Specific resolution without monitor

Specific resolution without monitor

[Carl Hunter]

I'm trying to set my xorg.conf file up so that I get a specific 
resolution when my monitor is turned off and I reboot my PC.  lspci 
shows that I've got a 945GME and Xorg.0.log shows that I'm using version 
2.17.0 of the Intel driver.  I'm running Mythbuntu 11.10.  With my other 
systems running the nvidia driver I can use the option 
"ConnectedMonitor" to achieve this.  I guess I'm looking for the 
equivalent for the Intel driver.

Thanks

Carl

Re: Specific resolution without monitor

[Oliver Seitz]

Am 16.05.2012 21:48, schrieb Carl Hunter:
> I'm trying to set my xorg.conf file up so that I get a specific
> resolution when my monitor is turned off and I reboot my PC. lspci shows
> that I've got a 945GME and Xorg.0.log shows that I'm using version
> 2.17.0 of the Intel driver. I'm running Mythbuntu 11.10. With my other
> systems running the nvidia driver I can use the option
> "ConnectedMonitor" to achieve this. I guess I'm looking for the
> equivalent for the Intel driver.

There is no equivalent. The driver relies on DDC or EDID data, and 
there's no way to override that on startup.

But, if a monitor is connected but turned off, the monitor should be 
configured anyway. The EDID transmitting device inside the monitor is 
powered by the computer.

As soon as X has started and the output is activated, xrandr can be used 
to set a specific resolution. It can not, however, activate an output on 
which no monitor is connected.

Greets,
Kiste

Re: Specific resolution without monitor

[The Fungi]

On 2012-05-17 07:22:38 +0200 (+0200), Oliver Seitz wrote:
[...]
> But, if a monitor is connected but turned off, the monitor should
> be configured anyway. The EDID transmitting device inside the
> monitor is powered by the computer.
[...]

This is unfortunately not always the case. For example, one of my
computers is used as an HTPC and its monitor is an early generation
Sony HDTV connected via HDMI. It *does* respond to EDID requests,
but only when powered on and switched to that specific input.
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Re: Specific resolution without monitor

[Carl Hunter]

On 5/17/2012 7:56 AM, The Fungi wrote:
> On 2012-05-17 07:22:38 +0200 (+0200), Oliver Seitz wrote:
> [...]
>> But, if a monitor is connected but turned off, the monitor should
>> be configured anyway. The EDID transmitting device inside the
>> monitor is powered by the computer.
> [...]
>
> This is unfortunately not always the case. For example, one of my
> computers is used as an HTPC and its monitor is an early generation
> Sony HDTV connected via HDMI. It *does* respond to EDID requests,
> but only when powered on and switched to that specific input.
This is my problem too.  So basically there's no solution to this with 
the Intel driver?

Re: Specific resolution without monitor

[Oliver Seitz]

Am 17.05.2012 15:36, schrieb Carl Hunter:
> On 5/17/2012 7:56 AM, The Fungi wrote:
>> On 2012-05-17 07:22:38 +0200 (+0200), Oliver Seitz wrote:
>> [...]
>>> But, if a monitor is connected but turned off, the monitor should
>>> be configured anyway. The EDID transmitting device inside the
>>> monitor is powered by the computer.
>> [...]
>>
>> This is unfortunately not always the case. For example, one of my
>> computers is used as an HTPC and its monitor is an early generation
>> Sony HDTV connected via HDMI. It *does* respond to EDID requests,
>> but only when powered on and switched to that specific input.
> This is my problem too. So basically there's no solution to this with
> the Intel driver?

For what I know, the solution is to modify/add/replace hardware.

There have been options to forcefully enable outputs and set 
resolutions, but they have been revoked in fear of people using them 
without sufficient knowledge.

Greets,
Kiste

Re: Specific resolution without monitor

[Carl Hunter]

On 5/17/2012 9:44 AM, Oliver Seitz wrote:
> Am 17.05.2012 15:36, schrieb Carl Hunter:
>> On 5/17/2012 7:56 AM, The Fungi wrote:
>>> On 2012-05-17 07:22:38 +0200 (+0200), Oliver Seitz wrote:
>>> [...]
>>>> But, if a monitor is connected but turned off, the monitor should
>>>> be configured anyway. The EDID transmitting device inside the
>>>> monitor is powered by the computer.
>>> [...]
>>>
>>> This is unfortunately not always the case. For example, one of my
>>> computers is used as an HTPC and its monitor is an early generation
>>> Sony HDTV connected via HDMI. It *does* respond to EDID requests,
>>> but only when powered on and switched to that specific input.
>> This is my problem too. So basically there's no solution to this with
>> the Intel driver?
>
> For what I know, the solution is to modify/add/replace hardware.
>
> There have been options to forcefully enable outputs and set 
> resolutions, but they have been revoked in fear of people using them 
> without sufficient knowledge.
>
> Greets,
> Kiste
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx
I'm using an ASUS Eeebox B202 so I don't have the option of adding a 
different video card.  I'm not quite sure what you mean by modifying 
hardware but replacing the B202 defeats the purpose of trying to use it 
in the first place.  Are you suggesting I avoid Intel graphics cards for 
this type of setup?

Re: Specific resolution without monitor

[Oliver Seitz]

> I'm using an ASUS Eeebox B202 so I don't have the option of adding a
> different video card. I'm not quite sure what you mean by modifying
> hardware but replacing the B202 defeats the purpose of trying to use it
> in the first place. Are you suggesting I avoid Intel graphics cards for
> this type of setup?

My preference would be, that the force-parameters would be enabled 
again. But I have little hope for that.

By modifying hardware I meant to change the circuitry inside the 
monitor, so that EDID data is transmitted, even when the monitor is 
switched off.

By adding hardware I thought of a device to plug between the computer 
and the monitor which injects "fake" EDID data. Those devices, however, 
do cost about as much as a cheap monitor.

By replacing hardware, I meant to use a (modern) monitor which transmits 
EDID, even without power connected.

Greets,
Kiste

Re: Specific resolution without monitor

[paulo louro]

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Hey Carl,
I had the same problem as you.
So i wanted my MediaCenter to start up at for example 15h just before i get home. But since my TV and my AV receiver where in standby the resolution detected by the drm driver as always wrong. So to by pass this i have changed a bit intel drm driver and hard coded my TV EDID data directly into the driver. This ways every time the MC starts up it thinks is connected to the PC and setups the right resolution. 
Now this is not a simple thing to do since you will need to compile the linux kernel, you can also only compile the drm driver/module for sure but i dont know how to do that ....
So what i did was, with some linux software, named edid grab or read or something, i extracted my TV edid in HEX format. Then i changed the function "drm_do_get_edid" inside the drm_edid.c file located at the linux kernel/drivers/gpu/drm/  to ignore the i2c bus and to use the edid i defined inside my block1 byte array. Also needed to comment out some code, since EDID something comes in multiple messages. Below you can find my modifications.

I hope this help you out. Maybe this is not the right way of doing it, but it worked for me. I´m not and expert on DRM or I915 driver, just wanted to make it worked so i hard coded it all. You can always improve and maybe add the function of reading the EDID from a file like the NVIDIA driver has. 


static u8 *drm_do_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter){	int i, j = 0, valid_extensions = 0;	u8 *block, *new;	u8 block1[256] = {0x00,0xff,0xff,0xff,0xff,0xff,0xff,0x00,0x34,0xa9,0xa4,0xa0,0x01,0x01,0x01,0x01,		       0x00,0x14,0x01,0x03,0x80,0x00,0x00,0x78,0x0a,0xda,0xff,0xa3,0x58,0x4a,0xa2,0x29,		       0x17,0x49,0x4b,0x00,0x00,0x00,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01,		       0x01,0x01,0x01,0x01,0x01,0x01,0x02,0x3a,0x80,0xd0,0x72,0x38,0x2d,0x40,0x10,0x2c,		       0x45,0x80,0xba,0x88,0x21,0x00,0x00,0x1e,0x02,0x3a,0x80,0x18,0x71,0x38,0x2d,0x40,		       0x58,0x2c,0x45,0x00,0xba,0x88,0x21,0x00,0x00,0x1e,0x00,0x00,0x00,0xfc,0x00,0x50,		       0x61,0x6e,0x61,0x73,0x6f,0x6e,0x69,0x63,0x2d,0x54,0x56,0x0a,0x00,0x00,0x00,0xfd,		       0x00,0x17,0x3d,0x0f,0x44,0x0f,0x00,0x0a,0x20,0x20,0x20,0x20,0x20,0x20,0x01,0xd3,		       0x02,0x03,0x36,0x72,0x50,0x9f,0x90,0x14,0x05,0x20,0x13,0x04,0x12,0x03,0x11,0x02,		       0x16,0x07,0x15,0x06,0x01,0x23,0x09,0x07,0x01,0x78,0x03,0x0c,0x00,0x10,0x00,0xb8,		       0x26,0x2f,0xc0,0x0a,0x81,0x49,0xff,0xfc,0x06,0x16,0x08,0x00,0x18,0x00,0x00,0x00,		       0x00,0x00,0xe3,0x05,0x1f,0x01,0x01,0x1d,0x80,0xd0,0x72,0x1c,0x16,0x20,0x10,0x2c,		       0x25,0x80,0xba,0x88,0x21,0x00,0x00,0x9e,0x01,0x1d,0x80,0x18,0x71,0x1c,0x16,0x20,		       0x58,0x2c,0x25,0x00,0xba,0x88,0x21,0x00,0x00,0x9e,0x01,0x1d,0x00,0xbc,0x52,0xd0,		       0x1e,0x20,0xb8,0x28,0x55,0x40,0xba,0x88,0x21,0x00,0x00,0x1e,0x01,0x1d,0x00,0x72,		       0x51,0xd0,0x1e,0x20,0x6e,0x28,0x55,0x00,0xba,0x88,0x21,0x00,0x00,0x1e,0x00,0xb6};
	//if ((block = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL)	//	return NULL;
	if ((block = kmalloc(EDID_LENGTH*2, GFP_KERNEL)) == NULL)		return NULL;
		/* base block fetch */	//for (i = 0; i < 4; i++) {	//	if (drm_do_probe_ddc_edid(adapter, block, 0, EDID_LENGTH))	//		goto out;	//	if (drm_edid_block_valid(block))	//		break;	//	if (i == 0 && drm_edid_is_zero(block, EDID_LENGTH)) {	//		connector->null_edid_counter++;	//		goto carp;	//	}	//}	//if (i == 4)	//	goto carp;
	//DRM_DEBUG_KMS("DUMP EDID START\n");	//for(i = 0 ; i < EDID_LENGTH; i += 16 )	//	DRM_DEBUG_KMS("0x%x,0x%x,0x%x,0x%x,0x%x,0x%x,0x%x,0x%x,0x%x,0x%x,0x%x,0x%x,0x%x,0x%x,0x%x,0x%x\n",block[i],block[i+1],block[i+2],block[i+3],block[i+4],block[i+5],block[i+6],block[i+7],block[i+8],block[i+9],block[i+10],block[i+11],block[i+12],block[i+13],block[i+14],block[i+15]);	//DRM_DEBUG_KMS("\nDUMP EDID END\n");
	DRM_DEBUG_KMS("Overwriting EDID\n");	//DRM_DEBUG_KMS("EDID_LENGTH: %d\n",EDID_LENGTH);
	for(i = 0; i < 256; i++)		block[i]=block1[i];		
	return block;
	/* if there's no extensions, we're done */	if (block[0x7e] == 0)		return block;
	new = krealloc(block, (block[0x7e] + 1) * EDID_LENGTH, GFP_KERNEL);	if (!new)		goto out;	block = new;
	for (j = 1; j <= block[0x7e]; j++) {		for (i = 0; i < 4; i++) {			if (drm_do_probe_ddc_edid(adapter,				  block + (valid_extensions + 1) * EDID_LENGTH,				  j, EDID_LENGTH))				goto out;			if (drm_edid_block_valid(block + (valid_extensions + 1) * EDID_LENGTH)) {				valid_extensions++;				break;			}		}		if (i == 4)			dev_warn(connector->dev->dev,			 "%s: Ignoring invalid EDID block %d.\n",			 drm_get_connector_name(connector), j);	}
	if (valid_extensions != block[0x7e]) {		block[EDID_LENGTH-1] += block[0x7e] - valid_extensions;		block[0x7e] = valid_extensions;		new = krealloc(block, (valid_extensions + 1) * EDID_LENGTH, GFP_KERNEL);		if (!new)			goto out;		block = new;	}
	return block;
carp:	dev_warn(connector->dev->dev, "%s: EDID block %d invalid.\n",		 drm_get_connector_name(connector), j);
out:	kfree(block);	return NULL;}
> Date: Wed, 16 May 2012 15:48:55 -0400
> From: cahunter@cbnco.com
> To: intel-gfx@lists.freedesktop.org
> Subject: [Intel-gfx] Specific resolution without monitor
> 
> I'm trying to set my xorg.conf file up so that I get a specific 
> resolution when my monitor is turned off and I reboot my PC.  lspci 
> shows that I've got a 945GME and Xorg.0.log shows that I'm using version 
> 2.17.0 of the Intel driver.  I'm running Mythbuntu 11.10.  With my other 
> systems running the nvidia driver I can use the option 
> "ConnectedMonitor" to achieve this.  I guess I'm looking for the 
> equivalent for the Intel driver.
> 
> Thanks
> 
> Carl
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> http://lists.freedesktop.org/mailman/listinfo/intel-gfx
 		 	   		  

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