The reason is that video driver uses INT 10h 4F15 service to read monitor’s
EDID information. The resolution information as blow is reflected by each
bit of VESA_BIOS_EXTENSIONS_EDID_DATA_BLOCK
.EstablishedTimings[3]. You can refer to mEstablishedEdidTiming defined in
BiosVideo.c. There is no information about the resolution other than these.
I guess this could be the limitation of VESA/VBE 3.0.
Wondering if there is any other interface to get these information.
Thanks,
Hawk.
发件人: Li, Elvin [mailto:[email protected]]
发送时间: 2012年11月27日 12:02
收件人: [email protected]
主题: Re: [edk2] 答复: 答复: Question about BIOS Video Driver
Hi,
Sorry, I misunderstand. You said the monitor and video controller
support both of 1280*1024 and 1920×1080, but ParseEdidData returing EDID
does not report 1920×1080? Do you know the reason? I never see this case
before. In my mind, EDID is the only source for code to know the monitor
resolution.
Thanks
Elvin
From: Li, Elvin [mailto:[email protected]]
Sent: Tuesday, November 27, 2012 11:53 AM
To: [email protected]
Subject: Re: [edk2] 答复: 答复: Question about BIOS Video Driver
I think 1920x1080 may not be set successfully and no video may not display,
because monitor does not support it. I do not really try such scenario.
From: Hawk [mailto:[email protected]]
Sent: Tuesday, November 27, 2012 11:48 AM
To: [email protected]
Subject: [edk2] 答复: 答复: Question about BIOS Video Driver
Elvin,
I’m not sure if there is any confusion. Take one example, if the monitor
and video controller support both of 1280*1024 and 1920×1080, EDID
information can only tell us 1280*1024 is supported, but nothing about
1920*1080. So if we want to force to set this mode, what will happen?
Thanks,
Hawk.
发件人: Li, Elvin [mailto:[email protected]]
发送时间: 2012年11月27日 11:00
收件人: [email protected]
主题: Re: [edk2] 答复: Question about BIOS Video Driver
Hi:
When adding a new mode into GOP modes, BiosVideo uses
SearchEdidTiming make a check with EDID and each resolution. ParseEdidData
only fills EDID data for SearchEdidTiming’s use.
if (EdidFound && (ValidEdidTiming.ValidNumber > 0)) {
//
// EDID exist, check whether this mode match with any mode in EDID
//
Timing.HorizontalResolution =
BiosVideoPrivate->VbeModeInformationBlock->XResolution;
Timing.VerticalResolution =
BiosVideoPrivate->VbeModeInformationBlock->YResolution;
if (!SearchEdidTiming (&ValidEdidTiming, &Timing)) {
continue;
}
}
Elvin
From: Hawk [mailto:[email protected]]
Sent: Tuesday, November 27, 2012 10:50 AM
To: [email protected]
Subject: [edk2] 答复: Question about BIOS Video Driver
Hi Elvin,
We want to set the highest resolution supported by both of video controller
and monitor during POST. Also I agree with you about the proposed solution
as below to have BiosVideo driver achieve this.
But the key point is the current implementation of BIOS video can only
determine if the following resolution can be supported or not in VBE 3.0
interface. Check ParseEdidData() for detailes.
n 640 * 480
n 720 * 400
n 800 * 600
n 832 * 624
n 1024 *768
n 1280 * 1024
Is there other interface to convey information of higher resolution, if they
are supported by both of video controller and monitor?
Thanks,
Hawk.
发件人: Li, Elvin [mailto:[email protected]]
发送时间: 2012年11月27日 10:30
收件人: [email protected]
主题: Re: [edk2] Question about BIOS Video Driver
Hi:
You would use GraphicsOutputProtocol->QueryMode to get all the
resolutions at first, these resolutions returned has been supported by both
monitor and video controller, then you can do like GraphicsConsole.c does to
find the highest resolution:
MaxMode = Private->GraphicsOutput->Mode->MaxMode;
for (ModeIndex = 0; ModeIndex < MaxMode; ModeIndex++) {
Status = Private->GraphicsOutput->QueryMode (
Private->GraphicsOutput,
ModeIndex,
&SizeOfInfo,
&Info
);
if (!EFI_ERROR (Status)) {
if ((Info->HorizontalResolution >= HorizontalResolution) &&
(Info->VerticalResolution >= VerticalResolution)) {
HorizontalResolution = Info->HorizontalResolution;
VerticalResolution = Info->VerticalResolution;
ModeNumber = ModeIndex;
}
FreePool (Info);
}
}
What is your purpose? If you want to let BiosVideo driver to set
video mode to highest resolution directly, you could set
PcdVideoHorizontalResolution and PcdVideoVerticalResolution to 0x0 to make
BiosVideo to set highest resolution.
Thanks
Elvin
From: Hawk [mailto:[email protected]]
Sent: Tuesday, November 27, 2012 9:54 AM
To: [email protected]
Subject: [edk2] Question about BIOS Video Driver
Hi Experts,
In ParseEdidData() in
IntelFrameworkModulePkg\Csm\BiosThunk\VideoDxe\BiosVideo.c, the EDID
information pointed by EdidBuffer is in the format of VBE 3.0 and retrieved
by int 10 4F15. According to the definition of following timing fields,
1280*1024 should be the highest resolution to be supported in this way.
EstablishedTimings[0]:
Bitfields for DPMS established timings 1:
Bit(s) Description
0 720x400 @ 70 Hz (VGA 640x400, IBM)
1 720x400 @ 88 Hz (XGA2)
2 640x480 @ 60 Hz (VGA)
3 640x480 @ 67 Hz (Mac II, Apple)
4 640x480 @ 72 Hz (VESA)
5 640x480 @ 75 Hz (VESA)
6 800x600 @ 56 Hz (VESA)
7 800x600 @ 60 Hz (VESA)
EstablishedTimings[1]:
Bitfields for DPMS established timings 2:
Bit(s) Description
0 800x600 @ 72 Hz (VESA)
1 800x600 @ 75 Hz (VESA)
2 832x624 @ 75 Hz (Mac II)
3 1024x768 @ 87 Hz interlaced (8514A)
4 1024x768 @ 60 Hz (VESA)
5 1024x768 @ 70 Hz (VESA)
6 1024x768 @ 75 Hz (VESA)
7 1280x1024 @ 75 Hz (VESA)
Our question is if there is one way to retrieve the information about higher
resolution, if it’s supported by video output device?
Thanks,
Hawk.
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