From: Keith Packard <keithp@keithp.com>
To: Takashi Iwai <tiwai@suse.de>
Cc: intel-gfx@lists.freedesktop.org
Subject: Re: Broken LVDS output at mode changes
Date: Thu, 29 Mar 2012 09:57:41 -0700 [thread overview]
Message-ID: <86398rny4a.fsf@sumi.keithp.com> (raw)
In-Reply-To: <s5hehsbtmgn.wl%tiwai@suse.de>
<#part sign=pgpmime>
On Thu, 29 Mar 2012 18:12:56 +0200, Takashi Iwai <tiwai@suse.de> wrote:
> The strange thing is that, although you can recover the display by
> turning off LVDS and on again once when the problem happens, but then
> the display starts flickering. And, the flickering continues even
> after reboot on BIOS boot screen.
Yeah, it's clearly the panel which is confused. It would be nice to know
what happened to the LVDS signal which caused this problem with the
panel.
> BTW, now I tested to disable LVDS unconditionally on different
> platforms as Daniel suggested. All worked fine, and I saw no
> regressions. Tested on IVY, SNB, ILK, GM45 and PineView.
That's not surprising -- pre-PCH platforms disabled the LVDS
anyways.
I wonder if we could fix this by being more careful about the order of
register operations during LVDS mode setting...
--
keith.packard@intel.com
next prev parent reply other threads:[~2012-03-29 16:57 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-03-28 13:29 Broken LVDS output at mode changes Takashi Iwai
2012-03-29 12:16 ` Daniel Vetter
2012-03-29 12:44 ` Chris Wilson
2012-03-29 12:51 ` Daniel Vetter
2012-03-29 12:55 ` Takashi Iwai
2012-03-29 15:07 ` Keith Packard
2012-03-29 16:12 ` Takashi Iwai
2012-03-29 16:57 ` Keith Packard [this message]
2012-03-29 18:02 ` Takashi Iwai
2012-03-30 4:27 ` Keith Packard
2012-03-30 16:56 ` Jesse Barnes
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