Blank (disconnected) screen during boot with latest 2.6.35-rcX kernels

[Alex Deucher]

On Tue, Jul 20, 2010 at 12:47 PM, trapDoor <trapdoor6 at gmail.com> wrote:
> 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.

Good.

> 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.
>

The attached patch should fix the connectors to report properly.
There are a number of similar ASUS cards with the same quirk.

>>
>> 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.

If it's just the kernel that changed is there any chance you could
bisect what caused the performance regression?

Alex
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