NUTMEG DP to VGA bridge not working

Submitted by Mandeep Singh Baines

Assigned to Default DRI bug account

Link to original bug (#42490)

Description

Created attachment 53026
dmesg log of radeon errors

I have an ASRock A75M motherboard with an A8-3850.

Booting a 3.1 kernel (also tried 3.06), my screen goes blank with modesetting enabled. If I disable modesetting, I am able to boot fine but then X won't work because the X11 driver requires modesetting.

Attachment 53026, "dmesg log of radeon errors":
examples.desktop

added Radeon bugzilla labels

Mandeep Singh Baines uploaded an attachment:

Attachment 53027, "vga bios":
radeon-bug.txt

Mandeep Singh Baines said:

Nov 01 12:06:55 [kernel] [ 1.445489] [drm] Initialized drm 1.1.0 20060810
Nov 01 12:06:55 [kernel] [ 1.445828] [drm] radeon defaulting to kernel modesetting.
Nov 01 12:06:55 [kernel] [ 1.445934] [drm] radeon kernel modesetting enabled.
Nov 01 12:06:55 [kernel] [ 1.446077] radeon 0000:00:01.0: PCI INT A -> GSI 18 (level, low) -> IRQ 18
Nov 01 12:06:55 [kernel] [ 1.446675] [drm] initializing kernel modesetting (SUMO 0x1002:0x9640 0x1849:0x9640).
Nov 01 12:06:55 [kernel] [ 1.446922] [drm] register mmio base: 0xFEF00000
Nov 01 12:06:55 [kernel] [ 1.447024] [drm] register mmio size: 262144
Nov 01 12:06:55 [kernel] [ 1.447234] ATOM BIOS: General
Nov 01 12:06:55 [kernel] [ 1.447361] radeon 0000:00:01.0: VRAM: 256M 0x0000000000000000 - 0x000000000FFFFFFF (256M used)
Nov 01 12:06:55 [kernel] [ 1.447538] radeon 0000:00:01.0: GTT: 512M 0x0000000010000000 - 0x000000002FFFFFFF
Nov 01 12:06:55 [kernel] [ 1.447719] mtrr: type mismatch for c0000000,10000000 old: write-back new: write-combining
Nov 01 12:06:55 [kernel] [ 1.447886] [drm] Detected VRAM RAM=256M, BAR=256M
Nov 01 12:06:55 [kernel] [ 1.447974] [drm] RAM width 32bits DDR
Nov 01 12:06:55 [kernel] [ 1.448195] [TTM] Zone kernel: Available graphics memory: 3950106 kiB.
Nov 01 12:06:55 [kernel] [ 1.448289] [TTM] Zone dma32: Available graphics memory: 2097152 kiB.
Nov 01 12:06:55 [kernel] [ 1.448379] [TTM] Initializing pool allocator.
Nov 01 12:06:55 [kernel] [ 1.448493] [drm] radeon: 256M of VRAM memory ready
Nov 01 12:06:55 [kernel] [ 1.448584] [drm] radeon: 512M of GTT memory ready.
Nov 01 12:06:55 [kernel] [ 1.448685] [drm] Supports vblank timestamp caching Rev 1 (10.10.2010).
Nov 01 12:06:55 [kernel] [ 1.448775] [drm] Driver supports precise vblank timestamp query.
Nov 01 12:06:55 [kernel] [ 1.448897] radeon 0000:00:01.0: radeon: using MSI.
Nov 01 12:06:55 [kernel] [ 1.449013] [drm] radeon: irq initialized.
Nov 01 12:06:55 [kernel] [ 1.449104] [drm] GART: num cpu pages 131072, num gpu pages 131072
Nov 01 12:06:55 [kernel] [ 1.450154] [drm] Loading SUMO Microcode
Nov 01 12:06:55 [kernel] [ 1.458789] radeon 0000:00:01.0: WB enabled
Nov 01 12:06:55 [kernel] [ 1.474954] [drm] ring test succeeded in 2 usecs
Nov 01 12:06:55 [kernel] [ 1.475122] [drm] radeon: ib pool ready.
Nov 01 12:06:55 [kernel] [ 1.475276] [drm] ib test succeeded in 0 usecs
Nov 01 12:06:55 [kernel] [ 1.477539] [drm] Radeon Display Connectors
Nov 01 12:06:55 [kernel] [ 1.477645] [drm] Connector 0:
Nov 01 12:06:55 [kernel] [ 1.477746] [drm] HDMI-A
Nov 01 12:06:55 [kernel] [ 1.477846] [drm] HPD2
Nov 01 12:06:55 [kernel] [ 1.477947] [drm] DDC: 0x6440 0x6440 0x6444 0x6444 0x6448 0x6448 0x644c 0x644c
Nov 01 12:06:55 [kernel] [ 1.478122] [drm] Encoders:
Nov 01 12:06:55 [kernel] [ 1.478223] [drm] DFP1: INTERNAL_UNIPHY2
Nov 01 12:06:55 [kernel] [ 1.478325] [drm] Connector 1:
Nov 01 12:06:55 [kernel] [ 1.478426] [drm] VGA
Nov 01 12:06:55 [kernel] [ 1.478525] [drm] HPD1
Nov 01 12:06:55 [kernel] [ 1.478626] [drm] DDC: 0x6430 0x6430 0x6434 0x6434 0x6438 0x6438 0x643c 0x643c
Nov 01 12:06:55 [kernel] [ 1.478779] [drm] Encoders:
Nov 01 12:06:55 [kernel] [ 1.478865] [drm] CRT1: INTERNAL_UNIPHY2
Nov 01 12:06:55 [kernel] [ 1.478953] [drm] CRT1: NUTMEG
Nov 01 12:06:55 [kernel] [ 1.956032] [drm] Radeon display connector HDMI-A-1: No monitor connected or invalid EDID
Nov 01 12:06:55 [kernel] [ 2.104068] Refined TSC clocksource calibration: 2894.735 MHz.
Nov 01 12:06:55 [kernel] [ 2.104443] Switching to clocksource tsc
Nov 01 12:06:55 [kernel] [ 2.436028] [drm] Radeon display connector VGA-1: No monitor connected or invalid EDID
Nov 01 12:06:55 [kernel] [ 2.441565] [drm] Internal thermal controller without fan control
Nov 01 12:06:55 [kernel] [ 2.442002] [drm] radeon: power management initialized
Nov 01 12:06:55 [kernel] [ 3.072510] [drm] fb mappable at 0xC0141000
Nov 01 12:06:55 [kernel] [ 3.072601] [drm] vram apper at 0xC0000000
Nov 01 12:06:55 [kernel] [ 3.072689] [drm] size 3145728
Nov 01 12:06:55 [kernel] [ 3.072775] [drm] fb depth is 24

Nov 01 12:06:55 [kernel] [ 3.072862] [drm] pitch is 4096
Nov 01 12:06:55 [kernel] [ 3.073325] fbcon: radeondrmfb (fb0) is primary device
Nov 01 12:06:55 [kernel] [ 8.100031] [drm:atom_op_jump] ERROR atombios stuck in loop for more than 5secs aborting
Nov 01 12:06:55 [kernel] [ 8.110377] [drm:radeon_dp_get_link_status] ERROR displayport link status failed
Nov 01 12:06:55 [kernel] [ 8.110381] [drm:radeon_dp_link_train_cr] ERROR clock recovery failed
Nov 01 12:06:55 [kernel] [ 8.129433] Console: switching to colour frame buffer device 128x48
Nov 01 12:06:55 [kernel] [ 8.135688] fb0: radeondrmfb frame buffer device
Nov 01 12:06:55 [kernel] [ 8.135690] drm: registered panic notifier
Nov 01 12:06:55 [kernel] [ 8.135695] [drm] Initialized radeon 2.10.0 20080528 for 0000:00:01.0 on minor 0

Alex Deucher @agd5f said:

Please attach your xorg log. Which connector(s) are you using?

Mandeep Singh Baines said:

The problem is happening right at boot. With DRM_RADEON_KMS enabled in my kernel config, the screen goes black immediately after exiting the bootloader. The machines is not wedged because <ctrl-alt-delete> still works.

If recompile with DRM_RADEON_KMS=n, the screen goes black (for longer than I'm used to) but then I see the kernel printks and then a login prompt. When I try to run X with xf86-video-ati I get an error message telling me that SUMO requires KMS. So I'm currently working around by running with the VESA X drivers.

This is a brand new machine which I just brought up yesterday. Windows seems to work fine so I don't think its a hardware issue.

The motherboard comes with a VGA and an HDMI connector. I'm currently using the VGA connector.

Mandeep Singh Baines said:

I probably should have assigned this to Product:DRI instead Product:xorg since the problem I'm seeing is in the kernel driver and not in the xorg driver.

Alex Deucher @agd5f said:

The DP to VGA bridge chips on a llano APUs are problematic in a lot of cases. You might try a newer kernel or use a digital port (HDMI, DP, DVI) in the meantime.

Mandeep Singh Baines said:

I've tried 3.0.6, 3.1 and the drm-core-next branch from: git://people.freedesktop.org/~airlied/linux

Is there a radeon linux kernel tree I could test? I'm also happy to test any patches against any tree.

I've ordered an HDMI-DVI cable so I'll give that a shot in a few days.

Alex Deucher @agd5f said:

(In reply to comment 7)

I've tried 3.0.6, 3.1 and the drm-core-next branch from:
git://people.freedesktop.org/~airlied/linux

Is there a radeon linux kernel tree I could test? I'm also happy to test any
patches against any tree.

You can try drm-fixes-staging, but I doubt you'll see any change. I'll be sure to update this bug as I make progress with the NUTMEG chip.

Mandeep Singh Baines said:

Tested with drm-fixes-staging. Same behavior.

Mandeep Singh Baines said:

Woot! HDMI works fine.

Alex Deucher @agd5f closed a related bug:

*** Bug 47064 has been marked as a duplicate of this bug. ***

Jeff Cook said:

Seeing this here on an Acer Aspire am3470g-uw10p with Radeon HD 6530D. The vga output dies as soon as radeon with KMS is loaded. In process of acquiring HDMI cable to test with HDMI output.

I have tried with 3.3.1 and 3.3.2 and same problem. Using xorg 1.12.1, xf86-video-ati 6.14.4, ati-dri/mesa 8.0.2 on brand new Arch Linux. Also tried Ubuntu 11.10 Live CD and same results.

Adding vga=775 radeon.modeset=0 to kernel boot line gives me a usable console interface and Xorg will actually start that way, but Xorg display is highly corrupted with bands of bright green and red lines.

Ubuntu 12.04 beta 2 gives same result except that it can successfully start a non-corrupted (but incorrect resolution) Xorg server with the kernel boot line above.

I have an identical snippet in my dmesg as the one posted by Mandeep Baines above.

This bug is marked fixed for Ubuntu in Launchpad ( https://bugs.launchpad.net/ubuntu/+source/linux/+bug/825777 ) but it doesn't work with a fully up-to-date Arch Linux. I haven't had occasion to try the specific Ubuntu kernel build (3.0.0-17.30) cited as resolving the problem (and it seems to be based on one positive result) and I don't seem to see a patch that would be applicable to a mainline kernel.

lspci:
VGA compatible controller: Advanced Micro Devices [AMD] nee ATI BeaverCreek [Radeon HD 6530D]

Jeff Cook said:

So it turns out the monitor didn't have an HDMI input.

The only way I could get it working without an HDMI-DVI cable was to downgrade to Xorg 1.11 and install Catalyst. I'm looking forward to the arrival of an HDMI-capable monitor at that station so I can test the open-source driver more thoroughly (get some quite annoying crashes with Catalyst).

Alex Deucher @agd5f submitted a patch:

This patch fixes things for me.

Patch 60707, "possible fix":
0001-drm-radeon-kms-need-to-set-up-ss-on-DP-bridges-as-we.patch

die..@..il.com said:

Doesn't change anything for me.
I tried patching a kernel 3.3.2 and a 3.4.0_rc4 ... should I try with a next-drm or drm-fixes-staging ?

Niels Ole Salscheider @olesalscheider said:

This does not fix the problem for me, either...

Niels Ole Salscheider @olesalscheider uploaded an attachment:

Attachment 60730, "dmesg with proposed patch and drm.debug=4":
dmesg.log

Alex Deucher @agd5f said:

(In reply to comment 16)

This does not fix the problem for me, either...

(In reply to comment 17)
> Created attachment 60730 [details]
> dmesg with proposed patch and drm.debug=4

Your system doesn't use a NUTMEG chip. It uses TRAVIS for both VGA and LVDS. Please attach a copy of your vbios:

(as root)
(use lspci to get the bus id)
cd /sys/bus/pci/devices/``
echo 1 > rom
cat rom > /tmp/vbios.rom
echo 0 > rom

die..@..il.com uploaded an attachment:

Mine is and the patch doesn't correct the problem.

(please ignore the nouveau stuff this is because I want a dual screen so I put a second card in the machine if not for this problem with the VGA I wouldn't have it)

Attachment 60758, "dmesg with proposed patch and drm.debug=4":
dmesg-3.3.1_patch.log