REGRESSION: dpms-on broken (drm_radeon,displayport)

Hi Benjamin,
Hi All,


i write to report a regression that happened after 2.6.34-rc3 and before
or including 2.6.34-rc4 and still persists on 2.6.35-rc2.

The effect is, that after DPMS-OFF, the monitor cannot be reactivated
locally by a key press or remotely via `xset dpms force on´.

I can work around the issue switching the monitor off and on again.

For the technical details of the local environment see below.
I can provide more information on request and offer help testing patches.



Kind regards

  Lars


--------------------------------


- config.gz attached, below some lines.

CONFIG_X86_64=y

CONFIG_DRM=y
CONFIG_DRM_KMS_HELPER=y
CONFIG_DRM_TTM=y
CONFIG_DRM_RADEON=y
CONFIG_DRM_RADEON_KMS=y
CONFIG_VIDEO_OUTPUT_CONTROL=y


- X11: find attached the Xorg.0.log for full information

X.Org X Server 1.7.7
Release Date: 2010-05-04
[..]
(**) |-->Screen "Default Screen" (0)
(**) |   |-->Monitor "DELL 2408WFP"
(**) |   |-->Device "ATI FireMV 2260"
[..]
(II) RADEON(0): Output DisplayPort-0 using monitor section DELL 2408WFP
[..]
(**) RADEON(0): DPMS enabled


- Notes from the kernel.log

following messages occur only >= 2.6.34-rc4. I think they are issued
when i `xset dpms force off´ or dpms is used automatically.

...

: [drm:dp_link_train] *ERROR* clock recovery tried 5 times
: [drm:dp_link_train] *ERROR* clock recovery failed
: [drm:dp_link_train] *ERROR* channel eq failed: 5 tries
: [drm:dp_link_train] *ERROR* channel eq failed

...

The following messages might be unrelated to the problem and occur
on 2.6.34-rc3 too, when i switch the monitor off/on.

: [drm:atom_dp_get_link_status] *ERROR* displayport link status failed
: [drm:atom_dp_get_link_status] *ERROR* displayport link status failed
: [drm:atom_dp_get_link_status] *ERROR* displayport link status failed

Below stuff from the initiation ...

...

: [drm] Initialized drm 1.1.0 20060810
: [drm] radeon defaulting to kernel modesetting.
: [drm] radeon kernel modesetting enabled.
: radeon 0000:01:00.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16
: radeon 0000:01:00.0: setting latency timer to 64
: [drm] radeon: Initializing kernel modesetting.
: [drm] register mmio base: 0x90200000
: [drm] register mmio size: 65536
: ATOM BIOS: 113
: [drm] Clocks initialized !
: [drm] Internal thermal controller with fan control
: [drm] 3 Power State(s)
: [drm] State 0 Default (default)
: [drm] 	16 PCIE Lanes
: [drm] 	3 Clock Mode(s)
: [drm] 		0 engine/memory: 500000/500000
: [drm] 		1 engine/memory: 500000/500000
: [drm] 		2 engine/memory: 500000/500000
: [drm] State 1 Performance 
: [drm] 	16 PCIE Lanes
: [drm] 	3 Clock Mode(s)
: [drm] 		0 engine/memory: 110000/252000
: [drm] 		1 engine/memory: 300000/396000
: [drm] 		2 engine/memory: 500000/500000
: [drm] State 2 Performance 
: [drm] 	16 PCIE Lanes
: [drm] 	3 Clock Mode(s)
: [drm] 		0 engine/memory: 450000/500000
: [drm] 		1 engine/memory: 450000/500000
: [drm] 		2 engine/memory: 500000/500000
: [drm] radeon: power management initialized
: radeon 0000:01:00.0: VRAM: 256M 0x00000000 - 0x0FFFFFFF (256M used)
: radeon 0000:01:00.0: GTT: 512M 0x10000000 - 0x2FFFFFFF
: [drm] Detected VRAM RAM=256M, BAR=256M
: [drm] RAM width 64bits DDR
: Available graphics memory: 1017548 kiB.
: [drm] radeon: 256M of VRAM memory ready
: [drm] radeon: 512M of GTT memory ready.
: radeon 0000:01:00.0: irq 30 for MSI/MSI-X
: [drm] radeon: using MSI.
: [drm] radeon: irq initialized.
: [drm] GART: num cpu pages 131072, num gpu pages 131072
: [drm] Loading RV620 Microcode
: platform radeon_cp.0: firmware: using built-in firmware radeon/RV620_pfp.bin
: platform radeon_cp.0: firmware: using built-in firmware radeon/RV620_me.bin
: platform radeon_cp.0: firmware: using built-in firmware radeon/R600_rlc.bin
: [drm] ring test succeeded in 1 usecs
: [drm] radeon: ib pool ready.
: [drm] ib test succeeded in 0 usecs
: [drm] Enabling audio support
: [drm] Radeon Display Connectors
: [drm] Connector 0:
: [drm]   DisplayPort
: [drm]   HPD2
: [drm]   DDC: 0x7e60 0x7e60 0x7e64 0x7e64 0x7e68 0x7e68 0x7e6c 0x7e6c
: [drm]   Encoders:
: [drm]     DFP1: INTERNAL_UNIPHY
: [drm] Connector 1:
: [drm]   DisplayPort
: [drm]   HPD4
: [drm]   DDC: 0x7e20 0x7e20 0x7e24 0x7e24 0x7e28 0x7e28 0x7e2c 0x7e2c
: [drm]   Encoders:
: [drm]     DFP2: INTERNAL_UNIPHY
: [drm] fb mappable at 0x80141000
: [drm] vram apper at 0x80000000
: [drm] size 9216000
: [drm] fb depth is 24
: [drm]    pitch is 7680
: Console: switching to colour frame buffer device 240x75
: fb0: radeondrmfb frame buffer device
: registered panic notifier
: [drm] Initialized radeon 2.2.0 20080528 for 0000:01:00.0 on minor 0