HackingVGAforFun: Unterschied zwischen den Versionen

Aktuelle Version vom 8. April 2017, 21:55 Uhr

HackingVGAforFun Release status: obsolete [box doku]

Description	How to fool around with the VGA Controller

HackingVGAforFun[Bearbeiten | Quelltext bearbeiten]

This site describes how to fool around with the VGA Controller.

pinouts[Bearbeiten | Quelltext bearbeiten]

VGA pinouts

build a fake monitor[Bearbeiten | Quelltext bearbeiten]

Terminate the color lines with 75ohms
Attach a 24C02 serial eeprom to the specified pins (24c04 - 24c16 is possible to )
if no eeprom is at hand, connect ID3 to GND

Modesetting[Bearbeiten | Quelltext bearbeiten]

To set a custom mode either use xrandr or xorg.conf or selfbuild eeprom VGA adapter.

xrandr[Bearbeiten | Quelltext bearbeiten]

To do so use xrandr:

xrandr --newmode "MODE1"   64.00  1400 1400 1401 1401 700 700 702 702 -hsync -vsync
xrandr --addmode VGA-0 "MODE1"
xrandr --output VGA-0 --mode "MODE1" --right-of LVDS

note: VGA-0 may not apply, it could be VGA1 or VGA too, depending on the driver.
note: the last command assumes LVDS to be your primary active connector, change depending on your system.

alternative arandr

Xorg.conf[Bearbeiten | Quelltext bearbeiten]

Add a ModeLine to your Xorg.conf.

Section "Monitor"
       Identifier      "SyncMaster"
       Option          "VGA-0"
       HorizSync       30-96
       VertRefresh     50-160
       ModeLine        "MODE1" 64.00  1400 1400 1401 1401 700 700 702 702
EndSection

monitor edid[Bearbeiten | Quelltext bearbeiten]

Add a 24C02 EEPROM to a VGA connector. This EEPROM contains the EDID.

I used EDID 1.3
Windows Xp

accepts
- standart timings
- established timings
regrets
- prefered timings

Windows Vista and newer

accepts
- standart timings
- established timings
regrets
- TODO

Linux

The kernel module drm handels all the display stuff
it accepts:
- established timings
- standart timings
- prefered timings

hack the kernel module drm for custom edid[Bearbeiten | Quelltext bearbeiten]

This is only neccesarry for custom EDIDs inside the "monitors" EEPROM. Using either the Xorg.conf method or the xrandr method doesn't need modification to the drm kernel module. It is only neccessary if you specify hsync < 1 or vsync < 1 in your EDID.

on debian
- install linux-source
- install linux-kernel-headers
- append to the drm Makefile and run make

all:
	$(MAKE) -C $(KDIR) M=$(PWD) modules
	cp *.ko /lib/modules/`uname -r`/kernel/drivers/gpu/drm
	cp nouveau/*.ko /lib/modules/`uname -r`/kernel/drivers/gpu/drm/nouveau
	cp radeon/*.ko /lib/modules/`uname -r`/kernel/drivers/gpu/drm/radeon
	cp via/*.ko /lib/modules/`uname -r`/kernel/drivers/gpu/drm/via
	cp gma500/*.ko /lib/modules/`uname -r`/kernel/drivers/gpu/drm/gma500
	cp i915/*.ko /lib/modules/`uname -r`/kernel/drivers/gpu/drm/i915
	chmod 755 /lib/modules/`uname -r`/kernel/drivers/gpu/drm
	update-initramfs -u

on fedora
- install kernel-sources
- append to the drm Makefile and run make

KDIR    := /lib/modules/$(shell uname -r)/build
all:
	$(MAKE) -C $(KDIR) M=$(PWD) modules
	cp *.ko /lib/modules/`uname -r`/kernel/drivers/gpu/drm
	cp nouveau/*.ko /lib/modules/`uname -r`/kernel/drivers/gpu/drm/nouveau
	cp radeon/*.ko /lib/modules/`uname -r`/kernel/drivers/gpu/drm/radeon
	cp via/*.ko /lib/modules/`uname -r`/kernel/drivers/gpu/drm/via
	cp gma500/*.ko /lib/modules/`uname -r`/kernel/drivers/gpu/drm/gma500
	cp i915/*.ko /lib/modules/`uname -r`/kernel/drivers/gpu/drm/i915
	chmod 755 /lib/modules/`uname -r`/kernel/drivers/gpu/drm
	dracut -f /boot/initramfs-currentimage

patch drm_edid.c , it doesn't accept vsync_width OR hsync_width to be 0

how to flash a new edid into monitor eeprom[Bearbeiten | Quelltext bearbeiten]

remove fglrx or fglrx-legacy, make sure mesa is running !
Load the kernelmodule i2c-dev
Get i2c-tools
build the i2c-tools
Become root: Sudo -s
Add the tools folder to the PATH: PATH=$PATH:< ... >/i2c-tools/tools
Run i2cdump to find the correct BUSID (device at 0x50 and 0x51)
Flash new EDID with write-edid.sh
Note the input file is plain/text with hexvalues, spaces and newlines only

how to build custom edid[Bearbeiten | Quelltext bearbeiten]

download edid from monitor
- Linux: use i2c-get
- Windows: Registry or Phoenix EDID Designer
use Phoenix EDID Designer to create custom EDIDs
- Note: it runs under WINE

Note

the tool outputs .dat-files, that need to be editet by hand, it contains invalid symbols
you can use the export function to generate .raw files and use hexdump to convert them to plain/text hex

Tests[Bearbeiten | Quelltext bearbeiten]

Test system[Bearbeiten | Quelltext bearbeiten]

Linux 3.11.6 x86_64
Mesa 9.2.0
Intel(R) Core(TM)2 Quad CPU Q9300 @ 2.50GHz
4GByte DDR2 Memory

tips & tricks[Bearbeiten | Quelltext bearbeiten]

activate vsync

mesa
- $ swapbufferswait=1 vblank_mode=3 <command>
nvidia
- __GL_SYNC_TO_VBLANK=1 <command>

on xfce glutfullscreen might be broken, kill your X and run

swapbufferswait=1 vblank_mode=3 xinit ./vgatoiqbaseband -t -v -n :0

Results[Bearbeiten | Quelltext bearbeiten]

bandwidth is measured with vsync off using GL_ARB_pixel_buffer_object. This extensions allows asynchronous CPU MEM -> GPU MEM DMA transfers.

Vendor	Name	Codename	Driver	VRAM [MB]	max bandwidth [MB/s]	min vsync	min hsync	min vblank	min hblank	Optional
Nvidia	Geforce 8600GTS	NV84	Mesa 9.2.0	256	310	1*	1*	1*	1*	hsync + hblank > 1, vsync + vblank > 1, every second frame is blank if (vsync + vblank) = 1 or (hsync + hblank) = 1
ATI	Radeon HD4850	RV770	Mesa 9.2.0	512	390	2	1*	0	1*	hsync + hblank > 0
ATI	Radeon HD4350 mobility	RV710	fglrx 8.92	512	-	2	1*	0	1*
Intel(R)	Ivybridge Desktop	GT1	Mesa 9.2.0	2048 ?	1400	0*	0*	4*	12*	hsync + hblank >= 12, vsync + vblank >= 4, frontporch > 0, backporch > 0
ATI	Radeon HD6870	Barts	Mesa 9.2.0	1024	530	2	1*	0	1*	hsync + hblank > 0, either of one can be zero
Nvidia	Geforce 8600GTS	NV84	Nvidia 331.20	256	1050	1	0	2	2	vfrontporch > 0, vbackporch > 0, display connector changes to "disconnected" on "wrong" modelines appended, resulting in unusable xrandr
Nvidia	Geforce 8400GT	NV50	Mesa 9.2.0	256	400	1*	0*	1*	1*	hsync + hblank > 0, vsync + vblank > 1, every second frame is blank if (hsync + hblank) = 1
Ati	X1650	RV5xx	Mesa 9.2.0	256	470	0*	1*	1*	1*	hsync + hblank > 0, vsync + vblank > 1
Nvidia	Quadro NVS 280	NV34	Mesa 9.2.0	64	-	0	1	1	8	sponsored by Jonke, OpenGL 1.5, only Power-of-Two Textures, vgatobaseband doesnt work
Intel	Q45/Q43	4 Series Chipset Integrated Graphics Controller	Mesa 9.2.0	2048	-	0	0	1	1
Intel	Q35	82Q35 Express Integrated Graphics Controller	Mesa 9.2.0	512	-	0	0	1	1

Recommended Modelines[Bearbeiten | Quelltext bearbeiten]

Nvidia NV84 56.00 1024 1025 1025 1026 768 766 767 769
Nvidia NV50 56.00 1024 1024 1024 1025 768 769 770 771
Intel GT1 56.00 1400 1412 1412 1412 700 701 701 704
Intel Q35 56.00 1023 1024 1024 1024 1023 1024 1024 1024

Links[Bearbeiten | Quelltext bearbeiten]

http://www.nathandumont.com/node/241

@@ Zeile 1: / Zeile 1: @@
-== VGA ==
+{{ProjektInfoBox
-Video Graphics Adapter
+|name=HackingVGAforFun
+|status=obsolete
+|image=VGA.jpg
+|description=How to fool around with the VGA Controller
+|tags=Fun, VGA, Controller,
+}}
+== HackingVGAforFun ==
+This site describes how to fool around with the VGA Controller.
 == pinouts ==
 [http://pinouts.ru/all/VGA15_pinout.shtml VGA pinouts]
-== edid ==
+== build a fake monitor ==
-[http://de.wikipedia.org/wiki/EDID EDID]
+* Terminate the color lines with 75ohms
+* Attach a 24C02 serial eeprom to the specified pins (24c04 - 24c16 is possible to )
+* if no eeprom is at hand, connect ID3 to GND
+== Modesetting ==
+To set a custom mode either use ''xrandr'' or ''xorg.conf'' or ''selfbuild eeprom VGA adapter''.
+=== xrandr ===
+To do so use xrandr:<br>
+ xrandr --newmode "MODE1"   64.00  1400 1400 1401 1401 700 700 702 702 -hsync -vsync
+ xrandr --addmode VGA-0 "MODE1"
+ xrandr --output VGA-0 --mode "MODE1" --right-of LVDS
+note: VGA-0 may not apply, it could be VGA1 or VGA too, depending on the driver.<br>
+note: the last command assumes LVDS to be your primary active connector, change depending on your system.
+alternative arandr
+=== Xorg.conf ===
+Add a ModeLine to your Xorg.conf.
+ Section "Monitor"
+        Identifier      "SyncMaster"
+        Option          "VGA-0"
+        HorizSync       30-96
+        VertRefresh     50-160
+        ModeLine        "MODE1" 64.00  1400 1400 1401 1401 700 700 702 702
+ EndSection
+=== monitor edid ===
+Add a 24C02 EEPROM to a VGA connector. This EEPROM contains the [http://de.wikipedia.org/wiki/EDID EDID].
 I used EDID 1.3<br>
-'''Windows'''
+'''Windows Xp'''
-* it accepts:
+* ''accepts''
+** standart timings
+** established timings
+*''regrets''
+** prefered timings
+'''Windows Vista and newer'''
+* ''accepts''
 ** standart timings
 ** established timings
-* it looks like Windows XP doesn't like "prefered timings"
+*''regrets''
+** TODO
 '''Linux'''
@@ Zeile 21: / Zeile 66: @@
 ** prefered timings
-== build a fake monitor ==
+=== hack the kernel module drm for custom edid ===
-* Terminate the color lines with 75ohms
+This is only neccesarry for custom EDIDs inside the "monitors" EEPROM. Using either the ''Xorg.conf'' method or the ''xrandr'' method doesn't need modification to the drm kernel module. It is only neccessary if you specify hsync < 1 or vsync < 1 in your EDID.
-* Attach a 24C02 serial eeprom to the specified pins (24c04 - 24c16 is possible to )
+* on debian
+** install linux-source
+** install linux-kernel-headers
+** append to the drm Makefile and run make
+ all:
+ 	$(MAKE) -C $(KDIR) M=$(PWD) modules
+ 	cp *.ko /lib/modules/`uname -r`/kernel/drivers/gpu/drm
+ 	cp nouveau/*.ko /lib/modules/`uname -r`/kernel/drivers/gpu/drm/nouveau
+ 	cp radeon/*.ko /lib/modules/`uname -r`/kernel/drivers/gpu/drm/radeon
+ 	cp via/*.ko /lib/modules/`uname -r`/kernel/drivers/gpu/drm/via
+ 	cp gma500/*.ko /lib/modules/`uname -r`/kernel/drivers/gpu/drm/gma500
+ 	cp i915/*.ko /lib/modules/`uname -r`/kernel/drivers/gpu/drm/i915
+ 	chmod 755 /lib/modules/`uname -r`/kernel/drivers/gpu/drm
+ 	update-initramfs -u
+* on fedora
+** install kernel-sources
+** append to the drm Makefile and run make
+ KDIR    := /lib/modules/$(shell uname -r)/build
+ all:
+ 	$(MAKE) -C $(KDIR) M=$(PWD) modules
+ 	cp *.ko /lib/modules/`uname -r`/kernel/drivers/gpu/drm
+ 	cp nouveau/*.ko /lib/modules/`uname -r`/kernel/drivers/gpu/drm/nouveau
+ 	cp radeon/*.ko /lib/modules/`uname -r`/kernel/drivers/gpu/drm/radeon
+ 	cp via/*.ko /lib/modules/`uname -r`/kernel/drivers/gpu/drm/via
+ 	cp gma500/*.ko /lib/modules/`uname -r`/kernel/drivers/gpu/drm/gma500
+ 	cp i915/*.ko /lib/modules/`uname -r`/kernel/drivers/gpu/drm/i915
+ 	chmod 755 /lib/modules/`uname -r`/kernel/drivers/gpu/drm
+ 	dracut -f /boot/initramfs-currentimage
+* patch ''drm_edid.c'' , it doesn't accept vsync_width OR hsync_width to be 0
+== how to flash a new edid into monitor eeprom ==
-== flash a new edid ==
+* remove fglrx or fglrx-legacy, make sure mesa is running !
 * Load the kernelmodule i2c-dev
 * Get [http://www.lm-sensors.org/wiki/I2CTools i2c-tools]
@@ Zeile 35: / Zeile 113: @@
 * Note the input file is plain/text with hexvalues, spaces and newlines only
-== create custom edid ==
+== how to build custom edid ==
+* download edid from monitor
+** Linux: use i2c-get
+** Windows: Registry or [http://www.tucows.com/preview/329441 Phoenix EDID Designer]
 * use [http://www.tucows.com/preview/329441 Phoenix EDID Designer] to create custom EDIDs
+** Note: it runs under WINE
 '''Note'''
 * the tool outputs .dat-files, that need to be editet by hand, it contains invalid symbols
 * you can use the export function to generate .raw files and use hexdump to convert them to plain/text hex
-== custom edid ==
-* it looks like ATI Radeon HD5xxx only accepts: >= 2 vsync and >= 1 hsync
-** with modified drm it is possible to use hsync == 0 too
-=== hack the kernel module drm ===
+== Tests ==
-* install linux-source
+=== Test system ===
-* install linux-kernel-headers
+* Linux 3.11.6 x86_64
-* modify the Makefile
+* Mesa 9.2.0
-  all:
+* Intel(R) Core(TM)2 Quad  CPU   Q9300  @ 2.50GHz
- 	$(MAKE) -C $(KDIR) M=$(PWD) modules
+* 4GByte DDR2 Memory
- 	cp drm.ko /lib/modules/`uname -r`/kernel/drivers/gpu/drm
- 	cp drm_kms_helper.ko /lib/modules/`uname -r`/kernel/drivers/gpu/drm
+=== tips & tricks ===
- 	chmod 755 /lib/modules/`uname -r`/kernel/drivers/gpu/drm
+'''activate vsync'''
- 	update-initramfs -u
+* mesa
+** $ swapbufferswait=1 vblank_mode=3 <command>
+* nvidia
+** __GL_SYNC_TO_VBLANK=1 <command>
+'''on xfce glutfullscreen might be broken, kill your X and run'''
+ swapbufferswait=1 vblank_mode=3 xinit ./vgatoiqbaseband -t -v -n :0
+=== Results ===
+* bandwidth is measured with vsync off using GL_ARB_pixel_buffer_object. This extensions allows asynchronous CPU MEM -> GPU MEM DMA transfers.
+{| {{Prettytable}}
+! Vendor !! Name !! Codename !! Driver !! VRAM [MB]!! max bandwidth [MB/s]!! min vsync !! min hsync !! min vblank !! min hblank !! Optional
+|-
+| Nvidia
+| Geforce 8600GTS
+| NV84
+| Mesa 9.2.0
+| 256
+| 310
+| 1*
+| 1*
+| 1*
+| 1*
+| hsync + hblank > 1, vsync + vblank > 1, every second frame is blank if  (vsync + vblank) = 1 or (hsync + hblank) = 1
+|-
+| ATI
+| Radeon HD4850
+| RV770
+| Mesa 9.2.0
+| 512
+| 390
+| 2
+| 1*
+| 0
+| 1*
+| hsync + hblank > 0
+|-
+| ATI
+| Radeon HD4350 mobility
+| RV710
+| fglrx 8.92
+| 512
+| -
+| 2
+| 1*
+| 0
+| 1*
+|
+|-
+| Intel(R)
+| Ivybridge Desktop
+| GT1
+| Mesa 9.2.0
+| 2048 ?
+| 1400
+| 0*
+| 0*
+| 4*
+| 12*
+| hsync + hblank >= 12, vsync + vblank >= 4, frontporch > 0, backporch > 0
+|-
+| ATI
+| Radeon HD6870
+| Barts
+| Mesa 9.2.0
+| 1024
+| 530
+| 2
+| 1*
+| 0
+| 1*
+| hsync + hblank > 0, either of one can be zero
+|-
+| Nvidia
+| Geforce 8600GTS
+| NV84
+| Nvidia 331.20
+| 256
+| 1050
+| 1
+| 0
+| 2
+| 2
+| vfrontporch > 0, vbackporch > 0, display connector changes to "disconnected" on "wrong" modelines appended, resulting in unusable xrandr
+|-
+| Nvidia
+| Geforce 8400GT
+| NV50
+| Mesa 9.2.0
+| 256
+| 400
+| 1*
+| 0*
+| 1*
+| 1*
+| hsync + hblank > 0, vsync + vblank > 1, every second frame is blank if (hsync + hblank) = 1
+|-
+| Ati
+| X1650
+| RV5xx
+| Mesa 9.2.0
+| 256
+| 470
+| 0*
+| 1*
+| 1*
+| 1*
+| hsync + hblank > 0, vsync + vblank > 1
+|-
+| Nvidia
+| Quadro NVS 280
+| NV34
+| Mesa 9.2.0
+| 64
+| -
+| 0
+| 1
+| 1
+| 8
+| '''sponsored by Jonke''', OpenGL 1.5, only Power-of-Two Textures, ''vgatobaseband doesnt work''
+|-
+| Intel
+| Q45/Q43
+| 4 Series Chipset Integrated Graphics Controller
+| Mesa 9.2.0
+| 2048
+| -
+| 0
+| 0
+| 1
+| 1
+|
+|-
+| Intel
+| Q35
+| 82Q35 Express Integrated Graphics Controller
+| Mesa 9.2.0
+| 512
+| -
+| 0
+| 0
+| 1
+| 1
+|
+|-
+|}
-* patch ''drm_edid.c'' , it doesn't accept vsync_width OR hsync_width to be 0
+== Recommended Modelines ==
+* Nvidia NV84 56.00 1024 1025 1025 1026 768 766 767 769
+* Nvidia NV50 56.00 1024 1024 1024 1025 768 769 770 771
+* Intel GT1 56.00  1400 1412 1412 1412 700 701 701 704
+* Intel Q35 56.00 1023 1024 1024 1024 1023 1024 1024 1024
+== Links ==
+* http://www.nathandumont.com/node/241
-* total lines has to be greater than active lines
+[[Category:HowTo]]