On Sun, Nov 3, 2013 at 4:41 AM, Robin H. Johnson robbat2@gentoo.org wrote:

I apologize for not sending this sooner, but I wanted to be really sure that I wasn't introducing the bug elsewhere, and I was lacking time to even narrow it down this far.

TL;DR: 3.11 kernel does proper modeset for dual 1920x1200 outputs 3.12-rc5/rc7 kernel fails to do proper modeset, blank screen after radeon loaded

Can you bisect?

Alex

Symptoms:

• With implicit video= modes, after the radeon module loads, both monitors just go blank. Kernel message: radeon 0000:01:00.0: No connectors reported connected with modes X does not visible start, screen stays black.
• With explicit video= modes, after the radeon module loads, both monitors during the kernel boot display very garbled output; after X starts, they are in 1024x768, with no higher modes listed.

Attached are four dmesg [1] runs, on v3.11 vs v3.12-rc7, with both explicit video parameters, and implicit video parameters; as well as drm.debug=0x06 in ALL cases; as well as two xorg logs (both from the implicit variants).

testcase 1 (implicit): modeset=1 fbcon=map:0 drm.debug=0x06 testcase 2 (explicit): video=HDMI-A-1:1920x1200e video=DVI-I-1:1920x1200e modeset=1 fbcon=map:0 drm.debug=0x06

I have produced this bug with three different cards: CEDAR 0x1002:0x68F9 0x1043:0x03CA (used for all these bug reports) CEDAR 0x1002:0x68F9 0x174B:0xE164 TAHITI 0x1002:0x6798 0x1458:0x2261 (7970, borrowed before)

This happened as far back as 3.12-rc5 for me, but I didn't debug more at the time.

Monitors: (Left) Dell U2410 via DVI (Center) Dell U2413 via HDMI (Right is another U2410, not connected at all)

Userspace: xorg-server-1.14.3 mesa-9.2.1 xf86-video-ati-7.2.0

I think the error might be and off by one in the connector probing, based on this:

3.11: [drm:drm_helper_probe_single_connector_modes], [CONNECTOR:15:HDMI-A-1] [drm:radeon_atombios_connected_scratch_regs], DFP1 connected [drm:drm_helper_probe_single_connector_modes], [CONNECTOR:15:HDMI-A-1] probed modes :

3.12-rc7: [drm:drm_helper_probe_single_connector_modes], [CONNECTOR:16:HDMI-A-1] [drm:radeon_process_i2c_ch], hw_i2c error [drm:radeon_atombios_connected_scratch_regs], DFP1 disconnected [drm:drm_helper_probe_single_connector_modes], [CONNECTOR:16:HDMI-A-1] disconnected

[1] yes I know about the bonding error, that's a separate issue I need to mail to LKML/netdev.

-- Robin Hugh Johnson Gentoo Linux: Developer, Trustee & Infrastructure Lead E-Mail : robbat2@gentoo.org GnuPG FP : 11ACBA4F 4778E3F6 E4EDF38E B27B944E 34884E85

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