Re: long delay when using HMDI output on RS780

[Jerome Glisse]

On Mon, May 9, 2011 at 11:22 PM, Thomas Fjellstrom <thomas@xxxxxxxxxxxxx> wrote:
> On May 9, 2011, Thomas Fjellstrom wrote:
>> On May 9, 2011, Alex Deucher wrote:
>> > On Mon, May 9, 2011 at 5:04 PM, Thomas Fjellstrom <thomas@xxxxxxxxxxxxx>
>>
>> wrote:
>> > > On May 9, 2011, Thomas Fjellstrom wrote:
>> > >> On May 9, 2011, Jerome Glisse wrote:
>> > >> > On Mon, May 9, 2011 at 3:50 PM, Thomas Fjellstrom
>> > >> > <thomas@xxxxxxxxxxxxx>
>> > >>
>> > >> wrote:
>> > >> > > On May 7, 2011, Thomas Fjellstrom wrote:
>> > >> > >> I just switched to using HDMI with my media center, and its
>> > >> > >> causing a 30+ second delay in the screen turning on, as well as
>> > >> > >> a 7 second delay in the X startup when it tries to fetch the
>> > >> > >> EDID
>> > >> > >> information. Basically I don't get any picture at all once KMS
>> > >> > >> initializes until after X has been up a few seconds.
>> > >> > >>
>> > >> > >> The odd thing is the monitor seems to think something is going
>> > >> > >> on, since it doesn't go to sleep or display its "No Signal" OSD,
>> > >> > >> but just after X starts up, it pops up the "Input
>> > >> > >> detected/switched" OSD, and the picture appears.
>> > >> > >>
>> > >> > >> The bios, grub2 (in both text mode and graphics mode), and the
>> > >> > >> initial linux kernel messages all display fine and immediately.
>> > >> > >> Its only once KMS and radeondrmfb initializes that there's a
>> > >> > >> problem (at least till X starts up).
>> > >> > >>
>> > >> > >> I've just built with a vanila 2.6.38.4 kernel from the stable git
>> > >> > >> repo, and have played with some EDID settings, trying to disable
>> > >> > >> edid where I could thinking thats what caused the problem. That
>> > >> > >> doesn't seem to be the case though. I also tried playing with the
>> > >> > >> video= kernel option, trying to force disable VGA-1, and set a
>> > >> > >> static mode for HDMI-A-1, but if I try, it seems to force disable
>> > >> > >> HDMI-A-1 instead of force the mode.
>> > >> > >>
>> > >> > >> With a DVI-D cable instead, the problem goes away.
>> > >> > >>
>> > >> > >> Attached are the dmesg and xorg.log files for the latest boot
>> > >> > >> with HDMI (no video= parameter, and EDID enabled, most settings
>> > >> > >> at defaults).
>> > >> > >>
>> > >> > >> What exactly would cause this, and is there a way I can fix it?
>> > >> > >
>> > >> > > I've been playing around with it more, and got it to not blank the
>> > >> > > screen after KMS init, /once/. So far no luck repeating that
>> > >> > > success.
>> > >> > >
>> > >> > > I've tried late, and early kms init, and currently have the radeon
>> > >> > > module and firmware compiled into the kernel. Boot times at least
>> > >> > > are fairly decent, about 8-10s till X starts, but about 25-35s
>> > >> > > till anything shows up.
>> > >> > >
>> > >> > > Some strangeness, I have the kernel set to force the hdmi output
>> > >> > > to on, with a very specific mode, that X tends to like, the vga
>> > >> > > port is forced disabled. X is set to ignore EDID, and also set to
>> > >> > > that specific mode that it tends to auto set itself. Regardless X
>> > >> > > still wants to pause for 7s 2-3 times while processing EDID info.
>> > >> > >
>> > >> > > I've attached the new dmesg and xorg logs from the latest
>> > >> > > attempts.
>> > >> > >
>> > >> > > Note, this only happens with KMS, with HDMI. disabling KMS, or
>> > >> > > using DVI makes the problem go away. Even grub's own graphical
>> > >> > > mode works fine, its only once KMS inits that things go bad, and
>> > >> > > its not till after X is up for a few seconds that something
>> > >> > > displays on my screen.
>> > >> > >
>> > >> > > --
>> > >> > > Thomas Fjellstrom
>> > >> > > thomas@xxxxxxxxxxxxx
>> > >> >
>> > >> > Please boot with drm.debug=4 and attach dmesg it should be more
>> > >> > verbose. You might also want to try booting with radeon.audio=0
>> > >>
>> > >> Hi, attached both one with just drm.debug=4, and one with that and
>> > >> radeon.audio=0.
>> > >>
>> > >> Now, I'm guessing its a bug in my monitor claiming it can do HDMI
>> > >> audio? As setting radeon.audio=0 seems to have fixed the blanking
>> > >> problem. And the dmesg logs seem to claim that radeon thinks it can
>> > >> do HDMI audio.
>> >
>> > Most likely the driver is sending the wrong packets for hdmi audio.
>> > Until that gets fixed up, it's probably best to disable hdmi audio if
>> > it's not working for you.
>>
>> Ok. I'll do that for now, since I have no need for HDMI audio atm. My
>> receiver is only capable of Dolby Pro Logic input, so eh.
>>
>> Would be nice to fix the xorg pauses. And whatever is causing the massive
>> amounts of drm log spam (yes, I could disable drm.debug, but that would
>> just hide the issue, as whatever it is, will keep doing whatever it is
>> doing regardless).
>
> Any hints on where to look to fix the stalls when the xorg radeon driver starts
> up?
>

Is the Xserver block or is it just that there is no picture ? ie when
you see somethings on the screen is it directly the gnome login screen
or what ever should come first ? or do you then see gnome loading ?

If it's just black and then you directly got gnome-shell it's likely
that your tv doesn't live hdmi mode change and take time before
showing the picture.

Cheers,
Jerome
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