[Openchrome-devel] [Bug 91966] No signal to monitor with X and openchrome using VX855 chipset graphics

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Mon Nov 30 15:15:52 PST 2015


--- Comment #95 from Kevin Brace <kevinbrace at gmx.com> ---
Hi Christopher,

Just to let you know, I have not forgotten your bug.
I have been spending time learning how OpenChrome works, and have made about 8
patches so far.
There is a lot problems in the way the code is written, so most of the patches
I have created mainly address those issues.
I will post them in the next few days.
One of the big fix I was able to make is the laptop LCD backlight turn off
feature that was never implemented in OpenChrome.
I was able to confirm that I can now turn off the laptop LCD backlight via
power manager type of utility built into the OS (tested with Lubuntu 12.04
Currently, OpenChrome can turn off the screen itself, but not the laptop LCD
This is not nice for people running VIA Technologies integrated graphics
    My original interest in working on OpenChrome's code was to fix my laptop's
ACPI S3 State resume bug, and made a lot of progress in the past 2 days (have
been working on the bug since July 2015).
The developer made a poor assumption regarding LVDS-based LCD state (i.e.,
laptop LCD), so I made some changes to the code.
For now, the screen does come back on after resuming from ACPI S3 State
(previously, it was losing it completely), but due to video PLLs not being set
up correctly (my current guess as to why the laptop screen is messed up), the
laptop LCD screen is pretty messed up at this point.
    Regarding your bug, it appears that OpenChrome code structure change
dramatically between Version 0.2.9 and Version 0.3.3.
Lots of code were moved to via_ums.c, and in this process of restructuring the
code, a regression occurred.
I will continue to spend some time on learning how memory allocation is being
done, because I suspect that is the reason why it doesn't work with VX855
My ISP lost my home Internet access (AT&T), so this has slowed me down
considerably for the past 5 days.


Kevin Brace

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