Video BIOS messages not showing up on startup before BIOS POST screen

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grommit2007
Posts: 21
Joined: Sat 22 Apr, 2017 3:26 pm

Video BIOS messages not showing up on startup before BIOS POST screen

Post by grommit2007 » Sun 14 Apr, 2019 11:20 pm

I have noticed that in PCem versions before 13, (up to PCem v12) if a graphics card had a startup message in its ROM, it would appear for a few seconds before the motherboard BIOS POST screen appears. From PCem v13 onwards, the graphics card startup messages in its ROM still appear, but they appear for seemingly less than a milisecond (or not at all depending on the selected motherboard or graphics card).

Is there a possible cause for this?

JosepMa
Posts: 139
Joined: Tue 20 Jun, 2017 6:25 pm

Re: Video BIOS messages not showing up on startup before BIOS POST screen

Post by JosepMa » Tue 16 Apr, 2019 7:05 pm

With the released version of v14, AMI winbios and Trident TVGA, I see the trident message during two seconds, so it seems there's something more in your setup that could be causing this misbehaviour. (video speed is set to default)

ecksemmess
Posts: 155
Joined: Wed 18 Mar, 2015 5:27 am

Re: Video BIOS messages not showing up on startup before BIOS POST screen

Post by ecksemmess » Wed 08 May, 2019 4:12 am

I can confirm this problem (in stock v14, can't test svn at the moment). Definitely a bummer, would love to see this fixed for the v15 release!

To shed further light on how to reproduce this: only Pentium-class machines are affected. To reproduce, create a setup with any Pentium-class board (I've tested Award 430VX, Intel Premiere/PCI, Intel Advanced/EV, Intel Advanced/ZP), and any video card that displays a POST screen (I've tested Paradise Bahamas64, Number Nine 9FX, Phoenix S3 Trio64). The rest of the settings don't make any difference, the problem will happen regardless. Exactly as the OP says, the video card's POST message will flash for a vanishingly short fraction of a second before moving onto the main system POST.

While it may be tempting to write this off as a minor cosmetic problem, I would think it's definitely worth double checking the cause before finalizing v15, as it does seem like one of those things that could pay dividends in other areas if caught and fixed. The problem never occurs in 13.1, so in theory it should be easy to track down by simply identifying which commit introduced it, I guess?

SA1988
Posts: 243
Joined: Wed 30 Apr, 2014 9:38 am

Re: Video BIOS messages not showing up on startup before BIOS POST screen

Post by SA1988 » Mon 13 May, 2019 11:27 am

Well, revision 1168 caused this bug.

ecksemmess
Posts: 155
Joined: Wed 18 Mar, 2015 5:27 am

Re: Video BIOS messages not showing up on startup before BIOS POST screen

Post by ecksemmess » Mon 13 May, 2019 11:59 pm

Good work SA1988, thanks for checking that :)

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