Thought as much, ok thanks for the info. I have worked around the issue.
Date: Wed, 8 Oct 2014 21:46:45 -0500
From: tcrog...@gmail.com
To: edk2-devel@lists.sourceforge.net
Subject: Re: [edk2] BltLibVideoToBltBuffer returns black pixels
If you know you have the right handle, the most likely problem is the GOP
driver. Almost every system I've come across has problems with driver
implementations. Even popular ones. Microsoft's Surface's Flush() for simple
file system doesn't work properly, for example. Many systems will crash with
improperly formatted boot entries. The list goes on. A lot of stuff doesn't get
used heavily and probably doesn't get tested heavily, either. You just kinda
have to work around it or limit your software to specific machines that you've
tested. I'm sure it will get better over time.
On Wed, Oct 8, 2014 at 5:43 PM, J. E. <nszero...@hotmail.com> wrote:
I always use the last handle in the handle list, it works on 100% of the PC's
Ive tested. Some PC's have 3 or 4 handles.
However I'd prefer to do it the correct way so I will query the protocol as
suggested.
I currently use:
nGOPHandleIndex = handleCount - 1;
Status = gBS->HandleProtocol(
handleBuffer[nGOPHandleIndex],
&gEfiGraphicsOutputProtocolGuid,
(VOID **)&(GraphicsOutput));
The PC that returns black pixels has 2 total handles.
If I choose the 1st handle, there is no graphics output at all. It stays on the
console text screen.
If I choose the 2nd handle, there is graphics output, but
BltLibVideoToBltBuffer returns black pixels.
So I am definitely using the correct handle for GOP graphics.
I was thinking maybe the BlitLib was using the 1st handle instead of the 2nd
handle, but I couldn't find a way to set the handle index in BlitLib. Even if
it was using the 1st handle, wouldn't I see bits of ASCII characters in the
returned blit from the console? I see no text, just black.
BltLibVideoToBltBuffer also has no option to set the handle.
So it seems the BIOS in question simply hasn't implemented proper
Screen-to-Blit functionality.
I suppose it's not a feature many people would use so it would be easy for some
BIOS developers to forget to test/implement this function.
Thanks.
Date: Wed, 8 Oct 2014 12:27:18 -0500
From: tcrog...@gmail.com
To: edk2-devel@lists.sourceforge.net
Subject: Re: [edk2] BltLibVideoToBltBuffer returns black pixels
Another way is to get it from the ConOut device path. There's a UEFI variable
called "ConOut" (refer to UEFI spec) that holds a device path. Doing a
LocateDevicePath() with gEfiGraphicsOutputProtocolGuid and this device path
gives you the handle to GOP that ConOut is using. Just OpenProtocol() with this
handle to get the GOP instance.
On Wed, Oct 8, 2014 at 11:17 AM, Rafael Machado
<rafaelrodrigues.mach...@gmail.com> wrote:
Hi J. E.
Just one question.Are you sure that this GOP you are using is handled by the
current active graphic device ?
I'm asking this because some time ago I had one problem like this, and the
situation was that my system had two gop handles, but the first one that was
detected was not related to the active device.
To check this I used the Edid protocol.
Thanks and RegardsRafael R. Machado
2014-10-03 3:15 GMT-03:00 J. E. <nszero...@hotmail.com>:
BltLibVideoToBltBuffer seems to be unreliable on some PC's. Most work fine, but
a select few return black pixels, no errors. EFI_STATUS = EFI_SUCCESS.
If BltLibVideoToBltBuffer returns black pixels does that mean the
hardware/firmware doesn't support screen-to-buffer functionality?
I assume this is because someone didnt test the function or feel the need to
implement the function in the BIOS code or GOP driver, rather than a GOP handle
issue.
------------------------------------------------------------------------------
Meet PCI DSS 3.0 Compliance Requirements with EventLog Analyzer
Achieve PCI DSS 3.0 Compliant Status with Out-of-the-box PCI DSS Reports
Are you Audit-Ready for PCI DSS 3.0 Compliance? Download White paper
Comply to PCI DSS 3.0 Requirement 10 and 11.5 with EventLog Analyzer
http://pubads.g.doubleclick.net/gampad/clk?id=154622311&iu=/4140/ostg.clktrk
_______________________________________________
edk2-devel mailing list
edk2-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/edk2-devel
------------------------------------------------------------------------------
Meet PCI DSS 3.0 Compliance Requirements with EventLog Analyzer
Achieve PCI DSS 3.0 Compliant Status with Out-of-the-box PCI DSS Reports
Are you Audit-Ready for PCI DSS 3.0 Compliance? Download White paper
Comply to PCI DSS 3.0 Requirement 10 and 11.5 with EventLog Analyzer
http://pubads.g.doubleclick.net/gampad/clk?id=154622311&iu=/4140/ostg.clktrk
_______________________________________________
edk2-devel mailing list
edk2-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/edk2-devel
------------------------------------------------------------------------------
Meet PCI DSS 3.0 Compliance Requirements with EventLog Analyzer
Achieve PCI DSS 3.0 Compliant Status with Out-of-the-box PCI DSS Reports
Are you Audit-Ready for PCI DSS 3.0 Compliance? Download White paper
Comply to PCI DSS 3.0 Requirement 10 and 11.5 with EventLog Analyzer
http://pubads.g.doubleclick.net/gampad/clk?id=154622311&iu=/4140/ostg.clktrk
_______________________________________________
edk2-devel mailing list
edk2-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/edk2-devel
------------------------------------------------------------------------------
Meet PCI DSS 3.0 Compliance Requirements with EventLog Analyzer
Achieve PCI DSS 3.0 Compliant Status with Out-of-the-box PCI DSS Reports
Are you Audit-Ready for PCI DSS 3.0 Compliance? Download White paper
Comply to PCI DSS 3.0 Requirement 10 and 11.5 with EventLog Analyzer
http://pubads.g.doubleclick.net/gampad/clk?id=154622311&iu=/4140/ostg.clktrk
_______________________________________________
edk2-devel mailing list
edk2-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/edk2-devel
------------------------------------------------------------------------------
Meet PCI DSS 3.0 Compliance Requirements with EventLog Analyzer
Achieve PCI DSS 3.0 Compliant Status with Out-of-the-box PCI DSS Reports
Are you Audit-Ready for PCI DSS 3.0 Compliance? Download White paper
Comply to PCI DSS 3.0 Requirement 10 and 11.5 with EventLog Analyzer
http://pubads.g.doubleclick.net/gampad/clk?id=154622311&iu=/4140/ostg.clktrk
_______________________________________________
edk2-devel mailing list
edk2-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/edk2-devel
------------------------------------------------------------------------------
Meet PCI DSS 3.0 Compliance Requirements with EventLog Analyzer
Achieve PCI DSS 3.0 Compliant Status with Out-of-the-box PCI DSS Reports
Are you Audit-Ready for PCI DSS 3.0 Compliance? Download White paper
Comply to PCI DSS 3.0 Requirement 10 and 11.5 with EventLog Analyzer
http://pubads.g.doubleclick.net/gampad/clk?id=154622311&iu=/4140/ostg.clktrk
_______________________________________________
edk2-devel mailing list
edk2-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/edk2-devel
