[Openchrome-devel] [Bug 100679] Garbled graphics when resuming from standby

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=100679

--- Comment #48 from Kevin Brace <kevinbrace at gmx.com> ---
(In reply to Marty from comment #47)

Hi Marty,

> Hi Kevin,
> 
> No problem regarding no.1 and 2 of my list because I have workarounds
> available (setting in /etc/default/grub and "blind login").
> 

I am not 100% sure problem 1 and 2 are truly OpenChrome DDX related.
At this point, OpenChrome DDX is probably the only non-KMS DDX that tries to
even handle STR (Suspend to RAM or ACPI S3 State; the particular type of
standby mode we are dealing with) resume.


> But the third one (color depth) is little annoying because the "reduced
> color depth" is always there, meaning also directly after a fresh reboot,
> not only after resume. I tested that with that web-page (using Firefox):
> 
> http://www.lagom.nl/lcd-test/gradient.php
> 
> With the original Openchrome driver the gradient is completely smooth. With
> Version 0.6.133 I clearly see two rows of 64 Bands each. Whatever that
> means...
> 

I think this might be code changes I may have made while ago related to gamma
correction.
Does this problem show up prior to standby?
Personally, I will consider this a separate bug, and you may want to file a new
bug report.


> This page
> http://www.lagom.nl/lcd-test/display_settings.php
> says I would have a color depth of 24 bit. I get the same result (24 bit)
> with:
> xwininfo -root | grep Depth
> 
> So I have no clue where the color banding comes from.
> 
> Regarding VIA registers, I will be happy to provide you some values again.
> What exactly are you interested in? All registers? Before and after resume?
> Also before and after VT switching?
> 
> Best regards,
> Marty

The Xorg.0.log after the standby resume will be helpful.
Also, "via_regs_dump -d" after the standby resume is important.
Due to the color / monochrome register mapping issue that shows up, you may
have to resort to obtaining a few key register values one at a time.

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