(Resending to dri-devel because the first one didn't make it). 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 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@xxxxxxxxxx GnuPG FP : 11ACBA4F 4778E3F6 E4EDF38E B27B944E 34884E85
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