[haiku-bugs] Re: [Haiku] #8001: Regression: intel_extreme mode setting
- From: "mmlr" <trac@xxxxxxxxxxxx>
- Date: Sun, 23 Oct 2011 15:44:21 -0000
#8001: Regression: intel_extreme mode setting
-------------------------------------+-------------------------------------
Reporter: jprostko | Owner: mmlr
Type: bug | Status: in-progress
Priority: high | Milestone: R1
Component: | Version: R1/Development
Drivers/Graphics/intel_extreme | Keywords: intel_extreme,
Resolution: | 1400x1050, mode
Blocked By: | Blocking:
Has a Patch: 0 | Platform: All
-------------------------------------+-------------------------------------
Changes (by mmlr):
* owner: axeld => mmlr
* status: new => in-progress
Comment:
I'm currently reworking some of the intel_extreme internals (to better
separate the various components of the display "chain"). I have already
looked over the constraints put in place and they do seem off for quite a
few configurations. I wasn't experiencing any black screens, but I can't
select a few modes that worked fine before anymore on pretty much all of
the systems with intel graphics (I actually got 5, tested only on 4 of
them though).
What definitely happend on this laptop (Thinkpad X1) was that the mode
retrieved from the panel was later not seen as valid (due to the
resolution being 1366x768 where 1366 didn't comply to the 8 resolution
granularity constraint). What I've seen pretty consistently so far is that
setting modes with 60Hz does not work anymore, unless it is the exactly
matching EDID mode. This is problematic in my case because the EDID mode
suggests 59Hz which we do simply not offer (the Screen prefs starts at
60Hz). 70Hz or anything up does work however.
So what I could imagine (without really remembering the code flow in the
app_server) is that on the affected systems, it was tried to set a mode
(with 60Hz probably), that failed, as did the fallback to the "native"
mode retrieved, resulting in a black screen.
I would have just adjusted the constraints, but even though I have a lot
of different intel graphics hardware, I honestly don't know what to put
there. In any case I will take ownership of this and fix it either
separately or as part of reworking the driver.
--
Ticket URL: <http://dev.haiku-os.org/ticket/8001#comment:17>
Haiku <http://dev.haiku-os.org>
Haiku - the operating system.
Other related posts:
