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Punchcutter
Guru
Joined: 11 Feb 2007
Posts: 354
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 Posted: Mon Jun 17, 2013 9:13 pm Post subject: Radeon external display on DVI port not recognized |
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I'm installing a dual head setup on a Dell tower, with an internal Intel graphics chip and a Radeon HD 7570 on PCI bus. | Code: | # lspci | grep -i vga
00:02.0 VGA compatible controller: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller (rev 09)
01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Turks PRO [Radeon HD 7570]
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Intel-driven display is working fine, but the system is not recognizing the monitor on the Radeon card. That monitor is an older VGA-type, attached to a DVI port on the card with a DVI-VGA adaptor. Everything works fine under Win7 (dual boot). In Gentoo, if I do xrandr, I see: | Code: | # xrandr
Screen 0: minimum 320 x 200, current 1280 x 1024, maximum 32767 x 32767
VGA1 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 376mm x 301mm
1280x1024 60.0*+ 75.0
1152x864 75.0
1024x768 75.1 60.0
800x600 75.0 60.3
640x480 75.0 60.0
720x400 70.1
HDMI1 disconnected (normal left inverted right x axis y axis)
DP1 disconnected (normal left inverted right x axis y axis)
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The HDMI port is on the Intel motherboard adapter, but the DisplayPort (DP1, right?) is on the Radeon card. So if DP1 is seen, why is my DVI -> VGA not being seen? It looks like I have kernel stuff set up properly, and radeon module loaded: | Code: | # zgrep -i radeon /proc/config.gz
CONFIG_DRM_RADEON=m
# CONFIG_DRM_RADEON_KMS is not set
CONFIG_FB_RADEON=m
CONFIG_FB_RADEON_I2C=y
CONFIG_FB_RADEON_BACKLIGHT=y
# CONFIG_FB_RADEON_DEBUG is not set
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| Code: | # lsmod | grep -i rade
radeon 858404 0
ttm 58739 1 radeon
drm_kms_helper 26569 2 i915,radeon
cfbfillrect 3714 2 i915,radeon
cfbimgblt 2039 2 i915,radeon
cfbcopyarea 3350 2 i915,radeon
fb 51085 7 i915,fbcon,drm_kms_helper,radeon,softcursor,tileblit,bitblit
backlight 4248 2 video,radeon
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I also merged radeontool and radeon-ucode, but neither of these seems helpful. The radeontool doesn't really tell me anything useful, beyond that it sees the card.
I'm running a recent kernel (3.8.13) and latest stable (amd64) xorg-server and drivers. Any advice or help with this will be gratefully received. |
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chithanh
Developer
Joined: 05 Aug 2006
Posts: 2158
Location: Berlin, Germany
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| Posted: Mon Jun 17, 2013 10:07 pm Post subject: |
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| radeontool or radeon-ucode don't help you there. You need >=xrandr-1.4 and set the radeon's VGA output as sink (If intel is primary). See "man xrandr" for more details. |
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Punchcutter
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Joined: 11 Feb 2007
Posts: 354
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| Posted: Tue Jun 18, 2013 3:15 am Post subject: |
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Thanks! I've upgraded my xrandr to 1.4 and looked at the man page, but.... it's really not very helpful. That's being generous. I have to classify this as "still very poorly documented functionality" 
I googled around and found this fairly helpful discussion. However even this is insufficient for me to really figure out what I need to do.
On a practical note, I tried doing xrandr --listproviders, but it doesn't show my Radeon card at all: | Code: | # xrandr --listproviders
Providers: number : 1
Provider 0: id: 0x45 cap: 0xb, Source Output, Sink Output, Sink Offload crtcs: 3 outputs: 3 associated providers: 0 name:Intel
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I take this as a rather bad sign
After spending some time on this, I remembered an old email exchange I had a few years ago with someone in which they seemed to suggest that unifying two different GPUs into a single X desktop was something that was impossible at the time in Xorg, even though I had thought it must be something obviously possible. Even as I was attempting to do the same thing on my current install, I had forgotten about that email. Now I think I understand what this is all about.... these new features in 1.4 are the incipient attempt to fix that situation..... no?
Any further pointers are much appreciated! I suppose I can find an easy solution if I just get a monitor with an HDMI input, and connect it to my Intel adaptor, thus circumventing the problem of two GPUs. |
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chithanh
Developer
Joined: 05 Aug 2006
Posts: 2158
Location: Berlin, Germany
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| Posted: Tue Jun 18, 2013 6:26 am Post subject: |
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It is possible to use multiple GPUs since xrandr 1.4.
You need to ensure that you have the kernel and X drivers and firmware for the radeon card correctly set up, see http://www.gentoo.org/doc/en/xorg-config.xml |
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Punchcutter
Guru
Joined: 11 Feb 2007
Posts: 354
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| Posted: Wed Jun 19, 2013 1:27 am Post subject: |
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Thanks again, chithanh.... so, now I believe I have my radeon drivers, firmware, etc all set up properly.... even rebuilt my xorg-server, just for kicks  rebooted, of course...
Just calling plain old xrandr still does not show me any more possible outputs, just the same as I've seen before: | Code: | # xrandr
Screen 0: minimum 320 x 200, current 1280 x 1024, maximum 32767 x 32767
VGA1 connected 1280x1024+0+0 (normal left inverted right x axis y axis) 376mm x 301mm
1280x1024 60.0*+ 75.0
1152x864 75.0
1024x768 75.1 60.0
800x600 75.0 60.3
640x480 75.0 60.0
720x400 70.1
HDMI1 disconnected (normal left inverted right x axis y axis)
DP1 disconnected (normal left inverted right x axis y axis)
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HOWEVER, I do now get this: | Code: | # xrandr --listproviders
Providers: number : 2
Provider 0: id: 0x87 cap: 0xb, Source Output, Sink Output, Sink Offload crtcs: 3 outputs: 3 associated providers: 1 name:Intel
Provider 1: id: 0x57 cap: 0xd, Source Output, Source Offload, Sink Offload crtcs: 6 outputs: 2 associated providers: 1 name:radeon
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Now if I run the xrandr commands, both commands, both ways (not being sure which is right), I find that each command will simply output an error if I try to call it with the providers the reverse of what it thinks is possible. But then, if I do: | Code: | | xrandr --setprovideroffloadsink 1 0 |
I just get my bash prompt back with no obvious result. OTOH, if I do: | Code: | | xrandr --setprovideroutputsource 0 1 |
my screen (the usual one that works ) goes black, and I have to force a reboot.
Any more hints?  |
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Ant P.
Watchman
Joined: 18 Apr 2009
Posts: 6920
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| Posted: Wed Jun 19, 2013 1:55 am Post subject: |
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| Your video outputs aren't physically connected to the radeon so trying to use --setprovideroutputsource in that way will never work. |
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Punchcutter
Guru
Joined: 11 Feb 2007
Posts: 354
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| Posted: Thu Jun 20, 2013 9:19 pm Post subject: |
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Ant P., my second monitor is physically connected to the Radeon (3rd party) card, although through a DVI>VGA adaptor.
I didn't mention earlier than when I boot up, a small chunk of the usual startup messages (just about 20 lines) is mirrored onto the second monitor. So something is going on there... it's not completely hopeless Just not sure where to go from here. |
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