Hi J. E.
Is it possible for you to send us some code related to this ? Maybe the
important parts only.
I think it'll be easier to try to help.
Thanks
Rafael R. Machado
2014-10-08 19:43 GMT-03:00 J. E. <nszero...@hotmail.com>:
> 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 Regards
> Rafael 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.
>
>
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