[Bug 17902] [830M missing dvo driver] need support for DVO-LVDS via na2501

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



https://bugs.freedesktop.org/show_bug.cgi?id=17902

--- Comment #76 from Daniel Vetter <daniel@xxxxxxxx> 2012-05-29 12:20:12 PDT ---
On Tue, May 29, 2012 at 9:13 PM,  <bugzilla-daemon@xxxxxxxxxxxxxxx> wrote:
> --- Comment #75 from thor@xxxxxxxxxxxxxxxxx 2012-05-29 12:13:12 PDT ---
> Well, I do have a documentation from National Semiconductors, but there is
> nothing that would define frequencies or bandwidths - only the sync pulses can
> be set, and intput to syncs. So I played writing values into all other
> registers with i2cset, but with little success - not any change, actually,
> except for the mentioned register. Ok, and you could block off the screen as
> well by disabling the sync pulses (not much of a surprise, I guess).

Well, most lvds panels have a fixed mode they work at. We fake
different resolutions by using the hw scaler on the gpu's scanout
unit. Still, having a dvo chip without any means to adjust that sounds
a bit strange.

> However, leaving all that aside - I'm no longer able to talk to the chip, upon
> rebooting i2cdetect gave me all blanks on bus #6. I really wonder what is going
> on. Could it be that there is some additional "gating" going on that blocks off
> access to this chip unless another register is set? Is that typical?

We do have some parts of the mmio space that need unlocking, but i2c
devices should always respond. You might need to power cycle the
machine to get it out of limbo though (i.e. yank the battery).

-- 
Configure bugmail: https://bugs.freedesktop.org/userprefs.cgi?tab=email
------- You are receiving this mail because: -------
You are the assignee for the bug.
_______________________________________________
dri-devel mailing list
dri-devel@xxxxxxxxxxxxxxxxxxxxx
http://lists.freedesktop.org/mailman/listinfo/dri-devel


[Index of Archives]     [Linux DRI Users]     [Linux Intel Graphics]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]     [XFree86]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Linux Kernel]     [Linux SCSI]     [XFree86]
  Powered by Linux