linux-kernel - Re: Blank (disconnected) screen during boot with latest 2.6.35-rcX kernels

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Message-ID: <AANLkTiljMvaCttFAI_GoajBHwK9OHS5MPmx1P6_qDOdY@mail.gmail.com>
Date:	Tue, 20 Jul 2010 17:47:54 +0100
From:	trapDoor <trapdoor6@...il.com>
To:	Alex Deucher <alexdeucher@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, xorg-driver-ati@...ts.x.org,
	trapDoor <trapdoor6@...glemail.com>
Subject: Re: Blank (disconnected) screen during boot with latest 2.6.35-rcX 
	kernels

Hi Alex,

>
> Probably the oem made two similar boards one with dual DVI and one
> with DVI + VGA + HDMI and used the same connector table since the
> encoder routing is still correct even if the connectors are named
> wrong.  We can add a quirk to fix it.
>

I plugged my monitor into the other (white) DVI port and now system
recognises it as DVI:

[    18.418] (II) RADEON(0): Output HDMI-0 disconnected
[    18.418] (II) RADEON(0): Output VGA-0 disconnected
[    18.418] (II) RADEON(0): Output DIN disconnected
[    18.418] (II) RADEON(0): Output DVI-0 connected

As I mentioned before, I guess that on my card HDMI signal is
supported only on the yellow DVI port (through DVI > HDMI adapter),
and even if a device is connected to it directly the system will still
recognise it as HDMI.

>
> So the patch fixes the issue?  I'll send it on then.  Looks like your
> systems needs a connector table quirk.  Can you send me the pci ids
> for your GPU (lspci -vnn) and a copy of your vbios?  To dump your
> vbios (as root):
> cd /sys/bus/pci/devices/<pci bus id>
> echo 1 > rom
> cat rom > /tmp/vbios.rom
> echo 0 > rom
>

Yes, I confirm it does fix it.
Full lspci output attached and below pasting what's related to my graphics card:
--------------
04:00.0 VGA compatible controller [0300]: ATI Technologies Inc
Mobility Radeon HD 3600 Series [1002:9598]
	Subsystem: ASUSTeK Computer Inc. Device [1043:01e4]
	Flags: bus master, fast devsel, latency 0, IRQ 43
	Memory at d0000000 (64-bit, prefetchable) [size=256M]
	Memory at fbfe0000 (64-bit, non-prefetchable) [size=64K]
	I/O ports at e000 [size=256]
	Expansion ROM at fbfc0000 [disabled] [size=128K]
	Capabilities: <access denied>
	Kernel driver in use: radeon

04:00.1 Audio device [0403]: ATI Technologies Inc RV635 Audio device
[Radeon HD 3600 Series] [1002:aa20]
	Subsystem: ASUSTeK Computer Inc. Device [1043:aa20]
	Flags: bus master, fast devsel, latency 0, IRQ 45
	Memory at fbffc000 (64-bit, non-prefetchable) [size=16K]
	Capabilities: <access denied>
	Kernel driver in use: HDA Intel
--------------

Vbios dump for bus ID 0000:04:00.0 attached.

>
> As to the performance regressions, 2.6.35 added proper support for the
> glx vblank stuff, so you are likely seeing apps synchronized to the
> vrefresh.
>

I guess you were referring to the glxgears 'test tool' that used to
show (before 2.6.35-rc) much higher number of fps than it does now
when it corresponds to vertical-refresh like it's supposed to. I
noticed the change and assumed it is correct. And I never considered
glxgears as a proper performance test anyway so I wouldn't rely on the
results it gives.

Where I see a real 3D performance drop now is for example Armagetron
Advanced - a game I use just for testing. I enabled certain features
using 3D in it. Without going into details I just say that with kernel
2.6.34.1 the overall 3D performance in AA is about twice better. The
game runs quite smooth, number of fps doesn't go under 60. With kernel
2.6.35-rc5-git3 on the same system, with the same drivers, mesa, drm
etc., the game runs slower and not so smooth, certain details look
slightly worse and I won't get more than 35 fps.

Apart from that I don't notice any regressions on my desktop, with
compiz effects etc. I'd run some other tests if you could recommend
some tools, but not too complex and rather some specialised software
just for testing purposes, not games.

-- 
Regards,
trapDoor

Download attachment "lspci-output" of type "application/octet-stream" (8188 bytes)

Download attachment "0000:04:00.0_vbios.rom" of type "application/octet-stream" (64513 bytes)