[Bug 59572] [845G regression] on Linux 3.7/3.8: LED monitor "Auto Adjust in Progress" 6-10 seconds at boot

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=59572

--- Comment #2 from mlsemon35 at gmail.com ---
(In reply to comment #1)
> I guess the timings of your resolution slightly changed due to the slightly
> different video mode your now using. Which can take the screen longer to
> adjust to. Questions to check:

I guess it's best put this way:  For kernels 3.6.11 and prior, the default
fbcon boot goes like this:

> - does the screen eventually show the console, or does that sometimes fail?

I think I get the same results every time: A good cmdline leads to text on a
screen at the specified resolution.  A bad cmdline leads to no text on a blank
console.  Some settings of resolution and Hz seem to cause the driver to
default to the monitor's native resolution.  [Read more.]

What seems to change is the "same results" from kernel to kernel, and I've
forgotten what worked on my 3.6.11-EOL diaspora journey.  I think it went
3.6.11 to 3.7.{0,1} to 3.8-rc{1,2,3,4}.

> - if you have time, bisecting why the old video mode doesn't work on the
> kernel cmdline would be interesting.

Yes, that was interesting!  I didn't get too scientific with it, but looks like
the -8 switch leads to a blank screen each time.  -15, -16, -24, and -32 work,
though -24 seems to lead to the same results as -32.  The @Hz works, so long as
it matches a valid number for Hz.  Resolutions work, too, so long as they match
a valid number.  I didn't see a difference between using "M" and not using "M",
and really, I didn't notice it much when I thought it made a difference.  [It's
a holdover from my time using i810fb on an older PC.]

As for blank times and such, it went like this:

1024x768-32: 10s delay, rgba 8/16,8/8,8/0,0/0 (fbset)

800x600-16: 2s "Auto Adjust in Progress" shows over unblanked screen, real
blank time not noticed, rgba 5/11,6/5,5/0,0/0

800x600-8: booted to blank screen
640x480-8: booted to blank screen

640x480-15: 10s delay, rgba 5/10,5/5,5/0,1/15

1024x768M-16 at 75: OK, blank time was variable

1152x768-16: 2s blank

-16: 1280x1024 at 60, 16bpp, blank time not noticed

Hmmm...maybe my questions should include "What happened to 8bpp?"

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