 0xa) {
 			svga->seqregs[svga->seqaddr] = val & 0x80;
 			return;
+		} else if (s3->chip >= S3_VISION964) {
+			if (svga->seqaddr == 0x08) {
+				svga->seqregs[svga->seqaddr] = val & 0x0f;
+				return;
+			} else if ((svga->seqaddr == 0x0d) && (svga->seqregs[0x08] == 0x06)) {
+				svga->seqregs[svga->seqaddr] = val;
+				svga->dpms = ((s3->chip >= S3_VISION964) && (svga->seqregs[0x0d] & 0x50)) || (svga->crtc[0x56] & ((s3->chip >= S3_TRIO32) ? 0x06 : 0x20));
+				svga_recalctimings(svga);
+				return;
+			}
 		}
 		break;
 		
@@ -2376,6 +2386,11 @@ s3_out(uint16_t addr, uint8_t val, void *p)
 			}
 			break;
 
+                        case 0x56:
+                        svga->dpms = ((s3->chip >= S3_VISION964) && (svga->seqregs[0x0d] & 0x50)) || (svga->crtc[0x56] & ((s3->chip >= S3_TRIO32) ? 0x06 : 0x20));
+                        old = ~val; /* force recalc */
+                        break;
+
 			case 0x67:
 			if (s3->chip >= S3_TRIO32) {
 				switch (val >> 4)
diff --git a/src/video/vid_s3_virge.c b/src/video/vid_s3_virge.c
index bf7b64029..4b37eda62 100644
--- a/src/video/vid_s3_virge.c
+++ b/src/video/vid_s3_virge.c
@@ -428,6 +428,14 @@ static void s3_virge_out(uint16_t addr, uint8_t val, void *p)
 				svga->write_bank = svga->read_bank = virge->bank << 16;
 			else
 				svga->write_bank = svga->read_bank = virge->bank << 14;
+		} else if (svga->seqaddr == 0x08) {
+			svga->seqregs[svga->seqaddr] = val & 0x0f;
+			return;
+		} else if ((svga->seqaddr == 0x0d) && (svga->seqregs[0x08] == 0x06)) {
+			svga->seqregs[svga->seqaddr] = val;
+			svga->dpms = (svga->seqregs[0x0d] & 0x50) || (svga->crtc[0x56] & 0x06);
+			svga_recalctimings(svga);
+			return;
 		}
 		break;
                 
@@ -543,6 +551,11 @@ static void s3_virge_out(uint16_t addr, uint8_t val, void *p)
                         case 0x58: case 0x59: case 0x5a:
                         s3_virge_updatemapping(virge);
                         break;
+
+                        case 0x56:
+                        svga->dpms = (svga->seqregs[0x0d] & 0x50) || (svga->crtc[0x56] & 0x06);
+                        old = ~val; /* force recalc */
+                        break;
                         
                         case 0x67:
                         switch (val >> 4)
diff --git a/src/video/vid_svga.c b/src/video/vid_svga.c
index f641d0bb2..de84df1f0 100644
--- a/src/video/vid_svga.c
+++ b/src/video/vid_svga.c
@@ -34,6 +34,8 @@
 #include <86box/pit.h>
 #include <86box/mem.h>
 #include <86box/rom.h>
+#include <86box/plat.h>
+#include <86box/ui.h>
 #include <86box/video.h>
 #include <86box/vid_svga.h>
 #include <86box/vid_svga_render.h>
@@ -574,12 +576,29 @@ svga_recalctimings(svga_t *svga)
 	svga->dispontime = TIMER_USEC;
     if (svga->dispofftime < TIMER_USEC)
 	svga->dispofftime = TIMER_USEC;
+
+    /* Inform the user interface of any DPMS mode changes. */
+    if (svga->dpms) {
+	if (!svga->dpms_ui) {
+		svga->dpms_ui = 1;
+		ui_sb_set_text_w(plat_get_string(IDS_2142));
+	}
+    } else if (svga->dpms_ui) {
+	svga->dpms_ui = 0;
+	ui_sb_set_text_w(NULL);
+    }
 }
 
 
 static void
 svga_do_render(svga_t *svga)
 {
+    /* Always render a blank screen and nothing else while in DPMS mode. */
+    if (svga->dpms) {
+	svga_render_blank(svga);
+	return;
+    }
+
     if (!svga->override) {
 	svga->render(svga);
 
@@ -963,6 +982,9 @@ svga_close(svga_t *svga)
     free(svga->changedvram);
     free(svga->vram);
 
+    if (svga->dpms_ui)
+	ui_sb_set_text_w(NULL);
+
     svga_pri = NULL;
 }
 
@@ -1361,7 +1383,10 @@ svga_doblit(int y1, int y2, int wx, int wy, svga_t *svga)
 	} else
 		suppress_overscan = 0;
 
-	set_screen_size(xsize + x_add, ysize + y_add);
+	/* Block resolution changes while in DPMS mode to avoid getting a bogus
+	   screen width (320). We're already rendering a blank screen anyway. */
+	if (!svga->dpms)
+		set_screen_size(xsize + x_add, ysize + y_add);
 
 	if (video_force_resize_get())
 		video_force_resize_set(0);
diff --git a/src/video/vid_voodoo_banshee.c b/src/video/vid_voodoo_banshee.c
index 5d5e1c892..7083c10ee 100644
--- a/src/video/vid_voodoo_banshee.c
+++ b/src/video/vid_voodoo_banshee.c
@@ -678,6 +678,8 @@ static void banshee_ext_outl(uint16_t addr, uint32_t val, void *p)
 
                 case DAC_dacMode:
                 banshee->dacMode = val;
+               	svga->dpms = !!(val & 0x0a);
+               	svga_recalctimings(svga);
                 break;
                 case DAC_dacAddr:
                 banshee->dacAddr = val & 0x1ff;
diff --git a/src/win/86Box.rc b/src/win/86Box.rc
index da174a4fa..c9dd1e072 100644
--- a/src/win/86Box.rc
+++ b/src/win/86Box.rc
@@ -1076,6 +1076,7 @@ BEGIN
     IDS_2139	"MO images (*.IM?;*.MDI)\0*.IM?;*.MDI\0All files (*.*)\0*.*\0"
     IDS_2140	"CD-ROM images (*.ISO;*.CUE)\0*.ISO;*.CUE\0All files (*.*)\0*.*\0"
     IDS_2141	"%hs Device Configuration"
+    IDS_2142    "Monitor in sleep mode"
 END
 
 STRINGTABLE DISCARDABLE 
diff --git a/src/win/win_stbar.c b/src/win/win_stbar.c
index e2a768570..ea7be0212 100644
--- a/src/win/win_stbar.c
+++ b/src/win/win_stbar.c
@@ -72,6 +72,8 @@ static int	sb_ready = 0;
 static uint8_t	sb_map[256];
 static int  dpi = 96;
 static int  icon_width = 24;
+static wchar_t	sb_text[512] = L"\0";
+static wchar_t	sb_bugtext[512] = L"\0";
 
 /* Also used by win_settings.c */
 intptr_t
@@ -424,6 +426,11 @@ StatusBarDestroyTips(void)
 void
 ui_sb_set_ready(int ready)
 {
+    if (ready == 0) {
+	ui_sb_bugui(NULL);
+	ui_sb_set_text(NULL);
+    }
+
     sb_ready = ready;
 }
 
@@ -941,9 +948,8 @@ StatusBarCreate(HWND hwndParent, uintptr_t idStatus, HINSTANCE hInst)
 }
 
 
-/* API */
-void
-ui_sb_set_text_w(wchar_t *wstr)
+static void
+ui_sb_update_text()
 {
     uint8_t part = 0xff;
 
@@ -953,7 +959,19 @@ ui_sb_set_text_w(wchar_t *wstr)
     part = sb_map[SB_TEXT];
 
     if (part != 0xff)
-	SendMessage(hwndSBAR, SB_SETTEXT, part | SBT_NOBORDERS, (LPARAM)wstr);
+	SendMessage(hwndSBAR, SB_SETTEXT, part | SBT_NOBORDERS, (LPARAM)((sb_text[0] != L'\0') ? sb_text : sb_bugtext));
+}
+
+
+/* API */
+void
+ui_sb_set_text_w(wchar_t *wstr)
+{
+    if (wstr)
+	wcscpy(sb_text, wstr);
+    else
+	memset(sb_text, 0x00, sizeof(sb_text));
+    ui_sb_update_text();
 }
 
 
@@ -961,11 +979,11 @@ ui_sb_set_text_w(wchar_t *wstr)
 void
 ui_sb_set_text(char *str)
 {
-    static wchar_t wstr[512];
-
-    memset(wstr, 0x00, sizeof(wstr));
-    mbstowcs(wstr, str, strlen(str) + 1);
-    ui_sb_set_text_w(wstr);
+    if (str)
+	mbstowcs(sb_text, str, strlen(str) + 1);
+    else
+	memset(sb_text, 0x00, sizeof(sb_text));
+    ui_sb_update_text();
 }
 
 
@@ -973,9 +991,9 @@ ui_sb_set_text(char *str)
 void
 ui_sb_bugui(char *str)
 {
-    static wchar_t wstr[512];
-
-    memset(wstr, 0x00, sizeof(wstr));
-    mbstowcs(wstr, str, strlen(str) + 1);
-    ui_sb_set_text_w(wstr);
+    if (str)
+	mbstowcs(sb_bugtext, str, strlen(str) + 1);
+    else
+	memset(sb_bugtext, 0x00, sizeof(sb_bugtext));
+    ui_sb_update_text();
 }