[haiku-bugs] Re: [Haiku] #7787: VESA regression: 640x480 no longer works at boot (but works in Screen prefs!)
- From: "ttcoder" <trac@xxxxxxxxxxxx>
- Date: Thu, 14 Jul 2011 09:08:40 -0000
#7787: VESA regression: 640x480 no longer works at boot (but works in Screen
prefs!)
----------------------------------+-----------------------
Reporter: ttcoder | Owner: axeld
Type: bug | Status: new
Priority: normal | Milestone: R1
Component: System/Boot Loader | Version: R1/alpha3
Resolution: | Keywords:
Blocked By: | Blocking:
Has a Patch: 0 | Platform: x86
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Comment (by ttcoder):
A bit of feedback:
- Found a [http://dev.haiku-
os.org/browser/haiku/trunk/src/preferences/screen/gtf.cpp gtf.cpp] file in
apps/preferences/Screen, looks like it had already been done a couple
years back.. Wished I had looked before, it's a bit late to warn you now
:-x
- Examining the Screen preflet more, I think I understand the sequence to
be like thus: Screen [http://dev.haiku-
os.org/browser/haiku/trunk/src/preferences/screen/ScreenMode.cpp#L162
calls] ->BScreen::GetModes(), which -> gets to the server side
(app_server) Screen class, which -> calls AccelerantHWInterface's
[http://dev.haiku-
os.org/browser/haiku/trunk/src/servers/app/drawing/AccelerantHWInterface.cpp#L733
accelerant hook] ... which might (or might not, in the case of older
drivers) call create_display_modes() (in accelerants/common).
- So in short, the Screen preflet relies on the accelerant to call (or
not) create_display_modes(), which is needed to get the best possible
listing of modes (from all sources: EDID Vesa modes, EDID Std modes, EDID
DetailedMonitor mode, the hardcoded base modes list, the whole shebang).
- So next I have to dig in the bootloader's video.cpp file to see if it
does the same (call create_display_modes()) or not..
Ok off I go to try the latest nightly first.
--
Ticket URL: <http://dev.haiku-os.org/ticket/7787#comment:5>
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