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List:       freedesktop-xorg
Subject:    Re: Monitor doesn't display anything. EDID trouble ?
From:       Alex Deucher <alexdeucher () gmail ! com>
Date:       2011-10-24 21:43:21
Message-ID: CADnq5_Mcq61j7Jx7WqtmS+PsXGCNeCSJ44_nt1GAb_2A9JsQmg () mail ! gmail ! com
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On Mon, Oct 24, 2011 at 5:03 PM, Xavier Bestel <xavier.bestel@free.fr> wrot=
e:
> Le lundi 24 octobre 2011 =E0 15:16 -0400, Alex Deucher a =E9crit :
>> On Mon, Oct 24, 2011 at 3:01 PM, Xavier Bestel <xavier.bestel@free.fr> w=
rote:
>> > Hi,
>> >
>> > I know it may be off-topic, but the experience is there.
>> > I've just bought a used 30" monitor (HP ZR30w), and it doesn't display
>> > anything, even at BIOS time. The backlight is on, but I see nothing
>> > except a faint flickering at mode change times. Screen blanking works
>> > (the backlight switches off). I'm using a Radeon HD 5700 via DVI,
>> > debian/sid with kernel 3.1.0-rc7, Xorg 2:1.11.1.901-2 and radeon
>> > 1:6.14.2-2.
>> > After googling a bit, some people talk about a possible EDID problem
>> > (apparently it's possible to have the EDID somehow erased from the
>> > EEPROM ?). But Xorg.0.log does seem indicate that there's an EDID:
>> >
>> > [ =A0 =A021.829] (II) RADEON(0): Monitor name: HP ZR30w
>> > [ =A0 =A021.829] (II) RADEON(0): Serial No: CN4048041Z
>> > [ =A0 =A021.829] (II) RADEON(0): EDID (in hex):
>> > [ =A0 =A021.829] (II) RADEON(0): =A0 =A000ffffffffffff0022f06e28010101=
01
>> > [ =A0 =A021.829] (II) RADEON(0): =A0 =A03014010380402878ea8d85ad4f35b1=
25
>> > [ =A0 =A021.829] (II) RADEON(0): =A0 =A00e5054000000010101010101010101=
01
>> > [ =A0 =A021.829] (II) RADEON(0): =A0 =A0010101010101e26800a0a0402e6030=
20
>> > [ =A0 =A021.829] (II) RADEON(0): =A0 =A0360081902100001abc1b00a0502017=
30
>> > [ =A0 =A021.829] (II) RADEON(0): =A0 =A03020360081902100001a000000fc00=
48
>> > [ =A0 =A021.829] (II) RADEON(0): =A0 =A050205a523330770a20202020000000=
ff
>> > [ =A0 =A021.829] (II) RADEON(0): =A0 =A000434e343034383034315a0a202000=
66
>> > [ =A0 =A021.829] (II) RADEON(0): Printing probed modes for output DVI-0
>> > [ =A0 =A021.829] (II) RADEON(0): Modeline "2560x1600"x60.0 =A0268.50 =
=A02560 2608 2640 2720 =A01600 1603 1609 1646 +hsync -vsync (98.7 kHz)
>> > [ =A0 =A021.829] (II) RADEON(0): Modeline "1280x800"x59.9 =A0 71.00 =
=A01280 1328 1360 1440 =A0800 803 809 823 +hsync -vsync (49.3 kHz)
>> >
>> > ... and then:
>> >
>> > [ =A0 =A021.854] (II) RADEON(0): Output DVI-0 using initial mode 2560x=
1600
>> >
>> > Does anyone have an idea how I could pinpoint the problem ?
>>
>> The EDID looks ok to me. =A0Do any other modes work? =A0Try 1280x800. =
=A0Try
>> the other DVI port. =A0If the neither port lights up the monitor
>> (especially if the bios produces no display), it's probably a bad
>> monitor.
>
> OK, thanks to you I've found the problem
> 1) this monitor is apparently unable to display anything but 1280x800 or
> 2560x1600, so no BIOS nor GRUB for me.
> 2) my cable is single-link, so Xorg's default guess doesn't work.
>
> After hooking a second monitor, and choosing 1280x800 for the big one,
> everything's working (sort-of). I'll hunt for a dual-link or displayport
> cable, whichever is cheapest.
>
> Can Xorg detect if the cable is single-link ?

No.

Alex
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