Public bug reported:
Using Kubuntu Trusty Daily as of 3/18.
I have two Caicos XTX [Radeon HD 8490 / R5 235X OEM], with 3 monitors.
Machine is an Optiplex 9020.
2 monitors are plugged in (hdmi and display port) to the first card.
Another monitor is plugged (hdmi) in to the second card.
The second monitor is not recognized and does not turn on. It is not
listed under the Display Configuration.
This works fine under 13.10 with the open source drivers as well.
lspci output:
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Caicos XTX [Radeon HD 8490 / R5 235X OEM] (prog-if 00 [VGA controller])
Subsystem: Dell Device 2120
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR- INTx-
Latency: 0, Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 47
Region 0: Memory at e0000000 (64-bit, prefetchable) [size=256M]
Region 2: Memory at f7e20000 (64-bit, non-prefetchable) [size=128K]
Region 4: I/O ports at e000 [size=256]
Expansion ROM at f7e00000 [disabled] [size=128K]
Capabilities: <access denied>
Kernel driver in use: radeon
03:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Caicos XTX [Radeon HD 8490 / R5 235X OEM] (prog-if 00 [VGA controller])
Subsystem: Dell Device 2120
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx+
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR- INTx-
Latency: 0, Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 48
Region 0: Memory at d0000000 (64-bit, prefetchable) [size=256M]
Region 2: Memory at f7d20000 (64-bit, non-prefetchable) [size=128K]
Region 4: I/O ports at d000 [size=256]
Expansion ROM at f7d00000 [disabled] [size=128K]
Capabilities: <access denied>
Kernel driver in use: radeon
ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: xorg 1:7.7+1ubuntu8
ProcVersionSignature: Ubuntu 3.13.0-17.37-generic 3.13.6
Uname: Linux 3.13.0-17-generic x86_64
ApportVersion: 2.13.3-0ubuntu1
Architecture: amd64
CurrentDesktop: KDE
Date: Tue Mar 18 10:15:01 2014
InstallationDate: Installed on 2014-03-18 (0 days ago)
InstallationMedia: Kubuntu 14.04 LTS "Trusty Tahr" - Alpha amd64 (20140318)
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: xorg (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug trusty
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https://bugs.launchpad.net/bugs/1294143
Title:
Third monitor not recognized on dual Radeon HD 8490 cards
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